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User's Guide
DMC-842
The Digital Microphone Interface
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SyncAlign
I64 Option Slot
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SteadyClock
SyncCheck
MultiMode
8-Channel Digital Microphone Interface with Line Outputs
8-Channel AES to Analog / ADAT Interface
AES/EBU Format and Sample Rate Conversion
Optional 64-Channel MADI Interface
24 Bit / 192 kHz Digital Audio
MIDI Remote Control
AES-3
AES-10
AES42
24 Bit Interface
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Table of Contents
Related Manuals for RME Audio DMC-842
Summary of Contents for RME Audio DMC-842
- Page 1 User’s Guide DMC-842 The Digital Microphone Interface ™ ™ SyncAlign I64 Option Slot ™ ® ™ SteadyClock SyncCheck MultiMode 8-Channel Digital Microphone Interface with Line Outputs 8-Channel AES to Analog / ADAT Interface AES/EBU Format and Sample Rate Conversion Optional 64-Channel MADI Interface...
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Page 2: Table Of Contents
10.12 Control Pulse (Cp)..........22 10.13 Sync Pulse (SP) ...........22 The Parameter Menu 11.1 General ..............23 11.2 Low Cut ..............23 11.3 Directivity Pattern ..........23 11.4 Pre-Attenuation ............24 11.5 Mute ..............24 11.6 Peak Limiter ............24 11.7 Command Type............24 User’s Guide DMC-842 © RME... - Page 3 Digital Outputs 14.1 AES / EBU ............31 14.2 ADAT Optical ............32 14.3 I64 MADI Card ............. 33 14.4 Differences DMC-842 / ADI-642......34 Analog Outputs ............35 Word Clock 16.1 Word clock Input and Output ....... 36 16.2 Technical Description and Background ....37 16.3 Cables and Termination........
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Page 4: Important Safety Instructions
When mounting in a rack, leave some space between this device and others for ventilation. Unauthorized servicing/repair voids warranty. Only use accessories specified by the manufacturer. Read the manual completely. It includes all information necessary to use and operate this device. User’s Guide DMC-842 © RME... -
Page 5: General
User’s Guide DMC-842 General User’s Guide DMC-842 © RME... -
Page 6: Introduction
1. Introduction The DMC-842 is both an AES/EBU interface as well as a controller for digital microphones. The unique device allows for connection and control of up to 8 digital microphones, and converting their signals to ADAT, AES/EBU, analog and (optional) MADI. Eight switchable hi-end sample rate converters offer a flexible clocking and further usage options. -
Page 7: First Usage - Quick Start
4. First Usage – Quick Start 4.1 Controls - Connectors - Displays The front of the DMC-842 features eight LED level meter, eight numerical LED displays, eight Select keys, a rotary encoder, further keys for more specific configuration options, and 69 LEDs providing a detailed status display. - Page 8 IEC receptacle for power connection. The specially developed, internal hi-performance switch mode power supply lets the DMC-842 operate in the range of 100V to 240V AC. It is short- circuit-proof, has an integrated line-filter, is fully regulated against voltage fluctuations, and sup- presses mains interference.
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Page 9: Quick Start
4.2 Quick Start After connection of all cables and power-on of the device, the configuration of the DMC-842 begins in the CLOCK section. Choose a clock source and a sample rate. The next step is the configuration of the input channels. When using digital microphones DPP (digital Phantom power) must be activated. -
Page 10: Warranty
Audio AG does not accept claims for damages of any kind, especially consequential damage. Liability is limited to the value of the DMC-842. The general terms of business drawn up by Au- dio AG apply at all times. - Page 11 In case a disposal of electronic waste is not possible, the recycling can also be done by IMM Elektronik GmbH, the manufacturer of the DMC-842. For this the device has to be sent free to the door to: IMM Elektronik GmbH Leipziger Straße 32...
- Page 12 User’s Guide DMC-842 © RME...
