Wheatstone Corporation AM-10HD Technical Manual Download

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AM-10HD / Aug 2008

S C H E M A T I C D R A W I N G S

I/O Schematic Drawings &

Load Sheet

Chapter Contents

AM-10HD Signal Flow Diagram .................................................... 4-2

Audio Processor (AM-10HD)

Schematic ................................................................................................................. 4-3

Load Sheet ................................................................................................................ 4-8

Summary of Contents for AM-10HD

Page 1: ...Digital Audio Processor AM 10hd Technical Manual Wheatstone Corporation August 2008 ...

Page 2: ...08 Ultra High Resolution Processing ORSIS 600 Industrial Drive New Bern North Carolina 28562 tel 252 638 7000 fax 252 637 1285 AM 10HD Digital Audio Processor Technical Manual 1st Edition 2008 Wheatstone Corporation ...

Page 3: ...ct In a domestic environment this This is a Class A product In a domestic environment this This is a Class A product In a domestic environment this This is a Class A product In a domestic environment this product may cause radio interference in which case the product may cause radio interference in which case the product may cause radio interference in which case the product may cause radio interf...

Page 4: ... later at the 2008 NAB Show Vorsis again surprised the broadcast industry with the introduction of five new audio processing products AP 2000 and FM 2000 successors to the well received AP 1000 introduced just two years earlier the AP 2000 is targeted for stations needing the power of its dual 31 band FM and HD limiters while the FM 2000 has all the features of the AP 2000 except the HD signal pat...

Page 5: ...g 1 6 I O Connections 1 7 Audio Inputs 1 7 Analog In 1 7 AES In 1 7 Audio Outputs 1 8 AM Path 1 8 HD Path 1 8 Analog Out 1 8 AES Out 1 8 Headphones 1 8 Network Connection 1 9 Ethernet RJ 45 1 9 Typical Ethernet Cable 1 9 Typical Crossover Cable 1 9 General Purpose Interface GPI GPO 1 10 GPI 1 10 User Presets 1 11 Example Schematic of General Purpose Inputs 1 12 GPO 1 13 Analog XLR Connections Pino...

Page 6: ...our Short Term Goal 2 13 How Do I Make It Louder 2 14 What Is Your Long Term Goal 2 14 Clean and Loud 2 15 Can I Generate That Sixties Compression Sound 2 16 The AM 10HD Factory Presets 2 17 Future Presets and Preset Updates 2 17 Architecture of the AM 10HD GUI 3 5 Network Configuration 3 5 Getting Started 3 6 Connecting the AM 10HD and the GUI 3 6 Using a LAN Connection 3 6 Configuring the AM 10H...

Page 7: ...2 HPF High Pass Filter 3 23 Why the Sum and Difference High Pass Filter Option 3 23 Parametric Equalizer Menu 3 24 Enable 3 25 Automatic Gain Control and Compressor Menu 3 26 Drive 3 26 Makeup 3 26 AGC Comp Buttons 3 27 Gated Modes 3 28 Ooze 3 28 Hold 3 28 Gate Delay 3 28 Gate Threshold 3 29 Band Coupling 3 29 AGC Backoff 3 30 Crossover Frequencies 3 31 Selecting Crossover Frequencies 3 31 AGC Com...

Page 8: ...rols 3 47 Limiter Enable 3 47 L R Linked 3 47 Limiter Thresh 3 47 Attack 3 47 Release 3 47 Delayed Release 3 48 Clip Style Main Clipper 3 48 AM Diversity Delay 3 49 Entering Delay Values 3 49 10 Band Limiter Dynamics Screens 3 50 Limiter Threshold Screen 3 50 Clipper Threshold Screen 3 51 Attack Time Screen 3 52 Release Time Screen 3 53 Final Equalization Screen 3 54 AM Transmission Menu 3 55 Test...

Page 9: ...ar Region 3 72 Presets 3 72 Save 3 72 Library 3 73 Locking Presets 3 74 Devices 3 75 Quick Save QSave 3 75 Title Bar Region 3 77 Status 3 77 Devices 3 77 Presets 3 78 Notes on Online and Offline working 3 78 Accessing Menu Options 3 79 File Menu Items 3 79 Hardware Menu Items 3 79 AM 10HD Hardware Update 3 80 Presets Menu Items 3 81 AM 10HD Signal Flow Diagram 4 2 Audio Processor AM 10HD Schematic...

Page 10: ...onnections 1 7 Audio Inputs 1 7 Analog In 1 7 AES In 1 7 Audio Outputs 1 8 AM Path 1 8 HD Path 1 8 Analog Out 1 8 AES Out 1 8 Headphones 1 8 Network Connection 1 9 Ethernet RJ 45 1 9 Typical Ethernet Cable 1 9 Typical Crossover Cable 1 9 General Purpose Interface GPI GPO 1 10 GPI 1 10 User Presets 1 11 Example Schematic of General Purpose Inputs 1 12 GPO 1 13 Analog XLR Connections Pinouts Drawing...

Page 11: ...thing is brought out to the end user The AM 10HD provides the power and the tools required to design the just right sound If you can think of the on air sound you want your station to have the AM 10HD can create it for you This extreme flexibility is made possible by our entirely new approach to both the user interface and clever new DSP audio processing algorithms The AM 10HD has the clarity powe...

Page 12: ...an in 1975 as the Audioarts company By 1976 its product line had already grown to include high quality audio equalizers electronic crossovers and specialized compressor limiters In 1977 its first audio mixing control console was introduced Wheatstone returned to its audio processing roots in 2005 when it created the line of signal processing products and introduced the AP3 Digital Signal Processor...

Page 13: ...M audio processors on the market today The 10 band limiter is equipped with fully adjustable thresholds and attack and release times for each of the bands Because the AM 10HD s limiter operates with precision time aligned bandpass filters regardless of its configuration due to reduced bandwidth its dynamic operation is nearly invisible to the ear The resulting on air sound can be carefully tailore...

Page 14: ...cing is required it should be made with shielded two conductor cable such as Belden 8451 or 9451 as if connect ing a balanced source At the unbalanced source s output connect the Output to the HI input wire and connect the source GND wire to the LO wire Connect the shield at the AM 10HD end only noting that in some instances this connection may need to be made through a 0 01uF capacitor in order t...

Page 15: ...s are being sent the AM 10HD is switched to a bypass or special preset mode This can be accomplished by using the AM 10HD s GPI interface and by assigning a special preset to the EAS function that has internal processing defeated and audio levels calibrated to provide proper modulation levels during EAS transmissions Arbitron People Meter The AM 10HD favorably passes the data watermarking scheme u...

