RME Audio HDSPe MAD User Manual Download Page 37

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User's Guide HDSPe MADI

21. Hotline – Troubleshooting

The newest information can always be found on our website

www.rme-audio.com

, section Sup-

port, Macintosh OS.

Playback works, but record doesn’t:

•

Check that there is a valid signal at the input.

•

Check whether the Hammerfall DSP has been selected as recording device in the audio

application.

•

Check whether the sample frequency set in the audio application (‘Recording properties’ or

similar) matches the input signal.

•

Check that cables/devices have not been connected in a closed loop. If so, set the system’s

clock mode to Master.

Crackle during record or playback:

•

Increase the number and size of buffers in the application.

•

Try different cables to rule out any defects here.

•

Use an external FireWire drive for the audio data. Internal SATA drives overload the system

bus in some Macs, thus disturb PCI audio.

The card and drivers have been installed correctly, but playback does not work:

•

Is Hammerfall DSP listed in the System Profiler/PCI? (Vendor 10EE, Device ID 3FC6).

•

Has Hammerfall DSP been selected as current playback device in the audio application?

Summary of Contents for HDSPe MAD

Page 1: ...ADI PCI Express Digital I O Card 64 Channels MADI Interface 24 Bit 192 kHz Digital Audio Stereo Analog Monitoring 128 x 64 Matrix Router 2 x MIDI I O MIDI embedded in MADI Quick Boot TotalMix 24 Bit 192 kHz 9 SyncAlign ZLM SyncCheck SteadyClock ...

Page 2: ...Installation 12 10 2 Driver Update 12 10 3 De Installing the Drivers 13 10 4 Firmware Update 13 11 Configuring the HDSPe MADI 11 1 Settings Dialog 14 11 2 Settings Dialog DDS 16 11 3 Clock Modes Synchronization 17 12 Operation and Usage 12 1 Playback 19 12 2 DVD Playback AC 3 DTS 20 12 3 Notes on WDM 21 12 4 Multi client Operation 21 12 5 Digital Recording 23 13 Operation under ASIO 13 1 General 2...

Page 3: ...Various Information 36 21 Hotline Troubleshooting 37 Connections and TotalMix 22 Connections 22 1 Headphones 40 22 2 MADI I Os 40 22 3 MIDI 41 23 Word Clock 23 1 Word Clock Input and Output 41 23 2 Technical Description and Background 42 23 3 Cables and Termination 43 23 4 General Operation 44 24 TotalMix Routing and Monitoring 24 1 Overview 45 24 2 The User Interface 47 24 3 Elements of a Channel...

Page 4: ... a Subgroup Loopback 61 26 6 Using external Effects Devices 62 26 7 MS Processing 63 27 TotalMix MIDI Remote Control 27 1 Overview 64 27 2 Mapping 64 27 3 Setup 65 27 4 Operation 65 27 5 Simple MIDI Control 66 27 6 Loopback Detection 67 Technical Reference 28 Tech Info 70 29 Technical Specifications 29 1 Inputs 71 29 2 Outputs 71 29 3 Digital 72 29 4 MIDI 72 30 Technical Background 30 1 MADI Basic...

Page 5: ...User s Guide HDSPe MADI RME 5 User s Guide HDSPe MADI General ...

Page 6: ...k Info guide RME Driver CD MIDI breakout cable Expansion Board ribbon cable 14 conductor 3 System Requirements Windows XP or higher Mac OS X Intel 10 4 8 or higher PCI Express Interface a free PCI Express slot 1 lane version 1 1 4 Brief Description and Characteristics All settings can be changed in real time 8 available buffer sizes latencies 0 7 1 5 3 6 12 23 46 93 ms 32 channels 96 kHz 24 bit re...

Page 7: ...ss and fasten the screw 6 Insert the Expansion Board and fasten the screw 7 Replace the computer s housing 8 Reconnect all cables including the power cord 6 Hardware Connectors 6 1 External Connectors The bracket of the main board has two MADI inter faces optical and coaxial input and output each a MADI error LED and the analog stereo output Identical signals are avail able at both the optical and...

