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V1682OPMA.doc
17 February, 2005
1. DESCRIPTION
The V1682 reader is the counterpart of the V1681 generator, which together, make up the VALID (Video
& Audio Line-up and ID) system. The function of the V1682 is to detect the presence of a VALID test
signal, and verify that the audio/video timing has been preserved, and that the audio channels have not
been swapped, or inverted. Read-outs are provided on the front panel, indicating the audio-video delay
in milliseconds, the originating channel, and a warning if a channel is inverted.
The unit may take its audio input from an AES, or analogue input (depending on which audio module is
fitted), or it will also accept an audio stream embedded in the SDI video input.
The unit will also provide audio multiplexing and de-multiplexing functions, so the selected audio input
may be embedded into the SDI stream, or if the audio source is from embedded data, the audio may be
output in either AES or analogue form (depending again on the audio module fitted).