Page 16: ...ied to either the analog left right inputs or to anAES3 digital input The AES3 input accepts sample rates between 32 kHz and 96 kHz Automatic audio failover from one input to the other is a user selectable option Failover from AES3 to analog is instantaneous and based on invalid or missing bits in the AES3 stream or after 30 seconds of silence level below 48dBFS Failover from analog toAES3 is base...

Page 17: ...LINE AM RT OUT LO Pin 1 XLR HD LT SH LINE HD LT OUT SH Pin 2 XLR HD LT HI LINE HD LT OUT HI Pin 3 XLR HD LT LO LINE HD LT OUT LO Pin 1 XLR HD RT SH LINE HD RT OUT SH Pin 2 XLR HD RT HI LINE HD RT OUT HI Pin 3 XLR HD RT LO LINE HD RT OUT LO AES Out XLR M Pin 1 XLR AM SH AES AM OUT SH Pin 2 XLR AM HI AES AM OUT HI Pin 3 XLR AM LO AES AM OUT LO Pin 1 XLR HD SH AES HD OUT SH Pin 2 XLR HD HI AES HD OUT...

Page 18: ...ou are connecting directly between the computer and the AM 10HD with no network in between it is normal to use a crossover cable Ethernet RJ 45 Pin 1 TXD Pin 2 TXD Pin 3 RXD Pin 4 N C Pin 5 N C Pin 6 RXD Pin 7 N C Pin 8 N C Typical Ethernet Cable Typical Crossover Cable 1 2 3 4 TXD TXD RXD RXD PIN 1 2 3 4 PIN RJ 45 Plug RJ 45 Plug White Orange 5 6 7 8 N C N C 5 6 7 8 Orange White Green Blue White ...

Page 19: ...I 4 IN Pin 8 GPI 5 IN Pin 4 GPI 6 IN Pin 9 GPI 7 IN Pin 5 GPI 8 IN The GPI input circuits are optoisolated by devices having an input output isolationof1 500VAC TheseinputswillworkverywellinhighRFenvironments and will not cause ground loop issues when connected to external equipment Each of the GPI inputs is current limited by a 475 ohm resistance located inside theAM 10HD s GPI control circuitry ...

Page 20: ... with a factory preset that has the on air sound closest to what you need and then make any necessary changes to that preset to get to your final sound NOTE User presets stored in locations 1 through 8 are logically assigned to the remote GPI function One example of a type of preset that might be stored here is a preset that has all processing turned off and has special input output level calibrat...

Page 21: ...page 1 12 AM 10HD Aug 2008 G E N E R A L I N F O R M A T I O N Example Schematic of General Purpose Inputs ...

Page 22: ...eturn Because of this each GPO may be used in any way desired without concern of cross coupling between unrelated external circuits The optoisolators on the GPO are rated at a maximum of 350 Volts AC or DC and with a maximum load current of 100mA Because of the AC rating external circuit polarity is unimportant and therefore we will simply define the GPO pins as Source and Return The pin assignmen...

Page 23: ...M LT SH LINE AM LT OUT SH PIN 2 XLR AM LT HI LINE AM LT OUT HI PIN 3 XLR AM LT LO LINE AM LT OUT LO XLR AM LT M PIN 1 XLR AM RT SH LINE AM RT OUT SH PIN 2 XLR AM RT HI LINE AM RT OUT HI PIN 3 XLR AM RT LO LINE AM RT OUT LO XLR AM RT M 1 2 3 Analog XLR Connections 1 2 3 PIN 1 XLR HD LT SH LINE HD LT OUT SH PIN 2 XLR HD LT HI LINE HD LT OUT HI PIN 3 XLR HD LT LO LINE HD LT OUT LO XLR HD LT M PIN 1 X...

Page 24: ... SH PIN 2 XLR HI AES IN HI PIN 3 XLR LO AES IN LO XLR F Digital XLR Connections 1 2 3 PIN 1 XLR AM SH AES AM OUT SH PIN 2 XLR AM HI AES AM OUT HI PIN 3 XLR AM LO AES AM OUT LO XLR AM M PIN 1 XLR HD SH AES HD OUT SH PIN 2 XLR HD HI AES HD OUT HI PIN 3 XLR HD LO AES HD OUT LO XLR HD M 1 2 3 AES Out XLR M ...

Page 25: ... 8 TXD TXD RXD RXD N C N C N C N C General Purpose Interface DB 9 GPI 7 IN GPI 5 IN GPI 1 IN GPI 8 IN GPI 6 IN GPI 4 IN GPI 2 IN GPI COM GPI 3 IN GPI DB 9 GPO 4 OUT SOURCE GPO 3 OUT SOURCE GPO 1 OUT SOURCE GPO 4 OUT RETURN GPO 3 OUT RETURN GPO 2 OUT RETURN GPO 1 OUT RETURN N C GPO 2 OUT SOURCE GPO DB 9 ...

Page 26: ... TCP IP Address 2 6 Configuring the AM 10HD 2 7 Configuring the GUI 2 8 Additional Notes on AM 10HD GUI Connectivity 2 9 A Known Windows Networking Issue 2 10 Achieving Your Special On Air Sound 2 12 First a Few Words About Our Factory Presets 2 12 What Sound Are You Trying to Achieve 2 12 About Bass 2 13 Is There a Caveat 2 13 What Is Your Short Term Goal 2 13 How Do I Make It Louder 2 14 What Is...

Page 27: ...ead the whole manual Please check out the various chapters of the AM 10HD Operating Guide if you need some ad ditional information If for some reason you find that you re really stuck you can always call our friendly technical support folks at 252 638 7000 Pleaseinspectthecontentsofthepackagetoensurethatthefollowingitemsarepresent Wheatstone AM 10HD Unit Quantity 1 AM 10HD GUI Software CD Quantity...

Page 28: ...e GUI or on the front panel adjust the Input Gain control AES or Analog as required until the input meters are peaking around 12dBFS with normal program levels being applied Note that for best overall performance of the entire audio chain as a sys tem the Input gain of theAM 10HD should be calibrated so that it reaches 0dBFS when the signal chain prior to the AM 10HD also reaches 0dBFS or digital ...

Page 29: ...ul to double click the delay value window which opens it where you can manually type in any value of delay required You re now on the air We ship every AM 10HD with the Quick Start preset as the factory default preset 10 This preset provides moderate competitiveness and well balanced sound and is a good starting point for a variety of program formats It s good to remember that our preset names don...

Page 30: ...kpushbuttonlocateddirectlybelowtherotaryencoder These controls are assigned to the following functions Unlocking the Front Panel The factory default passcode is 0000 To unlock the front panel press in and hold the encoder wheel until the Pass 0000 prompt appears the first two zeroes will be flashing Press the encoder wheel to lock these digits in placeandmovethecursortothesecondpairofdigits When t...