Page 8: ...lable separately Part Number Description BOHDSP9652 MIDI breakout cable VKHDSP9652 14 conductor flat ribbon cable ONK0100 MADI Optical Network Cable 3 3 ft 1 m ONKD0300 MADI Optical Network Cable 10 ft 3 m ONKD0600 MADI Optical Network Cable 20 ft 6 m ONKD1000 MADI Optical Network Cable 33 ft 10 m ONKD2000 MADI Optical Network Cable 66 ft 20 m ONKD5000 MADI Optical Network Cable 165 ft 50 m 8 Warr...

Page 9: ... Alesis Corp Microsoft Windows 2000 Windows XP Windows Vista and Windows 7 are registered trademarks or trademarks of Microsoft Corp Steinberg Cubase and VST are registered trademarks of Steinberg Media Technologies GmbH ASIO is a trademark of Steinberg Media Technologies GmbH Copyright Matthias Carstens 02 2010 Version 1 3 Current driver version Windows 3 083 Mac OS X 2 71 Firmware 25 Although th...

Page 10: ...d to try to correct the interference by one or more of the following measures Reorient or relocate the receiving antenna Increase the separation between the equipment and receiver Connect the equipment into an outlet on a circuit different from that to which the receiver is connected Consult the dealer or an experienced radio TV technician for help RoHS This product has been soldered lead free and...

Page 11: ...User s Guide HDSPe MADI RME 11 User s Guide HDSPe MADI Driver Installation and Operation Windows ...

Page 12: ...ver Software Update dialog The refore this dialog has to be started manually after the failed driver installation Hit the Win key type Device Manager start the Device Manager by selecting it from the list and hit Enter The device is shown with a yellow warning symbol Usually it is already found in the correct category Sound Video and Game Controller Plug Play detects a multimedia device Right clic...

Page 13: ...lled driver Start the program pcie_fut exe The Flash Update Tool displays the current revision of the HDSPe MADI and whether it needs an update or not If so then please press the Update but ton A progress bar will indicate when the flash process is finished The bar moves slowly first program then faster verify If more than one interface card is installed all cards can be flashed by changing to the...

Page 14: ... bottom of the dialog box give the user precise information about the current status of the system and the status of all digital signals Quick Boot All the card s settings described below are stored in a hardware memory and are loaded im mediately after a power on of the computer In clock mode Master even the last used sample rate is set Directly after switching on the computer a stable and predic...

Page 15: ...ncCheck indicates whether there is a valid signal Lock for the inputs Word Clock and MADI or if there is a valid and synchronous signal Sync The AutoSync Reference display shows the input and frequency of the current sync source MADI In Defines the input for the MADI signal Optical relates to the optical input Coaxial to the BNC socket MADI Out Defines the format of the MADI output signal MADI can...

Page 16: ... tween SteadyClock RME s sensational Low Jitter Clock System is based on a Direct Digital Synthesizer DDS This superior circuitry can generate nearly any frequency with highest pre cision DDS has been implemented into the HDSPe MADI with regard to the needs of professional video applications as well as to maximum flexibility The dialog DDS includes both a list of typi cal video frequencies so call...

Page 17: ...th AutoSync an automatic clock source selection which adopts the first available input with a valid digital signal as the clock reference input The input currently used as sync reference is shown in the AutoSync Ref status field together with its current sample frequency AutoSync guarantees that normal record and record while play will always work correctly In certain cases however AutoSync may ca...

Page 18: ...er slave devices Remember that a digital system can only have one master If the HDSPe s clock mode is set to Master all other devices must be set to Slave RME s exclusive SyncCheck technology first implemented in the Hammerfall enables an easy to use check and display of the current clock status The SyncCheck field indicates whether no signal No Lock a valid signal Lock or a valid and synchronous ...

