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Need to analyze a bitstream from a digital out - compare to pcm .wav file

post #1 of 2
2/8/12 at 3:12pm
Thread Starter 

I have a piece of source equipment that will play a flac file.  I need to help my customer understand that the flac file that we're playing is indeed the same as the source pcm .wav file that they provided us.  I know that I could copy the file off, remove the proprietary encryption key, convert it back to wav format and do a CRC compare, but the customer has more trust in this being demonstrated during playback.  Does anyone have a suggestion for how to do this??  I am also trying to avoid recording it and comparing that recording.  

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post #2 of 2
2/8/12 at 8:47pm

If they won't trust the data surrounding lossless encoding and/or you - the designer/integrator/whatever, I'd probably just give up on the entire debate. It's probably a losing battle. Better to let them continue believing whatever they want while keeping them happy.

 

Having said that, there's no "clean" way to do this during playback that I'm aware of, at least that will give you meaningful data. Sure, you could feed the thing into a scope, but I doubt they'd be able to see even huge differences in a realistic way, and even if they could, it's not a very pragmatic solution. A loop-back would work (something like RMAA), but you've said "no" to that idea. 

 

I like the CRC comparison idea (you can actually go another step and have the computer check the files bit for bit), but if they're not going to trust that level of attention (And I applaud you for even putting up with that), as I said before - it's probably a losing battle.

 

 

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