Page 31: ...n double click it When the contents of the CDROM drive appear in the window locate the AM 10HDGUISetup_x_x_x exe file where x_x_x is the version number on the CDROM and double click it Follow the on screen instructions to complete the GUI installation Configuring the AM 10HD TCP IP Address There are a few network parameters that the AM 10HD and its GUI must have in common so that they can communic...

Page 32: ...ecausetheGUIwill send the IP address information to the hardware device that owns the MAC address that was entered in this step If the MAC address is incorrect theAM 10HD will never hear it Next enter a pet name for your AM 10HD like WXYZ etc Then enter the IP address that you wish the AM 10HD to have noting that this address must be unique if theAM 10HD will be communicating over your network Nex...

Page 33: ... the configuration of existing ones modified First enter the same pet name that you used when you assigned the IP address to the AM 10HD Next enter the IP address that you configured the AM 10HD for in the previous steps Note that just to be surethedatayouenteristheonlydatathathasbeenentered and there are no invisible blank spaces it is always best to completely delete any existing data in the IP ...

Page 34: ... 168 1 254 noting of course that the AM 10HD and GUI PC cannot share the same IP address Additional Notes on AM 10HD GUI Connectivity The AM 10HD uses both TCP port 55895 and the first available UDP port in the range of 60001 to 60010 during communications sessions TCP is used for controlling the AM 10HD because TCP works to repair any transmission errors that need to be corrected This ensures tha...

Page 35: ...HD with the GUI In most cases this is due to old data being in the PC s ARP Address Resolution Protocol cache the first place Windows looks for how to connect to a networked device The ARP cache can be cleared manually at a command line but it s much easier done using the built in tools within Windows To do this open the Windows Network Connections dialog Next highlight the Local Area Connection a...

Page 36: ...oes is reset the PC s Ethernet interface in essence refreshing it During this process the following six messages will go by This process usually completes in a few seconds and when it does the network connection should be fully functional If it still does not work then some friendly assistance from your local IT guru might be required ...

Page 37: ...ne this is not a trivial number What we do at Wheatstone to help mitigate this is spend a lot of time liter ally thousands of hours carefully crafting factory presets that will get you closer to your desired on air sound quicker than if you had to build them from scratch We do our best to provide a lot of good starting points in our factory presets and we re always learning which is why you ll per...

Page 38: ...ll percent age of the station s audience can result in reduced loudness and or higher distortion for the majority of the station s listeners Over boosted bass while also taxing the transmitter s modulator and power supply harder can cause increased intermodula tion distortion in a consumer s receiver On the other hand over boosted high end can tax components in the transmitter s RF output network ...

Page 39: ...e extra loudness and carries with it the risk of driving away your long term listeners because the audio is just too dense Be careful What Is Your Long Term Goal What Is Your Long Term Goal If the long term goal isn t to be the loudest AM radio station on the planet you can still be competitively loud and also sound better cleaner brighter and punchier than other stations in the market Whenloudnes...

Page 40: ...ve a bit of muddy sound in this region Use the parametric equalizer either pre or post AGC and set it for EQ Frequency of 200Hz EQ cut of about 3dB EQ Bandwidth of about 0 2 octaves Theabovecombinationwillsomewhat relax thesoundbecausetheAGCsections are operating slower slightly lowering their average output levels and also because of the slightly reduced levels in the ear s most sensitive region ...

Page 41: ...far negative theAGC will provide a platform that the compressor can work against preventing rapid suck up of background noise that might be undesirable A word of caution if you re also using reverb to augment that sixties sound with faster and deeper compression reverb tails will become exaggerated This ar tifact can be reduced in several ways Reduce the amount of reverb Operate the AGC Backoff co...

Page 42: ... and in your market and then if need be add your own personalized touches to make it exactly what you feel you need Future Presets and Preset Updates From time to time we offer new presets for download on the Wheatstone Processing website that were either created by the our development team or were contributed by our loyal customers These presets are downloadable as Preset Packages and each will h...

Page 43: ...The Really Remote Connection 3 11 VPN 3 11 The AM 10HD and Internet Security Concerns 3 11 About DHCP and the AM 10HD 3 11 About Ports and the AM 10HD 3 12 Using the AM 10HD GUI 3 13 Dynamic Displays Region 3 14 Frequency Domain Graph 3 14 AM 10HD Graphical Interface Operation 3 15 First a short tutorial 3 16 Bargraph Metering 3 17 Input Levels Gain Reduction Meter 3 18 Output Meter 3 18 60dB Rang...

Page 44: ...nd Compressor Menu 3 26 Drive 3 26 Makeup 3 26 AGC Comp Buttons 3 27 Gated Modes 3 28 Ooze 3 28 Hold 3 28 Gate Delay 3 28 Gate Threshold 3 29 Band Coupling 3 29 AGC Backoff 3 30 Crossover Frequencies 3 31 Selecting Crossover Frequencies 3 31 AGC Compressor Gain Reduction 3 32 HD Output Menu 3 33 Source 3 33 Bandwidth 3 33 HF Protect and HyperMono 3 33 HF Protect 3 34 Ceiling 3 34 Recovery 3 34 Hyp...

Page 45: ... AM Limiter Controls 3 47 Limiter Enable 3 47 L R Linked 3 47 Limiter Thresh 3 47 Attack 3 47 Release 3 47 Delayed Release 3 48 Clip Style Main Clipper 3 48 AM Diversity Delay 3 49 Entering Delay Values 3 49 10 Band Limiter Dynamics Screens 3 50 Limiter Threshold Screen 3 50 Clipper Threshold Screen 3 51 Attack Time Screen 3 52 Release Time Screen 3 53 Final Equalization Screen 3 54 AM Transmissio...

Page 46: ... 3 69 Creating a Weekly Rotation Event 3 70 Creating a Long Term Rotation Event 3 70 Deleting a Scheduled Event 3 71 Set Time 3 71 Side Bar Region 3 72 Presets 3 72 Save 3 72 Library 3 73 Locking Presets 3 74 Devices 3 75 Quick Save QSave 3 75 Title Bar Region 3 77 Status 3 77 Devices 3 77 Presets 3 78 Notes on Online and Offline working 3 78 Accessing Menu Options 3 79 File Menu Items 3 79 Hardwa...

Page 47: ...t parameters never more than two mouse clicks away This is a radical change from competing products where constant navigation through numerous layers of menus and screens is required Network Configuration AM 10HD GUI The AM 10HD GUI PC software allows you to control any number of AM 10HD s via a standard Ethernet local area network LAN Utilizing TCP and UDP protocols the GUI can control AM 10HD de...

Page 48: ...nection The AM 10HD and the PC running the AM 10HD GUI program can be straightforwardly connected together over a standard Ethernet Local Area Net work LAN The AM 10HD should be installed powered up and verified to be operating normally A CAT5 Ethernet cable connected to the 100baseT LAN should be inserted into the appropriate socket on the rear of the AM 10HD Likewise the GUI should be installed ...

Page 49: ...e AM 10HD does not conflict with the address of any other device on the network Please consult your friendly IT manager if necessary Next enter a pet name for your AM 10HD like WABC etc Then enter the IP address that you wish the AM 10HD to have noting that this address must be unique if the AM 10HD will be communicating over your network Next enter the desired Subnet Mask and Gateway IP addresses...

Page 50: ... adding devices to the list of AM 10HD s that the GUI knows about To do this locate and click on the Devices button that is located along the right side of the GUI When this is done the following window will pop up This box is used for adding new devices or modifying the configuration of existing ones Next click the Add button and the Edit Device dialog box will appear Devices Button ...

Page 51: ...evice that you just added and click on Select This step tells the GUI specifically which AM 10HD you want to connect to Next click on the Online Offline button just to the left of the Status indicator In the Status window you may see the message Trying as the GUI is handshaking with the AM 10HD Once the handshake is complete and communication protocols are locked in the Status message should rever...

Page 52: ... least 1GHz in speed running Windows 2000 or Windows XP and the screen resolution should be at least 1024 x 768 pixels in order to get the full benefit of the high resolution graphics utilized There should be at least 15MB of free space on the hard drive for the GUI software and presets and the PC s LAN interface NIC should be 100baseT 100MHz capable for best performance Wireless Connection Many u...

Page 53: ...els can be configured both with and without data en cryption Setting up a VPN is not difficult but certainly beyond the scope of this manual Although we have not specifically tested the AM 10HD with VPN connec tions there is no technical reason why it would not work The AM 10HD and Internet Security Concerns The AM 10HD does not act as a web device or web server nor does it sup port open ports to ...

Page 54: ...n to stream meter data over that UDP port back to the GUI Note If there are two or more GUIs attached to the AM 10HD then the AM 10HD will stream the meter data twice once for each of the opened port s to the connected GUIs If the GUI fails to open any of the 10 UDP ports it will still run and be able to control the AM 10HD via the TCP port but it will not receive any meter data to display Therefo...

Page 55: ...imized on the desktop taken off the screen and or closed by way of the familiar controls at the extreme top right Descriptions of the features and functions of the GUI will follow different discrete regions of the screen it will begin with the most eye catching region the Dynamic Displays and then we ll explain the Control Area above it followed by the Side Bar buttons and lastly the Title Bar TIT...

Page 56: ...l axis scale changes according to its context however the overall vertical range remains at 30dB with gradations every 3dB Anumberofreal timedynamicallyvaryingspectraandotherfrequency response versus time data may be observed simultaneously A row of large buttons under the graph determines what data is displayed and there are also buttons to enable disable the display of equalizer frequency respon...

Page 57: ...icking a dot to highlight it to turn it orange and then dragging it with the mouse various operating parameters for each band can be customized There are other ways to set parameters too In fact all of the controls on the graphical screen work the same way regardless of which processing section owns them Parameters within each of the processing sections can be accessed by clicking on the associate...

Page 58: ... and selecting Group All Adjusters removes all highlighted dots turning all orange dots back to blue Conversely right clicking and selecting UnGroup All Adjusters turns all remaining blue points orange meaning they can now each be individually adjusted The Flatten function although next in the list is best explained last Okay highlight a single dot again any dot will do Then right click the graphi...

Page 59: ...oportional Drag Allows the dragging of dots to create slopes Flat Drag Allows the dragging of dots together in a flat orientation Bargraph Metering Adjacent to the graph to the left and right and sharing a 30dB vertical range 0 30dB of gain reduction 30dB signal level meter range are a group of vertical bargraph level indicators for signal levels and gain reduction The level meters are peak over a...

Page 60: ...ynamic range such as live classical music Display Signal Selection Beneath the graph area are two large buttons Input and PreDelay By single clicking on a button a green indicator on the button will light to indicate which signal is being viewed on the large graphical display above it Input Pressing this button enables a Fast Fourier Transform FFT based real time spectral analysis of the selected ...

Page 61: ...ity delay Gain Reduction When this box is checked the graphical display includes information related to the amount of gain reduction occurring in the AGC and compressor The Blue line indicates long term AGC activity while the Yellow line indicates the shorter term compression Controls When this box is checked and if there are controls available for the page being viewed they will be shown as blue ...

Page 62: ...solution of the control variation can be increased made finer by hold ing down the keyboard s Ctrl key while adjusting the control as above or In most cases you can double click on the text that indicates the setting value for example the window that reads X XdB under the Line Gain knob on the Input Section and a box will pop up where you can enter an exact value and click OK From left to right ac...

Page 63: ...r lights if there is a signal present at the analog input that exceeds the threshold of 48dBFS The AES indicator lights if there is a valid AES signal present at the digital input that is above 48dBFS Input Failsafe In the event the currently selected input source fails and the Failsafe check box is checked an alternate source of audio connected to the other input can automati cally be put on the ...

Page 64: ...e asymmetrical peaks by phase shifting the signal harmonics relative to their fundamentals This reduces the peak to average ratio and enables an increase in apparent loudness with minimal audible detriment Processing the audio is greatly simplified if the waveforms are symmetrical Ordinarily human voice looks like the waveform below Notice how the width and amplitude of the upper and lower signal ...

Page 65: ...eckbox is checked then the mode is Off if the High Pass Filter checkbox is not checked or Stereo if High Pass Filter is checked If the Stereo checkbox is not checked then the mode is Off if both High Pass Filter checkboxes are unchecked or Sum Diff if either or both High Pass Filter checkbox is checked Why the Sum and Difference High Pass Filter Option In most program material there is little very...

Page 66: ...sition is different When the parametric equalizer is used ahead of the multiband AGC the equalization curves pre load the AGC drive to make it operate in a frequency conscious way Be aware however that EQ changes made to the audio even dramatic changes might be reduced when the audio goes through the multi band compressor especially when operating with ratios greater than about 4 1 The controls of...

Page 67: ...as adjusts the curve s height above or below the 0dB reference line up or down move Clicking on the little tent shaped symbol underneath and holding the left mouse button down and sliding the mouse left or right allows you to change the bandwidth or Q of the equalizer section Right clicking on the graphic opens a window for manual selection of which curve is to be manipulated with the mouse Enable...

