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The DAVID IV utilizes ‘adaptive pre-emphasis,’ a term we

coined to describe an independent high-frequency limiter that

follows the broadband peak controller. Because this HF limit-

ing is performed only in the pre-emphasized domain, a judi-

cious amount of HF clipping may also be employed without

causing painful audible artifacts. The clipper algorithm in-

cludes proprietary distortion-cancellation techniques that sig-

nificantly reduce audible intermodulation artifacts, particularly

those associated with vocal sibilants.
The

FM HF-Lim:

slider programs the attack time of the inde-

pendent high frequency limiter. A minimum setting of 1 gives

a near-instantaneous attack, and the HF limiter will be working

its hardest to ensure negligible high frequency clipping. This

will sound somewhat dull, especially with pop-music sources,

but may keep artifacts to a minimum with more conservative

fare. As the slider is moved to the right and attack time in-

creased, more high-frequency peaks will slide through and be

clipped, rather than limited. A setting of 10 gives maximum

clipping, which will of course sound brighter, although clipping

artifacts may be objectionable. The factory default setting of 5

is a good compromise for most broadcast formats.
As seen on the Block Diagram (Page 10), adaptive pre-emphasis

is used only for FM program transmission. It is a fulltime func-

tion for the composite/MPX outputs, but is applied to the ana-

log and digital line outputs only in their FM modes for feeding

an FM exciter with a built-in stereocoder.
The characteristics of adaptive pre-emphasis are set when the

pre-emphasis selection is made: 75 microseconds for the West-

ern Hemisphere, 50 microseconds for Europe and most other

export areas. Pre-emphasis is selected under

Setup

COMPOSITE CLIPPING

MPX Clipping

Although associated with the built-in stereo generator, compo-

site clipping is considered a processing parameter.

The Compo-

site Clipping (dB):

slider is under the

Limiter

heading on the

Pro-

cessor

Webpage. Composite clipping has no effect on either the

analog or digital line outputs, even when they are set to their

FM modes.

At the user’s discretion, up to 3dB of composite clipping may

be introduced. This is brute-force, flat-topped clipping of the

baseband signal, but before the 19kHz stereo pilot and RDS

subcarrier are combined. Baseband clipping invariably gener-

ates harmonic components that can clutter the spectrum above

the program signal to a greater or lesser extent.
Composite clipping does provide some degree of loudness ad-

vantage with less perceived harshness than program signal

clipping in the L/R audio domain. Nonetheless, exercise this

Содержание DAVID IV 719 N

Страница 1: ...DAVID IV 719N FM Audio Broadcast Processor Installation User Guide www inovonicsbroadcast com ...

Страница 2: ......

Страница 3: ...21 Inovonics Inc 5805 Highway 9 Felton CA 95018 Tel 831 458 0552 Fax 831 458 0554 Register online at www inovonicsbroadcast com PRODUCT REGISTRATION RECORD Model 719N Serial No _____________ Purchase Date _____________________ Warranty Registered via Web Reg Date __________ By ____________ ...

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Страница 5: ...STALLATION Front Panel vs Web Interface Setup 11 UNPACKING AND INSPECTION MOUNTING Rack Requirement 12 Heat Dissipation 12 AC MAINS POWER Mains Voltage Selector 12 Mains Fuse 12 Power Cord 12 RADIO FREQUENCY INTERFERENCE RFI Location 12 Ground Loops 12 PROGRAM LINE INPUTS AES Digital Input 13 Analog Line Inputs 13 Unbalanced Operation 13 PROGRAM LINE OUTPUTS 20kHz Flat 14 Pre Emphasized FM Output ...

Страница 6: ... Downloading and Backing Up Settings 22 QUICK START TECHNOLOGY Instant Boot 22 Brownout Detection 22 THE DAVID IV FRONT PANEL Graphic Display 22 Metering 23 Jog Wheel and Back Button 23 Front Panel Setup Example 23 Menu Timeout and Screensaver 23 Languages 23 CONNECTING TO THE DAVID IV LAN Setup 24 IP Address and DHCP vs Static IP 24 Connecting 24 THE NOW PLAYING PAGE Product ID 25 Input Level Met...

