Crystal Vision
Installation
TANDEM-200 User Manual R1.7
125
13/02/2008
RS4
RS4 cards are only useable in Mode 3. They provide 4 channels of audio inputs, which
are at a frequency and timing derived from the input SDI 1 embedded audio content. The
four channels of audio outputs have been re-sampled to provide frequency and timing
derived from the outgoing embedded audio content in SDI 2.
The SDI 1 & SDI 2 signals may be asynchronous, and even different line standards. For
example, 625 line standard on one SDI, and 525 line standard on the other SDI signal.
This makes it very useful for bridging Frame Synchronisers, Video Noise Reducers, and
Standards Converters, where the TANDEM-200 main PCB will also add audio delay set
to compensate for the video processing time - up to 681 milliseconds.
Because of the processing of the audio waveform, error words indicated by V bit set high
are ignored. Occasional errors marked by V bit high such as would be the case with a
noisy or too long AES input path, are masked out by the processing.
If the V bit is consistently high, to indicate continuous error states, or to indicate non
audio data, then the processor will give a silent output. All other cards, except DIP2RS,
pass audio data unaltered even when V bit is set or held high.
There are no jumpers required to be set on this card.
Note:
When only one RS4 sub-PCB card is fitted and re-sampling is ON the 4 outputs from the
side where no sub-PCB card is fitted will always be SILENT.
If re-sampling is OFF, then all 8 audio channels may be active since the sub-PCB cards
are bypassed with re-sampling OFF and therefore ignored whether fitted or not.