Page 19: ... Blaster clone and select this one as Preferred Device in Control Panel Multimedia Audio The screenshot to the right shows a typical configuration dialog as displayed by a stereo wave editor After se lecting one of the 32 playback devices audio data is sent to the according audio channels Increasing the number and or size of audio buffers may prevent the audio signal from breaking up but also incr...

Page 20: ...rk select the WDM playback device Loudspeaker of the HDSP MADI in XP Control Panel Sounds and Multimedia Audio and Use only default devices has to be checked Additionally the loudspeaker setup found under Volume Speaker Settings Ad vanced has to be changed from Stereo to 5 1 Surround Vista 7 Control Panel Sound Playback as Standard Additionally the loudspeaker setup found under Configuration has t...

Page 21: ... the channel number at the end HDSP MADI 1 2 is the first stereo device HDSP MADI 3 4 is the next stereo device HDSP MADI 1 2 3 4 are the channels 3 4 of the first 8 channel interleaved device We recommend to not use these special interleaved devices Also note that it is not possible to use one stereo channel twice the basic and the interleaved device even with different applica tions Information ...

Page 22: ...ual stereo devices The multi client op eration works as described above with WDM ASIO and GSIF Interleaved active The WDM devices can also be used as 8 channel devices Unfortunately the Kernel Mixer active with any WDM playback then always occupies and blocks 8 channels at once even when WaveLab or the Media Player perform just a stereo playback 2 channels So If the Loudspeaker device is used the ...

Page 23: ...ributes or similar dialog The screenshot to the right shows a typical dialog used for changing basic parameters such as sample frequency and resolution in an audio ap plication Any bit resolution can be selected providing it is supported by both the audio hardware and the software Even if the input signal is 24 bit the application can still be set to record at 16 bit reso lution The lower 8 bits a...

Page 24: ...xample by reducing the PCI Bus Utilization Another common source of trouble is incorrect synchronization ASIO does not support asyn chronous operation which means that the input and output signals not only have to use the same sample frequency but also have to be in sync All devices connected to the Hammerfall DSP must be properly configured for Full Duplex operation As long as SyncCheck in the Se...

Page 25: ...mple reason for it for example simul taneous operation of ASIO and GSIF on the same channels If Gigastudio starts up properly loads gig files too but won t play at all even when using the virtual keyboard Go to Hardware Routing and select a valid MIDI input port Note that blank is not valid but none is The limitation of 32 channels is caused by Gigastudio 2 54 According to Tascam Gigastudio 3 will...

Page 26: ... from the HDSP system hardware with near zero CPU load Spectral Analyser World wide unique 10 20 or 30 band display in analog bandpass filter technology 192 kHz capable Vector Audio Scope World wide unique Goniometer showing the typical afterglow of an oscilloscope tube Includes Correlation meter and level meter Surround Audio Scope Professional Surround Level Meter with extended correlation analy...

Page 27: ... Windows 2000 XP on single CPU systems To use ASIO at lowest latencies under Windows 2000 XP even when only having one CPU the system performance has to be optimized for background tasks Go to Control Panel System Advanced Performance Options Change the default Applications to Background tasks The lowest usable latency will drop from 23 ms to around 3 ms 17 2 Installation Hammerfall DSP is found i...

Page 28: ...28 User s Guide HDSPe MADI RME ...

Page 29: ...User s Guide HDSPe MADI RME 29 User s Guide HDSPe MADI Driver Installation and Operation Mac OS X ...

Page 30: ...omputer when installation is done 18 2 Driver Update In case of a driver update it s not necessary to remove the old driver first it will be overwritten during the installation 18 3 Flash Update The Flash Update Tool updates the HDSPe MADI card to the latest firmware version It requires an already installed driver Start the program HDSPe Flash Update The Flash Update Tool displays the current revi...

Page 31: ...not be changed during playback or record if it can be avoided as this can cause unwanted noises The status displays at the bottom of the dialog box give the user precise information about the current status of the system and the status of all digital signals Quick Boot All the card s settings described below are stored in a hardware memory and are loaded immediately after a power on of the compute...