Страница 7: ...NT Stereo Width 34 Solo Width 34 THE FIVE BAND MULTIPRESSOR Compressor Drive 35 Spectral Loading 36 Band Coupling 36 PROGRAM EQUALIZATION The 5 Bands Defined 37 Multipressor Crossovers and Time Constants 37 Crossover Points 38 Compressor Attack and Release 38 BASS EFFECTS Punch and Rumble 39 PROGRAM PEAK CONTROL Broadband and HF 40 BROADBAND LIMITING PIPP Limiting 40 Lookahead Limiting 41 ITU Norm...

Страница 8: ...TP Port 48 The Incoming IP Address 48 USING DYNAMIC DNS What is Dynamic DNS 48 Dynamic DNS Providers 48 Dynamic DNS Abuse 49 SNMP NOTES The SNMP Manager and MIB File 49 SNMP Settings 50 THE NETWORK STATUS SCREEN Current Status 50 UPDATING THE FIRMWARE Warning 51 Firmware Update Files 51 Running the Firmware Updater 52 Aborting a Firmware Update 53 Updating the DAVID IV Webpages 53 THE FRONT PANEL ...

Страница 9: ...e over LAN and Internet using any browser and SNMP is fully supported Additional software is no longer required DAVID IV FEATURES Framework Features Non subjective framework features that set the DAVID IV apart from competitive products Total local and remote control of DAVID IV setup and operation using either the front panel menu and jogwheel or any computer tablet or smart phone browser over pr...

Страница 10: ...uates unwanted sub bass program components Dual slope windowed AGC automatically corrects wan dering levels from the console or playout system main taining long term consistency between diverse program sources without altering the intended tonal balance 5 bands of dynamic range compression and equalization help create a sonic signature tailored to the station s format and personality Low bass augm...

Страница 11: ...er modulation L R Analog Line Outputs Residual noise better than 100dB below the output clipping point AES Digital Output Digital Input Residual noise better than 130dB below 0dBFS Distortion Composite MPX Output 0 01 THD Line Outputs Digital or Analog 0 006 THD Stereo Separation Composite MPX Output 65dB 20Hz 15kHz assuming the use of a lab quality FM multiplex decoder L R Analog Line Outputs 100...

Страница 12: ...ve windowed AGC is both peak and average responding with a capture correction range of 18dB Positive AGC gain may be truncated to any value between 18dB and 0dB The AGC window and correction rate are user programmable Stereo Enhancement This dual action utility effectively broadens the soundstage for the stereo program and the center channel solo component independently 5 Band Multipressor Program...

Страница 13: ...post processing 60dB attenuator AC Mains Requirements 105 130VAC or 210 255VAC 50 60Hz 8 watts Size H 1 in 44mm W 19in 483mm D 13in 330mm 1U Weight 9lb 4kg net 12lbs 5 4kg shipping Environmental Continuous operation guaranteed at ambient temperatures between 32 F 0 C and 122 F 50 C 0 95 relative humidity non condensing altitudes to 10 000ft 3048m Conformances EN50081 1 EN50082 1 93 68 EEC 2002 95 ...

Страница 14: ... 10 DAVID IV 719N Block Diagram ...

Страница 15: ... INSPECTION As soon as the equipment is received inspect carefully for any shipping damage If damage is found or suspected notify the carrier at once and then contact Inovonics We recommend retaining the original shipping carton and pack ing materials for return or transshipment If returned for War ranty repair shipping damage sustained as a result of improper packing for return may invalidate the...

Страница 16: ... unit A clearly marked slide switch is directly behind the AC mains connector on the circuit board Use a small screwdriver to set the switch for 115V or 230V operation Mains Fuse It is important to install the appropriate fuse as noted on the rear panel next to the fuseholder A for 115V mains A for 230V operation Fuses are the GMA S500 type 5mm X 20mm size fast blow Power Cord The detachable IEC t...

