Audio Sub-Board

[harrypm]

Audio Sub-Board

This segment of the project is mandatory for having a complete single run capture chain for VHS/Betamax formats like SMPTE-C/2" Quad/Umatic only have linear audio capture so they are stuck in automation limbo without the addition of a sub-board or version with audio inputs.

This issue tracks the ideas & solutions for audio.

Requirements

2-4 Channels with balenced/unbalenced support

For a dedicated device these connectors are suitable:

Quad TRS / Quad XLR TRS Combo - Nutrik Connectors

For a PC add-in card module style system however 6.35mm jacks are the best way to go.

Perposed Solutions

Pi Pico + Clock Source

• Single PCM1802
• Duel PCM1802

Using the current clockgen board as a foundation this would be easy to script into current CLI capture.

Namazso made a more slim down version here which will prob be the quickest solution to capture scripted using the MISRC clock source.

Custom Board

Using an PCM1840

Using an PCM4204

[namazso]

I made a simple PCM extractor for PCM1802: https://github.com/namazso/pcm_extract

Just hook up one or two of the chip on the aux bits and the clock at 512fsc master mode (only MODE0 bridged) and filter the aux data through the linked program. Naturally, if you use two then run it twice, with respective arguments.