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In Reply to: Re: Technical question for the Pros using yesterdays gear with todays (long) posted by Organbuff64' on March 15, 2002 at 22:13:25:
Rick,
In paragraph seven, I was continuing on the mastering theme, specifically with the need for two units. *-If-* you could somehow strip and re-construct the data, you'd still need only the one unit to record each pair of two channels, and the same one unit to read the data back. -Thinking about it, it's by no means certain that there's a "read-back" input on the mastering delay connector... -It's possible that the delay device might also contain the second (identical) converter circuit... -this would remove the need to buy a second encode/decoder, with all it's 'wasted' redundant input circuitry...To know the answer to that question, you'd need to know more about the delay option, or have information on the pin-out of the interface connector.
I would be curious to know what the nearest integer multiple of the NTSC line frequency (15.xxxxkHz, instead of the much lower frame rate of 29.97Hz) to the sample rate/bit rate would be... this might give a clue as to how they're synchronising the whole affair...
About this point any knowledge I might have is already shared... from here on, it would be detective work, conjecture and guesswork!
I know that what you're looking into would be beyond my abilities, but even failed efforts usually turn out to be quite educational! -If you're not the type of person to get too frustrated with a lack of progress (and you have plenty of time on your hands for a 'project'!) then by all means investigate away! -If you're not known for patience and have a calendar with more ink than white spaces on it, then perhaps it's time to clear a spot on a shelf in the pro-audio museum for the DBX's ;-)
Good luck... -if by some stroke of genius you get anything to store & retrieve, I'd be delighted to know about it!!!
Keith
Follow Ups:
Keith,
Ok, on paragraph seven, got it, that's what I thought, but wanted clarification, thanks. I agree with you that there may not be a 'read back' on the port, but I've been refreshing my self on the use of the break-out box to see what sex this little beasty is and determine the hand-shaking involed. I'll approach it as a puzzle, it should be fun.
Using the 700s with the video ins & outs is the way it was intended to be used and that maybe the best way to utilize them.
I'm now investigating the use of DDRs, (Digital Disk Recorders) which claim a frame by frame lossless accuracy. I'm just learning about them, seem to have different forms of compression and even no compression formats. Depending on their cost it might be a way to go, but dunno yet.Thanks for all your input, you are a asset to this forum and appreciate your involement. I will post results in the future.
Rick
Just figured out that 29.97 (frames per sec.) x 525 (lines per frame) = 15.734.25 kHz... -NTSC line frequency -unless someone can correct me on that- I hope that's correct. (Never was keen on video, and coming from Britain, I was just getting the hang of PAL...!!!)Keith
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