Страница 17: ...ctronically balanced transformerless left and right channel ANALOG INPUTS with female XLR connectors These are bridging high impedance inputs They do not pro vide termination for the console or other equipment that feeds the DAVID IV Here s why With few exceptions audio line impedance matching is ridi culed by today s hip broadcasters you and erudite equipment manufacturers us The concept of 600 o...

Страница 18: ...lar to FM Pre except that the signal has been normalized with a de emphasis net work to restore a flat frequency characteristic This output would be the proper feed to an FM exciter that does its own pre emphasis Although the audio response from this output is flat it still includes the 15kHz low pass filter and independent HF limiting to protect the spectrum and the stereo pilot plus it will also...

Страница 19: ...it volts 0dBu 0 775V r m s rather than one milliwatt in a 600 ohm circuit 0dBm The outputs have a resistive source impedance of 200 ohms that is there is a 100 ohm buildout resistor in each leg When feeding a 600 ohm load the actual dBm level will be 2 5dB below the Analog Level shown under the slider The range of the Analog Level dB slider covers traditional stu dio line levels e g Plus Four and ...

Страница 20: ...Other parts of the world have opted for one or the other of these so make sure you know what setting is the proper one for you location before proceeding The Pre Emphasis setting is on the Setup Webpage and under Setup Ste reo Generator in the front panel menu Monaural Operation Options Unforeseen instances could arise when you d need to revert to monaural operation For example sudden transmitter ...

Страница 21: ...Hz SYNC BNC connector gives a TTL compatible square wave output at the 19kHz stereo pilot fre quency when the RDS input is enabled both in normal stereo operation and in any of the monaural modes This signal is used to synchronize an RDS encoder with the stereo pilot It is a 5V p p square wave with a 50 duty cycle in phase with the stereo pilot component of the FM multiplex signal RDS Input The RD...

Страница 22: ...oadcasting system employed principal ly in the U S is a hybrid broadcasting system This means that the all digital signal carrier is transmitted on channel simultaneously with the traditional analog FM or AM carrier Legacy radios are thus able to receive the program in the usual manner and new HD Radio receivers can recover both the ana log and the digital versions of the program Because there is ...

Страница 23: ...from your station and then tune back again The transition should be seamless with no echo gaps stutter ing or level shift as the radio cross fades from analog to digital reception The delay may be set with fair accuracy using an HD Radio re ceiver that can be put into the split mode where the analog program is heard in one stereo channel and the digital program in the other Best to use headphones ...

Страница 24: ...ync perpetually This is a standalone processor that works with any audio processor any make of HD Radio im porter or exporter and any FM exciter You can check it out here https www inovonicsbroadcast com product 808 ...

Страница 25: ...r adjusted from the front panel There are differences between the two menu structures but both menus are quite intuitive and a full listing of the front panel menu tree can be found at the back of the manual on Page 55 Manual text will make mention of any major discrep ancies in the appropriate places USER ADJUSTMENT GROUPINGS Setup Adjustments Setup adjustments are those performed as the unit is ...

Страница 26: ...ing parameters in use previous to the power inter ruption are reloaded instantly from non volatile memory Brownout Detection Although the DAVID IV power supply and digital logic circuits will operate at AC mains voltages down to about 50 of nomi nal the graphic display and LED readouts would fail to give consistent indications at very low mains voltages A brownout detector reboots the unit at a ma...

Страница 27: ... over the RDS Input Level adjustment slider 8 push the jog wheel to enable the slider 9 turn the jog wheel to dial in the desired injection If you make a mistake for example you might push the jog wheel off center which could also rotate it and bring up the wrong menu simply push the Back button to return to the pre vious menu and try again Menu Timeout and Screensaver Once you ve made an adjustme...