Page 32: ...o the next available one The current clock source and sample rate is displayed in the AutoSync Ref display The automatic clock selection checks and changes between the clock sources Word Clock TCO and MADI Input Status Displays the state of the current input signal Channel format 64 or 56 channels Frame format 48K or 96K Sample rate measured Active input optical or coaxial System Clock Shows the c...

Page 33: ...fic card Changing the sample rate in bigger steps during record playback often results in a loss of audio or brings up warning messages of the audio software Therefore the desired sample rate should be set at least coarsely before starting the software DDS Activates all settings of this dialog Value Shows the sample rate as adjusted in this dialog The sample rate is defined by the basic setting Fr...

Page 34: ...tically switches clock mode to Master Thanks to its AutoSync technique and lightning fast PLL the HDSP is not only capable of han dling standard frequencies but also any sample rate between 28 and 200 kHz Even the word clock input which most users will use in varispeed operation allows any frequency between 28 kHz and 200 kHz The HDSPe MADI s outstanding clock control allows for a synchronization ...

Page 35: ...on In some cases also or only a repair of the disk permission will help We have also received reports saying the driver update could not be installed on the system disk shown red crossed during the installation Repairing permission may also help here If not we re sorry but have to recommend to contact Apple Our driver has no knowledge of fold ers disks etc the installation is handled completely by...

Page 36: ...t available Via System Preferences Audio MIDI Setup the hardware can be configured for the system wide usage Programs that don t support card or channel selection will use the device selected as Standard Input and Standard Output Soundstudio Mplayer Amplitube etc In the lower part of the window the audio hardware s capabilities are shown and can be changed in some cases On the record side no chang...

Page 37: ...s the input signal Check that cables devices have not been connected in a closed loop If so set the system s clock mode to Master Crackle during record or playback Increase the number and size of buffers in the application Try different cables to rule out any defects here Use an external FireWire drive for the audio data Internal SATA drives overload the system bus in some Macs thus disturb PCI au...

Page 38: ...38 User s Guide HDSPe MADI RME ...

Page 39: ...User s Guide HDSPe MADI RME 39 User s Guide HDSPe MADI Connections and TotalMix ...

Page 40: ... adapter TRS plug to RCA phono plugs or TRS plug to TS plugs is re quired The pin assignment follows international standards The left channel is connected to the tip the right channel to the ring of the TRS jack plug 22 2 MADI I Os The BNC input s ground free design is built according to AES10 1991 The input impedance is 75 Ohm It will operate error free from about 180 mVpp on The optical input an...

Page 41: ... the green LED is lit and the Settings dialog shows either Lock or Sync see chapter 30 2 Thanks to RME s Signal Adaptation Circuit the word clock input still works correctly even with heavily mis shaped dc prone too small or overshoot prone signals Thanks to automatic signal centering 300 mV 0 3V input level is sufficient in principle An additional hysteresis reduces sensitivity to 1 0 V so that o...

Page 42: ...as clock reference In a digital studio synchronisation is maintained by connecting all devices to a central sync source For example the mixing desk works as master and sends a reference signal the word clock to all other devices Of course this will only work as long as all other devices are equipped with a word clock or sync input thus being able to work as slave some professional CD players indee...

Page 43: ...actory If the output breaks down to 3 Volts when terminating with 75 Ohms you have to take into account that a device of which the input only works from 2 8 Volts and above does not function correctly al ready after 3 meter cable length So it is not astonishing that because of the higher voltage word clock networks are in some cases more stable and reliable if cables are not terminated at all Idea...

Page 44: ...gnal is detected the green LED at the bracket is lit and the Settings dialog shows either Lock or Sync see chapter 30 2 In the status display AutoSync Ref the display changes to Word This message has the same function as the green Lock LED but appears on the monitor i e the user can check immediately whether a valid word clock signal is present and is currently being used In the line Freq the Auto...

Page 45: ...lete implementation of the ADM functions Integration of external devices Use TotalMix to insert external effects devices be it in the playback or in the record path Depending on the current application the functionality equals insert or effects send and effects return for example as used during real time monitoring when adding some reverb to the vocals Every single input channel playback channel a...

