In the thread "Missing sync pulse and the club standard --- Why?" discussion has gone off at a tangent into the realms of storage media for NBTV that satifies the requirements.
So that thread can continue in it's intended course I've started this one which I hope will deal with the problems that conventional storage media poses for NBTV and a means to circumvent them.
For the time being it's best to stick with Klaas's and Vic's colour encoding format to be used within .wav files rather than an audio CD standard. There is in theory no reason why these couldn't be DC coupled which would eliminate the problems inflicted by AC coupling and a frequency response that doesn't go all the way down to DC.
Using a sample rate of 48kHz rather than 44.1kHz means we get 120 samples per line rather than the awkward 110.25. Files of the same duration will be 9% bigger, but in todays world that's no real issue. An hour of two 16-bit data streams sampled at 48kHz comes out at 691.2 Megabytes which would just fit on a CD and more recent flash drives.
The use of a .wav file format means that it can be handled just like any other file, on (data) CD, flashdrives, it can be e-mailed, posted to this forum or placed on a web site for download. It might be a little impolite to post a file of that size in this forum without checking with Andrew first!
The use of a PC sound-card or a conventional audio CD player is easy and convienient. Plus with the PC you can edit and do other things to the data you might want to. However, they are not DC coupled, at least I haven't come across one that is.
So here's the challenge...
An interface that takes signals from the source and generates a DC-coupled .wav file. This can be in several formats, all compatible
1) Mono 8-bit at 48kHz, video only as the greyscales I have posted.
2) Stereo 8-bit mono video and sound at 48kHz. (8-bit sound can be quite good!)
3) Stereo 16-bit, video encoded as per Klass & Vic's standard and 16-bit mono sound.
There are other combinations, but that's enough for now.
On playback it should simply do the reverse of above and output up to four DC coupled signals, R, G, B and sound. (OK, the sound doesn't need to be DC coupled and it's probably better that it isn't, but that's easy).
Another advantage is that those that don't want to use the interface can still play the files back on a PC with a soundcard, but the colour information would be as good as lost resulting in a compatible monchrome signal.
So gents, let's get on with it.
As a footnote, I noticed some years ago that some audio editing sofware has a 'software capacitor' within it thereby completely undoing all we are setting out to do here. Caution is advised.
Steve A.