Страница 28: ...address of the DAVID IV In this example the router has assigned an IP of 10 0 0 11 The factory default networking mode for the DAVID IV is the DHCP automatic assignment selection shown above If you need to assign a static IP address to your unit check the Static IP box either through front panel selection or using the Web interface easier After selecting a static IP you will be instructed to enter...

Страница 29: ...s ers to launch the Web interface This name can be changed on the Network setup Webpage which you may wish to do if you have more than one DAVID IV on your LAN Input Level Meters The bargraph display at the top of the screen is a peak responding meter at the input to the processor section This meter appears at the top of every Webpage Like the front panel L R INPUT LED display it shows the input l...

Страница 30: ...sor Bring up the Admin Web page and under Security simply type in pass words for Front Panel ac cess and or Webpages network access to the unit You can of course use the same password for both or enter just a network or just a front panel one Don t forget to write these down somewhere and then click Save Passwords To remove a password simply clear the box and save If you now try to navigate away f...

Страница 31: ...power WARNING A hard reset deletes not only the password but will also return the DAVID IV to factory default setup values User Presets your current on air processing setup and in out level settings will all be lost Be sure to keep a backup of the DAVID IV Hardware Profile all settings on your computer We discuss this procedure shortly OLED Display Brightness The front panel Administrative menu al...

Страница 32: ... of the Admin Webpage click Select Hardware Profile You ll be directed to locate the file that you previously downloaded and saved In this example the file had been saved to the Desktop 2 Double click or se lect and Open the file You ll see the file name populate the Select Hardware Profile bar on the Admin screen 3 Click Upload Hard ware Profile The file will be upload ed to the DAVID IV which wi...

Страница 33: ...ocessor Webpage In the list that pops up the 25 Factory F Presets come first Click on one and it will be on air immediately This selection may be automated using SNMP as well see Page 49 Note the 20 slots marked Empty below the F Factory Presets These are the spaces for your User Presets These will populate from the top of the Empty listings downward as you save your own Creating Managing and Savi...

Страница 34: ...AGC action is gated to freeze the gain during brief program pauses returning it to the 0dB resting point during extended periods of silence The Now Playing Webpage and front panel gate indica tors glow when the gate is open AGC active and dark with no valid input signal AGC is considered a processing parameter of the DAVID IV but one that by design does not really make a contribution to the statio...

Страница 35: ... Input Gain From the Setup Webpage or with the Setup Audio Input front panel menu grab the slider for whichever input you have se lected With program material playing adjust the appropriate Digital Gain dB or Analog Gain dB slider so that the AGC bar graph readout hovers around 0dB most of the time NOTE This is a bit more tedious using the Web interface be cause you must toggle back and forth to t...

Страница 36: ...stic This filter is a 4th order 24dB octave high pass which may be set for a turnover frequency 0 15dB point in this case be tween 20Hz and 65Hz The factory default is 20Hz which is probably a valid setting for any music format unless you have severe turntable rumble say what noisy studio air condition ing do a lot of outdoor sports remotes in windy stadiums or have creditors pounding on the front...

Страница 37: ...oming program level shifts abruptly The AGC Window db may be set to any figure between 0 no window and 12 12 meaning 6dB With the window set for the factory default value of 6 if the input signal wanders 3dB or less from the present corrected value any small required cor rection is a very unobtrusive 0 5dB second However if the in put signal suddenly blasts or takes a big dive the correction rate ...

Страница 38: ...ntrol is advanced the front panel OLED graphic display will high light an area outside the normal soundstage as shown here The shaded area as well as the number shown below it is some what arbitrary serving only to illustrate what s intended and to give a number for setup reference Stereo width growth is active only on stereophonic program material it does not imply any sort of stereo synthesis fr...

Страница 39: ...s fer function engineered for the most effective action within each band Optimum Multipressor parameter settings were derived from exhaustive tests by a core of listeners comprising both tech nical and non technical types including those with extensive musical training Many of these parameters are fixed as providing user control over the thousands of parameter permu tations would make setup a veri...