Page 68: ... be achieved Driving harder higher numbers results in a more consistent on air sound with an increased capability to pull up low passages in program material Less drive creates a more gentle on air sound and has less capability to bring up low passages The Drive control simultaneously adjusts the sum and difference channels The range of this control is from 79 0dB to 6 0dB or OFF when fully down N...

Page 69: ...is in the audio path Comp Button When illuminated by clicking on it indicates that the output of the Compressor section is in the audio path CompressorOut AGCOut WhenbothAGCandCompressorareswitched off signal is being bypassed around the Compressor and AGC sections with no gain control being performed Compressor In AGC Out Signal is being routed through the Compres sor only which operates with rel...

Page 70: ...ly increase background noise Note that the time between reaching the AGC Gate Threshold and the instant when actual gain Hold begins is determined by the setting of the Gate Delay control Gate Delay The Gate Delay control sets how long the gating circuit waits after the signal has fallen below the Gate Threshold before it modifies the release time according to the Gated Mode setting The Gate Delay...

Page 71: ...han band 3 which is still set at the 0 reference line This will cause band 1 to need a higher audio level before it will un gate and allow the gain to increase Setting the gate this way pre vents unnatural increases in low frequency gain that might be undesirable The Gate Thresholds may be offset this way in any of the bands as the application warrants Band Coupling The Coupling control has one sp...

Page 72: ...e AGC Backoff The AGC Backoff control does two things 1 It adjusts the processing balance between slower AGC action and faster compression 2 It enables the sum and difference gains to be different if program content allows it With the Backoff control set at 0dB the audio gain control is primarily due to slowerAGCaction andthereforeshorttermprogramdynamicsarelargelyunaffected unless they exceed the...

Page 73: ...encies between 817Hz and 1 59kHz may be selected The High Mid to High band crossover frequency is selected using the blue list box Frequencies between 2 52kHz and 5 99kHz may be selected Selecting Crossover Frequencies The selection of crossover frequencies plays an important role in determin ing how an audio processor sounds with different types of program material and therefore the crossover fre...

Page 74: ...bove graphic the meter pair above the radio button with Context listed in it is displaying total gain reduction of the five band AGC in the left meter and total gain control generated by the five band Compressors in the right hand meter Mute When checked the band output is turned off This is useful when you want to hear what one or more bands are doing and allows the dynamic action of bands that a...

Page 75: ...five band AGC Compressor no AM pre emphasis has been applied yet so no de emphasis is necessary nor applied Bandwidth Sets the maximum bandwidth of the HD channel s audio path The US iBiquity AM HD system typically specifies an HD AM audio bandwidth of 15kHz Other applications may use the other settings and therefore we have provided bandwidth selections for 4kHz through 16kHz in 1kHz steps plus a...

Page 76: ...ponse that has been set by the Bandwidth control explained above The Recovery control adjusts how fast this action takes place Faster settings cause opera tion to be restored more quickly while slower settings do the reverse Settings that are too slow can cause the audio to seem to dull when it shouldn t be The setting is adjustable from 33 0 mSec to 330 0 mSec HyperMono Occasionally the incoming ...

Page 77: ...itigate processing artifacts that would detract from the otherwise pristine sound of the HD signal path The HD output is peak controlled by a special high speed feed forward limiter with a 0 5 millisecond lookahead time The control path and not the audio path is oversampled in order to achieve extremely precise peak control Because the goal of oversampling is better peak control through finer defi...

Page 78: ...the onset of limiting is reached with normal program material as indicated by the HD gain reduction bargraph Adjustable over a 6dB range Attack Adjusts the attack time of the lookahead limiter Attack times from 0 2 milliseconds through 0 5 milliseconds allow the limiter to lookahead in time and react to signal peaks before they arrive at the limiter s gain control algorithm Attack time settings gr...

Page 79: ... output is being used with a codec Did we say that we recommend this setting be used if the HD output is being used with a codec Round The Round style transfer function allows progressively higher ratios spread over a 3dB transition region This clipper style adds a round ness to the audio without sounding overly harsh because the higher order harmonics especially those above the 7th are reduced De...

Page 80: ...over the range of 36 00dB to 0 00dB in 0 05dB steps After the signal has been processed by the HD Limiter it is possible to perform some subtle equalization to do final sound shaping on the signal Note that more than one or two dB of equalization here boost OR cut can upset the precision of peak control generated by the preceding peak limiter Fortunately only very small amounts of equalization cha...

Page 81: ...en band limiter algorithm is especially suited for controlling peak energy without generating any of the unnatural artifacts that outdated and more simplistic algorithms with fewer bands generate There is no caveat for using the 10 band limiter other than it is probably inap propriate for most program material to drive the limiters above 10dB of limiting on a continuous basis Our recommendation is...

Page 82: ... dB Drive but instead in percent With sane settings of the five band Makeup control the 10 band limiter Drive control will usually be found between 85 and 100 Full adjustment range is 0 to 100 Higher Drive settings cause deeper gain reduction in the 10 band limiter as well as higher levels of clipping in the main clipper algorithm Therefore the Multiband Drive control is one of the most powerful c...

Page 83: ...o slightlyincreaseoveranadditional3dBwindowuntiltheultimatelimitthreshold is reached whereupon no further amplitude increase is permitted Because of its behavior the sound of the Soft function is less obvious and has a spongy sound when in operation It is also less precise as a true limiter until the ultimate limit threshold the setting of the band threshold is finally reached We veprovidedthe sof...

Page 84: ...l for formats that are less competitive and or where the ten band limiters can be operated with short 10mS attack times without causing excessive distortion in the main clipper ClipOnly Thismodeallowsthe10 banddistortionmaskedclipperstooper ate on their own and without the 10 band limiters This can be an extremely transparent and loud mode of operation of the 10 band section but it also requires t...

Page 85: ...pecial DSPalgorithms to allow bass punch to be set for any type of program material It offers two styles plus an OFF setting which when selected bypasses the VBMS algorithm altogether The VBMS offers a visual indication of its operation and it can be viewed in the 10 band limiter graphic as a solid yellow line extending from the VBMS Frequency turnover setting downward to 20Hz similar to that show...

Page 86: ...monic The two modes may appear on the surface to be almost identical because of the small amount of difference in their transfer functions However because of the amount of program energy being handled and because the transition slope is larger on the Soft setting there is a significant difference in the way the two clipper styles sound on actual program material VBMS Output Adjusts the ratio of ba...

Page 87: ...phic on the right When pre emphasis is enabled it may be placed in one of three locations in the signal chain Pre MBLim In this position the selected pre emphasis is placed before the 10 band limiter clipper section In this mode the 10 band section may be operated as a frequency conscious limiter tailored to the inverse of the selected pre emphasis Pre Limiter In this position the pre emphasis is ...