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Page 13: Usage And Operation
User’s Guide DMC-842 Usage and Operation User’s Guide DMC-842 © RME... -
Page 14: Front Panel Controls
For safety reasons, the DMC-842 will leave the selected function after 6 seconds. This may seem cumbersome when changing the gain frequently, because the gain function will have to be selected every time via the Select button or the encoder first. -
Page 15: Clock Section
DMC-842's word clock output or AES/ADAT/MADI output. The DMC-842 thus has to be master, all devices connected to it must be slave. In order to avoid clicks and drop outs due to faulty or missing synchronicity, a special process called SyncCheck compares the incoming data and the DMC-842's internal clock. -
Page 16: Remote
(DPP, STEREO etc). 9.2 Gain The DMC-842's GAIN can be set individually per channel over a range of 0 db up to +63 dB, in steps of 1 dB. The device has its own gain control, operational even in the asynchronous Mode 1, and –... -
Page 17: Mode 2
When connecting more than one microphone, the usage of sample rate converters for clock-decoupling is unavoidable. In the newer Mode 2 the digital microphone is clock slave. The DMC-842 determines the fre- quency and generates a digital control signal for each microphone. A sample rate conversion is not required in this case. -
Page 18: Src
192 kHz can be converted to any sample rate down to 32 kHz, and 32 kHz can be converted to any frequency up to 192 kHz. When using the internal clock, every SRC also works as a jitter killer. However, the DMC-842 is equipped with SteadyClock, thus operating as perfect jitter killer with any clock source. -
Page 19: The Setup Menü
Default: 01 Available settings: 01, 02, 03, 04, 05, 06, 07, 08 To remote control more than one DMC-842 each device can have its own ID, providing a sepa- rated remote control of multiple devices via a single MIDI channel. -
Page 20: Auto Id (Au)
This option relates to the use of the I64 MADI Card. When multiple devices are connected seri- ally, the MADI I/O of each DMC-842 causes a delay of 3 samples. Therefore at the MADI output of the last device, the data of all upstreamed devices are delayed. At Double Speed the delay rises to 6 samples per unit, at Quad Speed to 12 samples. -
Page 21: Follow Clock (Fc)
S/MUX method the device else can not know which of the incoming 2 (DS) or 4 (QS) word clock edges is the right one. * With the DMC-842 this limitation is also valid for the AES output, as the device internally handles all the data streams in S/MUX mode. -
Page 22: Analog Output (Ao)
With the setting IF (Interface, means DMC-842) the gain stage of the DMC-842 is used exclusively. In this case a gain of 0 dB is sent as AES42 control data to the microphone. -
Page 23: The Parameter Menu
11. The Parameter Menu 11.1 General After pressing the PAR button below the rotary encoder the DMC-842 enters the Parameter menu. All eight PAR LEDs light up. Turning the encoder knob scrolls through the available op- tions. After selecting the desired option press and hold the Select key of the channel where the parameters shall be changed. -
Page 24: Pre-Attenuation
11.7 Command Type (ComtyPE) The DMC-842 offers access to the command bytes 1, 2 and 4. The parameter of the command byte can be set like done in the other functions, using Select keys and rotary encoder. The pa- rameter values are displayed hex-coded (00 –... -
Page 25: Remote Control
Furthermore, upon request it will report the complete device status, including all con- trols and LEDs on the front plate. Each DMC-842 can be programmed with its own ID, providing a separated remote control of multiple devices via a single MIDI channel. A description of the MIDI implementation is found in chapter 21. -
Page 26: Remote Control Software
Setup menu, and direct access to the AES42 features of the connected microphones. After the start first select a MIDI input and output which is connected to the DMC-842, via Op- tions - MIDI I/O Setup. - Page 27 The button Receive Data allows a one-time request of all settings of all DMC-842. Via File / Save complete setups with up to 8 DMC-842 can be saved and recalled anytime. Via MIDI remote control, all front panel controls of the DMC-842 can be locked (Lock Keys). An exception is the REMOTE key.
