11-07-2017, 08:08 PM
Provided the audio is strictly synchornous to the video it's possible to simplify things. Especially if you choose your audio sampling frequency to give exactly 2 sample per TV line. This is a bit low so you might choose 3 samples per TV line. Both are non-standard audio sampling rates. If you don't do this there will be different numbers of audio samples on each line (3 or 4 for 48kHz audio on 625, 2 or 3 for 44.1kHz audio on 625) so you'll need a FIFO at each end plus controls to keep the FIFO from over or under flowing.
Whatever you do, the audio must never contain 00 or FF as these are reserved for TRS codes. S272M has a unique and rather clunky implementation to stop this happening. All later ANC packet standards (audio on HD, timecode etc etc) are a lot cleaner and simpler.
Whatever you do, the audio must never contain 00 or FF as these are reserved for TRS codes. S272M has a unique and rather clunky implementation to stop this happening. All later ANC packet standards (audio on HD, timecode etc etc) are a lot cleaner and simpler.
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv