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In Reply to: RE: Suggestion........ posted by cfraser on July 13, 2014 at 10:24:29
It seems plausible that what is going on in the computer will have less effect on the sound if the computer is physically and electrically very distant from any of the analog equipment. But then, a more complex playback chain will have more complex failure modes. I suggest somehow capturing the bits that are going to the DAC and verifying that they correspond to the bits on the CD. If you use SPDIF to the DAC you can connect the cable to a digital in of a separate computer and record the stream. There may be various "loop back" tricks available that don't require extra hardware, but these won't catch all the possible places where the bits could get corrupted. IMO it is a complete waste of time to do anything regarding subjective sound quality of computer audio until one has first verified that the correct bits are actually making it to the DAC.
There have been threads regarding the effect of FLAC to WAV conversion and impact on headers. There have also been threads discussing the effect of offset errors on digital sound files. There have also been threads on how two bit-identical files might sound different.
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
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Unfortunately I don't have a computer with a general (audio) digital input, except USB. So I'd have to get some interface gadget and use USB somehow.
I didn't realize those topics you mentioned at the end there were the same thing as the header "problem". FWIW I don't notice a sonic diff between WAVs and FLACs, and the diff would have to be get significant before I'd be willing to give up the tagging flexibility/convenience of FLACs. Compared to the playback limitations of tagged WAVs, not worth it to me.
I really think that just a plain old hex editor with search mode will be sufficient for a basic test. Just search on a pattern given some offset and see if you can locate the similar pattern on the next bitstream at the same location. Trying to CAPTURE SPDIF info would be trickier IMO as the interface may always be transmitting SOMETHING such as some control signal to just wait for the sample to arrive.
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