Page 46: ...46 User s Guide HDSPe MADI RME ...

Page 47: ...from an Inline desk so that the row Software Playback equals the Tape Return of a real mixing desk Top row Hardware inputs The level shown is that of the input signal i e fader independ ent Via fader and routing field any input channel can be routed and mixed to any hardware output bottom row Middle row Playback channels playback tracks of the audio software Via fader and routing field any playbac...

Page 48: ...ng the application for the first time a default file is loaded sending all playback tracks 1 1 to the corresponding hardware outputs with 0 dB gain and activating phones monitoring Hold down Ctrl and click on preset button 5 to make sure that factory preset 5 is loaded The faders in the top row are set to maximum attenuation called m a in the following so there is no monitoring of the input channe...

Page 49: ...en channels 7 and 8 The present pan value is also being displayed below the fader Please carry out the same steps for Out 2 now in order to route it to output 8 as well In short While editing the Submix 7 8 you have direct access to other submixes on other channels because their routing fields are set to different destinations And you get a direct view of how their faders and panoramas are set up ...

Page 50: ...adjusted accordingly and all fader settings remain stored The same is true for Quad Speed operation 192 kHz with 16 channels 24 5 Submix View Such a wide range of possibilities make it difficult to maintain the overview Because as shown practically all hardware outputs can be used for different Submixes up to 32 completely inde pendent stereo submixes 16 4 channel submixes etc And when opening the...

Page 51: ...ck and forth be tween a signal distribution complete input monitoring a stereo and mono mix and various submixes without any problem If any parameter is being altered after loading a preset e g moving a fader the preset display flashes in order to announce that something has been changed still showing which state the present mix is based on If no preset button is lit another preset had been loaded...

Page 52: ...l display set to RMS 3 dB View Submix active Note This preset is Default offering the standard functionality of a I O card Preset 2 Description All channels routed 1 1 input and playback monitoring As Preset 1 plus 1 1 pass through of all inputs Preset 3 Description All channels routed 1 1 no input and no playback monitoring All faders set to maximum attenuation Preset 4 Description All channels r...

Page 53: ...ree des tinations Monitor Phones described below The microphone level is adjusted with the channel s input fader Monitor Phones 1 2 3 Use the drop down menu to select the hardware outputs where the submixes are sent to These submixes are usually phones mixdowns for the musicians A click on the button allows for the monitoring of the specific submix via the Monitor Main output So when setting up or...

Page 54: ...right mouse click on the grey name field brings up the dialog box Enter Name Any name can be entered in this dialog Enter Return closes the dialog box the grey label now shows the first letters of the new name ESC cancels the process and closes the dialog box Moving the mouse over the label brings up a tool tip with the complete name The hardware outputs third row can be edited in the same way In ...

Page 55: ...otalMix also supports combinations of these keys If you press Ctrl and Alt at the same time clicking with the mouse makes the faders jump to 0 dB pairwise and they can be set pairwise by Shift Alt in fine mode Also very useful the faders have two mouse areas The first area is the fader button which can be grabbed at any place without changing the current position This avoids unwanted changes when ...

Page 56: ... all faders will be treated as stereo pairs and moved pair wise Hotkey L MS Processing Macro for a quick configuration of routing and phase for Mid Side encoding and decoding See chapter 26 7 Level Meter Setup Configuration of the Level Meters Hotkey F2 See chapter 24 14 Level Meter Text Color Colour adjustment for the Gain and Level meter text displays Default Hue 110 Saturation 225 Brightness 13...

Page 57: ...S Hotkey 3 or 0 The latter is a point often overlooked but nonetheless important A RMS measurement shows 3 dB less for sine signals While this is mathematically correct it is not very reasonable for a level meter Therefore the RMS readout is usually corrected by 3 dB so that a full scale sine signal shows 0 dBFS on both Peak and RMS meters This setting also yields directly readable signal to noise...