Page 88: ...ntrol sidechain is achieving bet ter peak control through finer definition of the audio waveform Therefore oversampling of the audio signal itself is not only unnecessary but wastes DSP resources The graphic below illustrates why control signal oversampling is effective By sampling the audio waveform with finer resolution we can detect peak excursions that would be otherwise missed In fact if both...

Page 89: ...2 milliseconds through 0 5 milliseconds allow the limiter to lookahead in time and react to signal peaks before they arrive at the limiter s gain control algorithm Attack time settings greater than 0 5 milliseconds and up to the limit of 100 milliseconds cause the limiter to operate conventionally For example if the attack time control is set to 1 0 milliseconds the actual attack time is 0 5 milli...

Page 90: ...Hard clipper style has an infinite ratio with no increase in peak levels once its threshold is achieved This clipper adds brightness and density to the program This clip style is the cleanest of the three styles because unlike the other two see below no clipping occurs below the clip threshold The other reason this is a cleaner clipper is because the distortion spectrum created by this style is mo...

Page 91: ...e analog and HD signals as closely as possible and then the Fine delay control is used to trim the delay to pre cisely compensate for that in the HD channel Generally it is a good idea to set the Fine delay to midrange before adjusting Coarse delay Resolution of the Coarse delay is 50 milliseconds The Fine control covers a range of 50 milliseconds in 0 1 millisecond 100 microsecond steps If the Fi...

Page 92: ...he manner described in the earlierAM 10HD Graphical Interface Operation sec tion Lower settings more negative numbers reduce the threshold causing limiting to occur at lower audio levels Conversely higher thresholds cause limiting to occur at higher audio levels Because of the frequency response contouring in AM NRSC pre emphasis it is generally customary to adjust the limiter thresholds in somewh...

Page 93: ...ther extreme generate very competi tive loudness The thresholds may be precisely tuned to taste format and competitive needs The clippers may also be disabled by changing the 10 band operating mode to Limit Only As we mentioned previously although each band has its own distortion masking continuous deep clipping in excess of 6dB to 10dB should be approached with cau tion This is because although t...

Page 94: ...final clipper The attack times for each band are adjustable from 0 1 milliseconds 100 microseconds to 1000 milliseconds 1 second Faster attack times exert more control over waveform excursions while slower attack times allow peaks to escape the limiter section with less control Attack times are generally adjusted to taste keeping in mind that the slower the attack time the more work the final clip...

Page 95: ...se times can also increase intermodulation distortion the mixing of low and high frequency energy or a muddying of the sound The release times for each band are adjustable from 30 milliseconds to 1000 milliseconds 1 second Faster release allows a more rapid recovery after a limiting event while slower release times do the opposite Release times should be adjusted to taste keeping in mind that the ...

Page 96: ...zation are recommended once final limiting has been accomplished in the 10 band section In fact the adjustment range has been limited to 6dB in order to curtail the temptation to perform aggressive equalization where it is the most inappropriate and even this range is quite large considering the ef fect that can be created Small adjustments in EQ boost on the order of 1dB or 2dB at most are suffic...

Page 97: ...djustments The clipping created by the Tilt Test option is soft in order to prevent transmitter damage due to the excessively fast rise time that a simple square wave signal would have It also automatically clips at 50 amplitude to prevent full modulation at the test frequency when Tilt Test is selected The Tilt Test option is also used when adjusting the High Frequency Correction controls to comp...

Page 98: ... in both polarities is very good at all settings The AM 10HD s AM mode is capable of providing very dense modulation up to the 200 yes we said 200 limit of its Positive Modulation Asymmetry control We equipped the AM 10HD with this capability because 1 not every country in the world is bound by the United States 125 positive modulation limit and 2 the detectors within theAM 10HD s unique multiband...

Page 99: ...sity Delay for the analog side of the AM signal LF Tilt This section contains the three controls that are used for compen sating the infrasonic frequency response of the AM transmitter in order to compensate for inadequacies in its low frequency response Such inadequacies typically manifest in the inability to accurately control modulation on low frequency waveforms that have been peak limited by ...

Page 100: ... on the high side of its response curve which can more closely compensate for the low frequency phase characteristics of many transmitters Finally the bandpass design is safer in that it provides correction down to frequencies that are appropriate and then the response rolls off quickly below that If a transmitter cannot be adequately corrected with our bandpass design then it would likely perform...

Page 101: ...presented by Figure C alternately adjust the Tilt Corrector s F Fre quency Q Bandwidth and L Level controls in order to achieve the flattest top and bottom of the waveform It is entirely possible to overcorrect for tilt If the transmitter response starts looking like Figure B you have gone too far The ideal case is to have the waveform look exactly like Figure C but sometimes perfect correction is...

Page 102: ...applied This procedure is as follows 1 Connect the AM 10HD to the audio input of the transmitter to be tested 2 Connect the transmitter to either a dummy load of rated power or to the an tenna system 3 Turn on the AM 10HD s Test Oscillator Adjust it to a frequency of 8kHz Adjust the Test Oscillator Level control and the Analog 1 or Analog 2 output as appropriate until approximately 80 modulation i...

Page 103: ...low You may need to find a compromise setting such as that shown in Figure B Fortransmitter antennasystemcombinationsthatcannotbeadequatelyovershoot corrected we recommend operating the audio processor with one of the narrower bandwidth settings This is because wider bandwidth settings combined with ag gressive audio processing may stress the transmitter s final RF stage matching network and anten...

Page 104: ...wing are considered to be AM 10HD SYSTEM or global pa rameters which are saved with presets but not restored when presets are taken unless the Input Output Settings Change With Presets checkbox in the System menu is checked INPUT SCREEN Source Analog or AES Analog Gain AES Gain Balance Phase Rotator Input Failsafe HD LIMITER SCREEN Phase Reverse Left Right Reverse Output Level AM LIMITER SCREEN Em...

Page 105: ...al processing chain as follows Input Output of the audio input selector analog or AES Line Input Audio appearing on the analog line input AES Input Audio appearing on the AES3 digital input Compressor Output of the multiband compressor PreDelay Output of the AM limiter before the diversity delay AM Output Output of the AM limiter after the diversity delay NOTE The AM 10HD headphone routing selecto...

Page 106: ...o increase volume and counter clockwise to reduce it Note The headphone outputs of the AM 10HD are drivenbyNationalSemiconductorLM675powerop erational amplifiers which are capable of driving very high currents 3A into any reasonable load Actual headphone impedance is not a concern however headphone circuit current limiting is provided at 160mA in order to protect external devices In additional to ...