Страница 40: ...es where it is the greatest thus actually increasing program com ponents with lower energy at other frequencies As displayed on the RTA the shape of the audio spectrum will be flatter and the sound of the program will appear busier Spectral Loading almost always imparts additional brightness to the sound as higher frequencies are typically lower in total energy and will be brought up Band Coupling...

Страница 41: ...onsible for bright ness aliveness immediacy and closeness the ef fect that the program source is live and up front High Frequencies above the presence range contribute to the qualities generally dubbed sparkle crispness tinkle and air in the program audio The five EQ dB sliders are simply level controls in the outputs of the five bands where the spectrum is recombined Use these EQ sliders to craft...

Страница 42: ...hese settings are not selected with great care Thus we urge most users to leave these settings at or near the values within the ranges that are defined by factory processing presets You can pull this Webpage up and check what the current preset values are at any time Remember if you mess with these and get into trou ble just go back and choose a factory processing preset to re set these time const...

Страница 43: ... for augmenting deep bass content in the program material DAVID IV bass enhancement algorithms utilize compression expansion soft and hard clipping intermodulation generation and sidechain re modulation techniques This processing is purposely conducted in the monaural L R domain to optimize the effect and to prevent creation of stereo difference energy at these low frequencies NOTE Because bass en...

Страница 44: ...portion of the spectrum This is provided inde pendently by the adaptive pre emphasis stage that follows the broadband limiter and is active only for FM transmission Broadband limiting and adaptive pre emphasis will be dis cussed separately BROADBAND LIMITING PIPP Limiting PIPP is an acronym for Polarity Independent Peak Processing Inovonics patented and proprietary technology used in both analog a...

Страница 45: ...imiting Anyway there s an option to turn this novel feature off if you are a purist or otherwise don t buy into any of this Lookahead Limiting The DAVID IV broadband limiter is a lookahead limiter acting to reduce program peaks essentially before they reach it No this limiter is not a member of the Psychic Friends Network it simply introduces a short delay in the signal path so the limiter can sen...

Страница 46: ...he more G R that is shown the more consistently program peaks will hover right at the 100 mark Obviously a high energy rock format would justify a higher level of Limiter Drive perhaps in excess of 10dB and classical or jazz music should use a lower setting perhaps less than even 5dB Limiter Density While Limiter Drive dB forces program peaks toward the 100 modulation point Limiter Density dB serv...

Страница 47: ... it further found that modulation density was in large part responsible for this interference In other words not necessari ly the absolute peak deviation of the carrier but the r m s pow er of the modulating program signal integrated over a specified period of time The ITU Recommendation specifies the r m s power of the composite multiplex signal including the stereo pilot and any audio SCA or dat...

Страница 48: ...ng with both the letter and the law of the Recom mendation One caveat of the ITU Recommendation is that audio processing used to satisfy the requirement must not create audible side effects i e breathing pumping and obvious level shifts The user must thus exercise conservative judgment and avoid overuse of Multipressor and other sound enhancement fea tures when the ITU mode is active ADAPTIVE PRE ...

Страница 49: ...t broadcast formats As seen on the Block Diagram Page 10 adaptive pre emphasis is used only for FM program transmission It is a fulltime func tion for the composite MPX outputs but is applied to the ana log and digital line outputs only in their FM modes for feeding an FM exciter with a built in stereocoder The characteristics of adaptive pre emphasis are set when the pre emphasis selection is mad...

Страница 50: ...A 20dB 400Hz test tone applied at the input to the processing chain Pre will bring the AGC to 0dB unity gain 20dBFS is a nominal internal zero VU reference level at this point and re fers to the program s average level Gain associated with normal processing action is expected to drive the processor to full 0dB or 100 modulation output Thus when this same 20dB tone is applied after processing Post ...