Page 58: ...ld Shows the current gain value as dB Orange gain field This routing is muted Blue field Phase 180 inverted To maintain overview when the window size has been reduced the left and upper labels are floating They won t leave the visible area when scrolling 25 3 Operation Using the Matrix is a breeze It is very easy to indentify the current crosspoint because the outer labels light up in orange accor...

Page 59: ...level setting You just need 2 seconds to be sure no unwanted routing is active anywhere and that all levels match precisely Example 2 The Matrix allows you to set up routings which would be nearly impossible to achieve by fiddling around with level and pan Let s say you want to send input 1 to output 1 at 0 dB to output 2 at 3 dB to output 3 at 6 dB and to output 4 at 9 dB Each time you set up the...

Page 60: ...en the menu Edit It shows Copy In 5 Now select the desired new input for example In 8 The menu now shows Paste In 5 to In 8 Click on it done If you are familiar with this functionality just use Ctrl C and Ctrl V Else the self updating menu will always let you know what actually will happen Tip Have the Matrix window open as second window when doing this It will show the new routings immediately so...

Page 61: ...ing channel is no longer sent to the recording software but still passed through to TotalMix Therefore TotalMix can be used to route this input signal to any hardware output Using the subgroup recording the input can still be recorded on a different channel As each of the 64 hardware outputs can be routed to the record software and none of these hardware inputs get lost TotalMix offers an overall ...

Page 62: ...and the panorama fully to the right Adjust the input level at the reverb unit to an optimal setting Next the output of the reverb unit is connected to a free stereo input for example 5 6 Use the TotalMix level meters to adjust a matching output level at the reverb unit Now click on channels 11 12 in the bottom row and move the fader of inputs 5 6 until the reverb effect gets a bit too loud in the ...

Page 63: ...e channel represents L R During record the monitoring needs to be done in conventional stereo As TotalMix can invert the phase it also offers the functionality of a M S decoder The menu Options includes a macro to simplify the setup First select the two input channels in the picture to the right MADI In 3 and 4 having the current routing destination MADI Out 1 2 Now the string MS Processing In 3 4...

Page 64: ...ace elements Element Meaning in TotalMix Channel faders 1 8 volume Master fader Main Monitor channel s faders SEL 1 8 DYNAMICS reset fader to Unity Gain V Pots 1 8 pan pressing V Pot knobs pan center CHANNEL LEFT or REWIND move one channel left CHANNEL RIGHT or FAST FORWARD move one channel right BANK LEFT or ARROW LEFT move eight channels left BANK RIGHT or ARROW RIGHT move eight channels right A...

Page 65: ...ature causes heavy overload of the MIDI port when ganging more than 2 faders In such a case or when using the Behringer BCF2000 turn off this option When Full LC Display Support is turned off only a brief information about the first fader of the block channel and row is sent This brief information is also available on the LED display of the Behringer BCF2000 Tip for Mac OS X users LC Xview www opu...

Page 66: ... 1 Talkback 5E 94 A 5 Monitor Phones 1 3F 63 D 3 Monitor Phones 2 40 64 E 3 Monitor Phones 3 41 65 F 3 Preset 1 36 54 F 2 Preset 2 37 55 G 2 Preset 3 38 56 G 2 Preset 4 39 57 A 2 Preset 5 3A 58 A 2 Preset 6 3B 59 B 2 Preset 7 3C 60 C 3 Preset 8 3D 61 C 3 An example of a small MIDI controller covering such MIDI functionality and even some more is the Behringer BCN44 This little box has 4 pots and 8...

Page 67: ...ntrol protocol requires feedback of the received commands back to the hard ware controller So usually TotalMix will be set up with both a MIDI input and MIDI output Un fortunately any small error in wiring and setup will cause a MIDI feedback loop here which then completely blocks the computer the CPU To prevent the computer from freezing TotalMix sends a special MIDI note every 0 5 seconds to its...

Page 68: ...68 User s Guide HDSPe MADI RME ...