Page 107: ... combination of characters numbers or symbols If the Remember this password check box is checked the GUI stores the password on the local PC If you do not check the check box you will be asked for the password the next time you connect since the first round of verification will fail When asked for a password while logging in you can also check the remember box to save what you enter That way you d...

Page 108: ...rson may make changes to a preset but may not save them GUI Lock In the event that security has been enabled by configuring the GUI Access Code PermissionsDialog above thenselectingGUILockwillimmediatelylocktheGUIon the host PC prohibiting access until it has been unlocked with the proper access code Unlocking the AM 10HD GUI when the passcode has been lost or forgotten The following instructions ...

Page 109: ...ºC and will vary somewhat depending on ambient temperatures When the Temp indicator is green the operating temperature inside the AM 10HD is satisfactory When it is red the temperature has reached 50ºC or higher and is too high Note The AM 10HD contains one small fan to stir the air inside the AM 10HD chassis in order to maintain a more uniform temperature distribution Normal ventilation of the AM...

Page 110: ...we do not have alternate skins other than the skins shown in the Choose Skin dialog below nor a method for users to create their own skins When new skins become available they will be downloadable from our Wheatstone Processing website www wheatstone processing com ...

Page 111: ...on desired dates and times There is also a Long Term Rotation utility to allow one time preset changes to be scheduled for any time in the future To create edit or view entries in the Event Scheduler click the Events but ton on the System Screen The following Event Scheduler screen will open and the events list will be empty when opened for the first time ...

Page 112: ...ime that the preset should change 4 Next choose the preset that should be selected at the time programmed in the previous step When finished editing click OK AsmanypresetchangeeventsasdesiredmaybeprogrammedintheEventScheduler If a one time preset change is required such as might be necessary for a special holiday or other event the Long Term Rotation routine should be used Creating a Long Term Rot...

Page 113: ... button on the right side of the Event Scheduler window The highlighted scheduledeventwillberemovedfrom the list Note that there is no confirma tion prior to the actual deletion of the event Set Time Allows the system time of the AM 10HD onboard computer to be set or changed The AM 10HD system time can be synchronized to external time servers SNTP or Simple Network Time Protocol if desired Alterna...

Page 114: ...eadily in succession This is a very direct means of comparing presets It is important to remember to save the present settings as a preset before invoking others or they will be lost Note also that you can only Take presets that are already loaded in the AM 10HD from this dialog box Save Asmall Windows dialog box appears which prompts for a name under which to save the present settings of theAM 10...

Page 115: ...columns being the preset number and the AM 10HD preset contents The upper and lower right hand panels give access to the GUI s presets library The contents of folders in the upper panel are shown in the lower panel Drag and drop al lows movement between the library folders and the AM 10HD and its mirror archive in the GUI ...

Page 116: ...ardware itself will be visible in the left pane There are two ways to manage the lock status of user presets The first method is by highlighting a preset single left click and then right click ing it to open a dialog box Among the options are Lock Preset and Unlock Preset The second method is by highlighting a preset as above and then clicking the Edit option at the top of the Preset Library dialo...

Page 117: ...o temporary buffers that can hold all current AM 10HD processing settings as long as power is applied to the unit While QSave A is highlighted green any adjustments that you make to controls on the AM 10HD are being saved to its temporary buffer A QSave B operates similarly to QSave A Its being selected is shown by its green highlighting and it operates on buffer B One way to use this feature is t...

Page 118: ...is you would Load the preset that you want to change then make changes to it and press QSave A to save those settings to buffer A Make additional changes as desired and then press QSave B to save those ad ditional changes to buffer B Now you can compare the two sets of settings by toggling back and forth be tween QSave A and QSave B When you are pleased with one set of settings and need more buffe...

Page 119: ...reflects an AM 10HD Offline meaning the GUI and AM 10HD are disconnected Trying meaning the GUI is attempting to find the AM 10HD on the LAN and connect to it An adjacent button toggles between Online and Offline Devices The name of theAM 10HD to which the GUI is connected or with which it is attempting to connect shows here in amber Double clicking on the name area brings up the Devices form A li...

Page 120: ...is for those who feel the need to set up complex audio processors without listening to them Changes can be made to preset settings and configurations and manipulation of the presets selection list can be made without affecting signal processing within the AM 10HD itself which can continue to be processing away obliviously Preset list manipulation can be undertaken Online too Importantly any adjust...

Page 121: ...ram Hardware Menu Items The Hardware menu tree may be accessed by right clicking anywhere on the main AM 10HD Control Panel Please note that many of these functions require you to be con nected Online to an AM 10HD Sub menu choices include Devices Opens the Devices dialog box Allows the creation editing selection and deleting of Wheatstone processors connected to your system On Line Mode Toggles b...

Page 122: ...on VBN The VBN VBN stands for Vorsis Binary Nugget This file contains highly encrypted ver sions of the motherboard application code FPGA images and DSP code To update the AM 10HD right click on any por tion of the upper control area in any screen of the remote GUI to open the pop menu tree and select the Hardware Update option The following screen will appear Navigate to the location of the VBN f...

Page 123: ...ocess has finished you will be prompted to reboot the AM 10HD by the prompt below When the AM 10HD reboots the new VBN code will be running on the moth erboard Presets Menu Items The Presets menu tree may be accessed by right clicking anywhere on the main AM 10HD Control Panel Take Brings up the Take Preset dialog box Save Brings up the Save as Presets dialog box Presets Brings up the Preset Libra...

Page 124: ...page 4 1 AM 10HD Aug 2008 S C H E M A T I C D R A W I N G S I O Schematic Drawings Load Sheet Chapter Contents AM 10HD Signal Flow Diagram 4 2 Audio Processor AM 10HD Schematic 4 3 Load Sheet 4 8 ...

Page 125: ... BAND PARAMETRIC EQUALIZER HIGHPASS FILTER OVERSHOOT CALCULATOR M S COUPLING MATH M S 4 BAND PARAMETRIC EQUALIZER Parametric Equalizer Insert Points NRSC Preemphasis AES Pre Post Delay COMPRESSOR M S Analog Input ANALOG LEFT AGC FAILOVER LOGIC MATRIX AGC 5 BAND CROSSOVER 10 BAND LIMITER TX OUTPUTS LOOKAHEAD LIMITER MATH OUTPUT TRIM OPTIONAL CLIPPER ANALOG RIGHT LOOKAHEAD LIMITER AES OUT ANALOG LEF...