Страница 51: ...itate to ask for help COMMUNICATING FROM OUTSIDE THE LOCAL NETWORK Static IP Assignment To address the DAVID IV from outside your Local Area Network LAN the unit must have a static IP address assigned rather than operating in DHCP mode with the IP assigned by a router The static IP must be outside the router s DHCP range On the Network Webpage set Mode to Static IP This unlocks the IP Address Gate...

Страница 52: ...s USING DYNAMIC DNS What is Dynamic DNS A router or server working in the DHCP mode makes efficient use of a limited IP address list by reassigning addresses as de vices disconnect from the network An Internet Service Provid er ISP uses this same technique on their clients primary ex ternal IP Web addresses Thus the incoming routing path to your DAVID IV may well change from time to time perhaps d...

Страница 53: ...ly the for free ones don t appreciate repeated and unnecessary IP address renewals If a particular account makes a nuisance of itself the provider may justifiably cut the user off In that case the entire Dynamic DNS registration and setup process will have to be repeated SNMP NOTES SNMP Simple Network Management Protocol allows other TCP UDP IP equipment on the same Local Area Network LAN to commu...

Страница 54: ...change them as required When the DAVID IV initiates an alarm rather than being que ried or polled for one the alarm is known as a trap Three lo cal network IP addresses may be entered into the Trap Destina tion 1 2 and 3 fields each corresponding to other devices on the LAN that need to receive alarms from the DAVID IV The MIB file is a small text file required by the SNMP Manager Click Download M...

Страница 55: ...d features to improve performance or otherwise expand the use fulness of the product Inovonics supplies firmware updates at no additional charge A bootloader is a simple software routine that runs on any PC that is on the same network as the DAVID IV By now you are able to easily secure a connection between the DAVID IV and your computer This must be a wired LAN connection for both the PC and for ...

Страница 56: ...IV Click OK That will start the firmware updating utility and display its main screen The bootloader window outlines the firmware update process in three easy steps The first step advises that the DAVID IV must itself be in the Firmware Update mode Using the front panel jog wheel navigate to Administrative Firmware Update This will bring up the first of two front panel screens each with a stern wa...

Страница 57: ...ber of the uploaded firmware Aborting a Firmware Update Before you have committed to a firmware update pushing the Back button will return you to previous screens effectively aborting the update process But once you see this message on your DAVID IV it is almost too late to turn back If for some reason the Firmware Updater cannot connect to the DAVID IV and you have not yet initiated Step 2 to beg...

Страница 58: ...lick the Webpage Uploader exe file shown with an arrow at right The third party boot loader screen below will pop up The location of your bin file should automatically populate the Select Webpage File address field You must enter the IP ad dress of your DAVID IV in the IP Address box so have it at the ready The Webpage Updater will display progress and apprise you of update success ...

Страница 59: ...ipressor EQ Bass set Low set MID set Pres set High set Crossovers Bass Low set Low Mid set Mid Pres set Pres High set Attack Release Bass A R set Low A R set MID A R set Pres A R set High A R set Bass Effects Active Bypass select Punch set Rumble set Peak Limiting PIPP Normal ITU select Limiter Drive set Limiter Density set FM HF Limiter Clip Limit set Stereo Enhance Active Bypass select Stereo Wi...

Страница 60: ...select Hostname data entry Username data entry Password data entry Proof Mode Operate Proof Mode select Oscillator Off Pre Post select Frequency set Level set HD Radio Delay Enable Disable select Delay set Alarms Analog Audio Loss Disable Enable select Threshold On set Time On set Threshold Off set Time Off set Digital Audio Loss Disable Enable select Threshold On set Time On set Threshold Off set...

Страница 61: ...modification or if the serial identifi cation label has been removed or altered III TERMS OF WARRANTY Inovonics Inc products are warranted to be free from defects in materials and workmanship A Any discrepancies noted within THREE YEARS of the date of delivery will be repaired free of charge or will be replaced with a new or remanufactured product at Inovonics option B Parts and labor for factory ...

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