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Page 28: Rs232
12.4 RS232 The DMC-842 is already equipped with a serial interface port. Please note that this port is with- out functionality at this time and reserved for future upgrades. The functionality of a RS232 extender (pass-through of the serial data via MADI) as known from other RME devices is for technical reasons not available with the DMC-842. -
Page 29: Inputs And Outputs
User’s Guide DMC-842 Inputs and Outputs User’s Guide DMC-842 © RME... -
Page 30: Digital Inputs
The DMC-842 supports single wire only, in the range of 32 kHz up to 192 kHz: a total of 8 channels, 2 channels per AES wire. The effective sample frequency equals the clock on the AES wire. -
Page 31: Digital Outputs
Channel Status ‘Consumer’! In such cases the above adapter cable will not work. The DMC-842 supports Single Wire only, in the range of 32 kHz up to 192 kHz: a total of 8 chanels, 2 channels per AES wire. The effective sample frequency equals the clock on the AES wire. -
Page 32: Adat Optical
(2 x ADAT splitter). As the ADAT optical signal is physically specified up to 48 kHz only, the DMC-842 automatically activates Sample Split mode (S/MUX) at 88.2 and 96 kHz, distributing the data of one channel to two output channels. -
Page 33: I64 Madi Card
96k frame. A manual selection of the output format, and with this a converter functionality 48k/96k, is not available. With an installed I64 MADI Card the DMC-842 can be remote controlled via MADI. At the same time MIDI data are transmitted via MADI, see chapter 12.2. -
Page 34: Differences Dmc-842 / Adi-642
ID, and with this the according channel routing. Mixed setups: Auto ID and Auto are compatible. In contrast (A)DC is automatic only with the 642. The DMC-842s require to activate Delay Compensation manually in each unit. User’s Guide DMC-842 © RME... -
Page 35: Analog Outputs
Headroom @ +4 dBu Lo Gain +19 dBu 15 dB +4 dBu +13 dBu 9 dB Set to +24 dBu the DMC-842 is compatible to SMPTE (+24 dBu @ 0 dBFS, +4 dBu with 20 dB of headroom). User’s Guide DMC-842 © RME... -
Page 36: Word Clock
BNC output (see section 18.10). Input The DMC-842's word clock input is active when WCK is chosen in the clock section. The signal at the BNC input can be Single, Double or Quad Speed, the DMC-842 automatically adapts to it. As soon as a valid signal is detected, the WCK LED is constantly lit, otherwise it is flashing. -
Page 37: Technical Description And Background
CD players indeed have a word clock input). Then all devices get the same clock and will work in every possible combination with each other. Remember that a digital system can only have one master! If the DMC-842 uses its internal clock, all other devices must be set to ‘Slave’ mode. -
Page 38: Cables And Termination
– be held at the last valid frequency. 17. MIDI The DMC-842 has a standard MIDI input and output, a 5-pin DIN jack each. The MIDI I/O is used for: • remote control of the DMC-842, see chapter 12.1 •... -
Page 39: Technical Reference
User’s Guide DMC-842 Technical Reference User’s Guide DMC-842 © RME... -
Page 40: Technical Specifications
• 8 x XLR, transformer-balanced, galvanically isolated • Compatible to AES3 und AES/EBU • Technical specifications like AES1, plus • Digital Phantom Power (10 V), switchable per input • Transmission of Sync and Control Pulses User’s Guide DMC-842 © RME... -
Page 41: Digital Outputs
• Supported sample rates: 28 kHz up to 200 kHz 18.5 MIDI • 16 channels MIDI • 5-pin DIN jacks • Optocoupled, ground-free input I64 MADI Card • Invisible transmission via User bit of channel 56 (48k frame) User’s Guide DMC-842 © RME... -
Page 42: General
At the time of writing this manual, the unit is shipped with firmware 1.06. The firmware version is displayed after power on for about one second on the Gain displays of the DMC-842. The cur- rent version of firmware and remote software support the AES42 standard revision of 2006. - Page 43 3 = - (cold) Note on the analog outputs: The output circuitry does not operate in a servo-balanced way. When connecting unbalanced devices make sure that pin 3 of the XLR output stays uncon- nected. User’s Guide DMC-842 © RME...