Page 126: ...47uF 16V 16V CT31 1 10 11 12 13 14 15 16 17 18 19 2 20 3 4 5 6 7 8 9 GND 3 3V 16V CT27 4 3 2 1 CT28 1 2 Q5 MMBTA05 100K R342 49 9K R341 C570 68pF 10 0K R343 3 3V 12V CT21 1 2 3 C173 330uF 8V GND 220 R236 D13 BAT54 GND D13 BAT54 3 3V D26 4148 3 3V C333 4 7uF C397 4 7uF GND Q6 2 1 3 LT1117 OUT IN GND C604 4 7uF C603 4 7uF C578 4 7uF TP8 10 0K R388 D28 4148 2 5V GND C579 47uF C581 47uF CT19 1 2 3 4 5...

Page 127: ...9 11 2 14 6 15 23 13 AD1896 MUTE_I MCLK_I WLNGTH_O_1 WLNGTH_O_0 SMODE_O_1 SMODE_O_0 SMODE_I_2 SMODE_I_1 BYPASS SMODE_I_0 LRCLK_I SCLK_I SDATA_I TDM_I RESET ______ GRPDLYS MMODE_I_2 MMODE_I_1 MMODE_I_0 MUTE_O MCLK_O LRCLK_O SCLK_O SDATA_O VDD_IO 3 3V GND U20 13 23 15 6 14 2 11 19 5 10 4 9 1 16 12 18 17 7 20 27 26 28 3 25 24 AD1896 MUTE_I MCLK_I WLNGTH_O_1 WLNGTH_O_0 SMODE_O_1 SMODE_O_0 SMODE_I_2 SM...

Page 128: ... 14dBu 14dBu AGND 475 R107 475 R99 AGND AGND AGND 3 3V 39 R102 VA 3V 2 VA 3V 2 2 5V 2 2 5V 2 2 5V 2 3V 2 VA 2 5V 2 3V 2 L26 VA 2 5V 2 VA 1 00K R126 1 00K R124 1 00K R151 1 00K R83 1 00K R55 1 00K R57 BAT54 D6 BAT54 D5 BAT54 D5 BAT54 D6 BAT54 D2 BAT54 D1 BAT54 D1 BAT54 D2 0 22uF C124 0 22uF C109 AK5394 27 2 20 28 18 1 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 19 21 22 23 24 25 26 U24 VREFR VREFL BGND A...

Page 129: ...7 0 1uF 0 1uF C169 1 00K R82 3V 3 1 00K R131 3V 3 AGND AGND 0 1uF C60 0 1uF C63 0 1uF C62 0 1uF C61 47 R71 47 R98 3 3V 3V 3 L28 47uF C95 47uF C103 47uF C80 47uF C150 47uF C162 47uF C132 47uF C149 1SMB5919 Z1 5 6V AGND AGND AGND AGND J4 AGND GND AGND AGND AGND AGND AK4396 2 18 17 22 23 24 20 21 16 19 15 1 4 8 28 27 26 25 9 11 10 7 6 5 3 14 13 12 U28 AOUTL VREFH VREFL AOUTR ACKS DZFR TST2 CAD1 TST1 ...

Page 130: ...88 7K R361 D24 1 2 3 MBR 4060P A1 K A2 C599 47uF C598 1500uF 3 3V C566 47uF C583 1500uF L37 4 7uH C576 47uF C567 1500uF VCC 8V C535 330uF C538 22uF C452 330uF C451 22uF L34 18uH 16V C453 330uF C458 22uF C497 330uF C496 22uF 16V C498 330uF C506 22uF L35 18uH 100 R363 220 R338 619 R318 2 43K R290 1 00K R378 2 43K R305 C323 0 47uF SA WWP 6 18 08 W 700867 AM 10HD 80S0047 12 AP 1000G PCB G 12 OF 13 AM ...

Page 131: ...page 4 8 AM 10HD Audio Processor Load Sheet AM 10HD Oct 2008 ...

Page 132: ...page A 1 AM 10HD Aug 2008 A P P E N D I X Appendix Parameters Units and Ranges A 2 Contents ...

Page 133: ...signal amplitude of 2V and minimum allowable input signal amplitude of 200mV Input Gain Adjustment Ranges Gain Adjustment 12dB 36dB Gain Adjustment Increments 0 5dB Gain Calibration Again control setting of 0 0 aligns an external 0dBFS signal with the AM 10HD s 0dBFS internal reference Input Failsafe Type Automatic Analog Fail Cause Audio level below 48dBFS Response Time 30 seconds Digital Fail Ca...

Page 134: ...e post five band AGC 6 0dB post HD AM multiband limiters Five Band AGC Compressor Operates in sum difference or matrix mode with the gain linked at AGC time constants Drive Gain OFF or 79 0dB to 6 0dB in 0 5dB steps 1dB steps below 60dB Makeup Gain Range 20 0dB to 48 0dB 0 5dB steps AGC Compressor Thresholds 35dBFS to 65dBFS AGC Threshold Backoff 0dB to 12dB AGC Attack 50mS 1500ms 1 5 sec AGC Rele...

Page 135: ... the AM 10HD s HD output Overall Controls Source Compressor MB Limiter VBMS Bandwidth 4kHz 16kHz 1kHz steps or OFF 20kHz HF Protect 3kHz 16 kHz behavior program controlled Ceiling 0dB 48dB 0 5dB steps HyperMono Behavior program controlled Lookahead Limiter Threshold Trim 6 0dB Lookahead Limiter Attack 0 2ms 100ms Lookahead Limiter Release 33ms 330ms Lookahead Limiter Delayed Release 100ms 1000ms 1...

Page 136: ...S Frequency 60 300Hz Multiband Knee Soft Hard Multiband Threshold 10dB relative to Drive Multiband Attack 0 1ms 1000ms 1Sec Multiband Release 30ms 1000ms 1Sec Pre emphasis Modes Off MRSC Pre emphasis insert points Pre MB Limiter Pre lookahead limiter Post lookahead limiter pre clipper Lookahead Limiter Threshold Trim 6 0dB Lookahead Limiter Attack 0 2ms 100ms Lookahead Limiter Release 33ms 330ms L...

Page 137: ...0 24 0dBu peak Phase Reversal on all outputs Digital Output Level 35 5dBFS 0 0dBFS 0 1dB steps plus OFF DeEmphasis Complementary to Pre Emphasis Output may be pre or post diversity delay Presets An advanced preset management system allows the creation storing and recall of 80 pre sets within the AM 10HD itself and an unlimited number on a host PC All signal processing parameters are contained in t...

Page 138: ...port to create a Logic High and may be either momentary or latching as desired Voltages are applied between the appropriate GPI pin and Common with the GPI pin being the most positive voltage Please see manual text for the required current limiting resistor for voltages above 3 3VDC Ethernet Interface TheAM 10HD contains a five port auto sensing 10 100BaseT Ethernet switch with one of the ports av...

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