Section 3
Block Diagrams and Frame Wiring
3-1. Block DiagramsAudio Signal Flow
Digital audio (16 channels) comes into the 8 AES inputs
DADR-5000 Functional Descriptionon the AES board where it is converted to a TDM stream;
This section provides a brief description of the majoranalog audio (16 channels) comes into the analog converter
functional of the DADR-5000.board where it is converted to a TDM stream and passed to
The DADR-5000 block diagram shows the PWBs containedthe AES board. The TDM stream travels over 2 signals,
in the DADR system.each carrying 8 channels of audio.
Some boards are standard off the shelf components andEach audio sample on the TDM stream can be a maximum
some are unique to the DADR.of 32 bits although only 24 bits are used or generated by
the AES board. A clock signal at 256*Fs and a frame sync
pulse is carried along with the TDM audio data.
Pentium PC Mother board
The PC Mother board is the main system processor. It runsBased on the userOs audio input selection, the appropriate
the DADR specific applications which perform the followingTDM stream is passed to the Quad SHARC board.
major functions:There it is processed and stored in DRAM to be transferred
1. Control of recording and playback of audio from theto the SCSI boards for recording to HDD.
HDD including creation and maintenance of event listsIt can also be passed back out as a TDM stream if input
and project files.monitor is enabled. Playback audio data is transferred via
2. Communication with networked DADRs via theSCSI from the HDD to the Quad SHARC board DRAM
token-ring interface.for processing and output as TDM stream.
3. Graphical user interface that allows user control of
multiple network boxes and event editing via mouse,The TDM digital audio output stream from the Quad
keyboard and VGA monitor.SHARC board goes to three places in the DADR as
4. Rate control for chasing/syncing to various timecodesfollows:
including LTC, VITC, biphase and P2.1. AES board for output to the AES digital outputs.
2. Analog converter board for digital to analog conversion
Interface to the HDD drives (or other media) is performed(16 channels).
through the Advansys SCSI adapters via the PCI bus.3. Front panel controller for meter display.
This allows audio data to be transferred directly between
the Quad SHARC board and SCSI bus without passingThe Backplane Interconnect Diagram shows the audio
through PC motherboard memory.signal flow described above as well as the serial control
signals that go from the Quad SHARC board to the AES
The following sections describe the operation of the boardsboard. If no SYNC board is present in the DADR, the AES
unique to the DADR.reference comes into the AES board and passes directly to
Detailed descriptions of the standard off the shelf componentsthe Quad SHARC board and the AES reference outputs
are available in the manufactureOs data sheets.(the DADR is a slave in this case).
If a SYNC board is present, the AES reference input goes
to the SYNC board where it is regenerated and sent back to
the AES board. From the AES board it goes to the Quad
SHARC board and reference outputs.
Note that if the DADR is slave without a SYNC board, the
AES reference must originate from another DADR that
generates an AES reference with time of day (TOD)
information.
If the AES reference is used simply as a source of audio
clock, a SYNC board must be present to regenerate the
AES reference with time of day (TOD) information.
DADR-50003-1 |
ACEC