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Page 44: Technical Background
The Quad Wire method allows to transmit two channels at up to 192 kHz via ADAT. The method is referred to as S/MUX4. Note: All conversions of the described methods are lossless. The existing samples are just spread or re-united between the channels. User’s Guide DMC-842 © RME... -
Page 45: Lock And Synccheck
PLL tracks the receiver's frequency. If an AES or MADI signal is applied to the DMC-842, the corresponding LED starts flashing. The unit indicates LOCK, i. e. a valid input signal (in case the signal is in sync, the LED is constantly lit, see below). -
Page 46: Latency And Monitoring
The DMC-842 uses a high-class DA-converter from Texas Instruments, offering exceptional Signal to Noise and distortion figures. Its digital filter delays the analog output signals by 29 samples. The exact delays caused by the DA-conversion of the DMC-842 are: Sample frequency kHz 44.1... -
Page 47: Ds - Double Speed
(CD...), Quad Speed has had no broad success so far. An implementation of the ADAT format as double S/MUX (S/MUX4) results in only two channels per optical output. Therefore in Quad Speed mode the DMC-842 is limited to 4 chan- nels at the ADAT outputs. -
Page 48: Aes/Ebu - Spdif
The table shows that a Professional-coded signal would lead to malfunctions for copy prohibi- tion and emphasis, if being read as Consumer-coded data. Nowadays many devices with SPDIF input can handle Professional subcode. Devices with AES3 input almost always accept Consumer SPDIF (passive cable adapter required). User’s Guide DMC-842 © RME... -
Page 49: Madi Basics
2 km. Single mode allows for much longer distances, but it uses a completely different fibre (8 µm). By the way, due to the wave-length of the light being used (1300 nm), the opti- cal signal is invisible to the human eye. User’s Guide DMC-842 © RME... -
Page 50: Steadyclock
The cleaned and jitter-freed signal can be used as reference clock for any application, without any problem. The signal processed by SteadyClock is of course not only used internally, but also available at the DMC-842's word clock output. It is also used to clock the digital outputs MADI and AES/EBU. -
Page 51: Block Diagram
20. Block Diagram User’s Guide DMC-842 © RME... -
Page 52: Midi Implementation Dmc-842
After being triggered by receiving a request value command, device sends a string of all value response data bytes. Message type is set to 30h. Set Interface Value Sets any number of parameters. nn / oo can be repeated freely. User’s Guide DMC-842 © RME... - Page 53 F0 00 20 0D 42 (bank no. / dev ID) 31 (ch.1) (ch.2) (ch.3) (ch.4) (ch.5) (ch.6) (ch.7) (ch.8) F7 The peak level value will be stored and transmitted with the next level meter data request, and the stored value will be reset. User’s Guide DMC-842 © RME...
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Page 54: Table
SRC: 0 = off, 1 = on M/S: 0 = off, 1 = on (set only ch. 1, 3, 5, Stereo: 0 = off / 2 x mono, 1 = stereo LSB / DPP: 0 = off, 1 = on User’s Guide DMC-842 © RME... - Page 55 Input 4 Lock: 0 = unlock, 1 = lock (Request only) Input 3 Sync: 0 = no sync, 1 = sync (Request only) LSB / 0 Input 3 Lock: 0 = unlock, 1 = lock User’s Guide DMC-842 © RME...
- Page 56 Level: 1..12 = < -60 / -50 / -42 / -36 / -30 / -24 / Level: -18 / -12 / -6 / -3 / -1 / -0.1 dBFS LSB / 0 LSB / 0 Level: 13 = > -0.1 dBFS (over) User’s Guide DMC-842 © RME...