Posted: Mon Feb 11, 2008 6:47 pm
Telehor wrote:My Octagon replica , working on the 1928 US system with 48 lines and 20 fields is now working perfectly on an Aurora converter with a DVD player at his input. Denis
Denis, sorry for the slow response, it's been a hectic couple of weeks..
A standard consumer device with a playback (record too?) response might exist, as you say sampling at 96kHz or greater. But I'm unaware of one, but I'm sure there's the odd one that does.
I know the soundcard in my main desktop PC will play 96kHz sampled .wav files, as will my cheap laptop, but does it actually have an output response to some 40kHz? As yet I don't know. I just need some time to play around with it/them.
A quick calculation with your parameters shows you need a response to some 35kHz, plus any axtra for 'sync-time'. Much the same as Steve O's (Panrock) 80-line system, but his is at a lower frame/field rate.
..more on this in the main NBTV forum in due course.
Steve A.
P.S. I've just done some quick tests using the above .wav files and indeed my cheap on-board audio device is substantially flat, it plays the 32kHz .wav file at the same amplitude as the 1kHz one. The others also.
However, it could do with a filter on the output as there's quite a few artifacts of the sample rate mixed in. A better 'proper' soundcard one would hope would be an improvement on this. Some of the Creative products look very tempting, with sample rates up to 192kHz.