Page 69: ...User s Guide HDSPe MADI RME 69 User s Guide HDSPe MADI Technical Reference ...

Page 70: ...the driver updates DIGICheck Analysis tests and measurements with RME audio hardware A description of DIGICheck including technical background information ADI 8 Inside Technical information about the RME ADI 8 24 bit AD DA converter Many background information on laptops and tests of notebooks HDSP System Notebook Basics Notebook Hardware HDSP System Notebook Basics The Audio Notebook in Practice ...

Page 71: ...zation even in varispeed operation Not effected by DC offsets within the network Signal Adaptation Circuit signal refresh through auto center and hysteresis Overvoltage protection Level range 1 0 Vss 5 6 Vpp Lock range 28 kHz 200 kHz Jitter when synced to input signal 1 ns Jitter suppression 30 dB 2 4 kHz 29 2 Outputs MADI Coaxial via BNC 75 Ohm according to AES10 1991 Output voltage 600 mVpp Cabl...

Page 72: ...rnal clocks about 30 dB 2 4 kHz Effective clock jitter influence on DA conversion near zero Provides nearly jitter free word clock directly from the MADI input signal Input PLL ensures zero dropout even at more than 100 ns jitter Supported sample rates 28 kHz up to 200 kHz Compliant with PCI Express Base Specification v1 1 1 Lane PCI Express Endpoint device no PCI Express to PCI Bridge 2 5 Gbps li...

Page 73: ...nced coaxial cables with 75 Ohms BNC plugs they are not expensive and easy to get The optical interface is much more interesting due to its complete galvanic separation but for many users it is a mystery because very few have ever dealt with huge cabinets full of professional network technology Therefore here are some explanations regarding MADI optical The cables used are standard in computer net...

Page 74: ... it is Master too and thus slightly higher or lower than the HDSPe MADI s internal sample rate Result When reading out the data there will frequently be read errors that cause clicks and drop outs Also when using multiple clock signals a simple LOCK is not sufficient The above described problem can be solved elegantly by setting the HDSPe MADI from Master to AutoSync its in ternal clock will then ...

Page 75: ...over sampling plus digital filtering in order to move the error prone analog filters away from the au dible frequency range as far as possible This typically generates a delay of one millisecond A playback and re record of the same signal via DA and AD loopback then causes an offset of the newly recorded track of about 2 ms Low Latency The HDSPe MADI uses a hi class DA converter from Cirrus Logic ...

Page 76: ...ilable that could receive or transmit more than 48 kHz Therefore a work around was used instead of two channels one AES line only carries one channel whose odd and even samples are being distributed to the former left and right channels By this you get the double amount of data i e also double sample rate Of course in order to transmit a stereo signal two AES EBU ports are necessary then This tran...

Page 77: ...channel requires two AES EBU lines stereo requires even four This transmission mode is being called Quad Wire in the professional studio world The AES3 specification does not mention Quad Wire With MADI sample multiplexing is used as well to offer sample rates higher than 96 kHz In fact technical reasons require to use this method beyond 96 kHz A 192K or 384K Frame for mat would not be fully compa...

Page 78: ...kHz SteadyClock has originally been de veloped to gain a stable and clean clock from the heavily jittery MADI data signal The embedded MADI clock suffers from about 80 ns jitter caused by the time resolution of 125 MHz within the format Common jitter values for other devices are 5 ns while a very good clock will have less than 2 ns The picture to the right shows the MADI input signal with 80 ns of...

Page 79: ...y however it has a number of different names like Dual AES Double Wide Dual Line and Wide Wire The AES3 specification uses the uncommon term Single channel double sampling frequency mode When used with the ADAT format the term S MUX is commonly used Double Wire not only works with Single Speed signals but also with Double Speed As an ex ample Pro Tools HD whose AES receiver transmitter only work u...

Page 80: ...channels at up to 96 kHz The advantage of this format against 48K Frame using S MUX the receiver can detect the real double sample rate on its own and im mediately With 48K Frame and S MUX the user has to set up the correct sample rate in all involved devices manually ...

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