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Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it.

RE: Agree with you-even if you

"Currently I am annoyed that neither Audition or Wavelab 7 will rip audio from mpeg2 or vob, which Audition is supposed to be able to do. Read web claims and it should be possible. Read how and the instructions are wrong."

I suggest you convert your files before editing them. It could be worse. Your software could open the files and attempt to edit them, but then garbage up the edits. That's probably not what will happen, but it did happen to me when editing FLAC files using a version of Soundforge. It took me a while to learn not to use Sounforge to edit any file formats except WAV files.

If you want to know exactly what your software is doing, then this will be impossible unless you reverse engineer the program (e.g. using a Hex editor) and life is far too short for this level of effort. However, it is possible to see how various functions work, because all audio editors come with the ability to examine waveforms in detail down to the individual sample level, as well has having built in test generation software, spectrum analysis, etc... With some knowledge of signal processing it is possible to measure what various software (e.g. sample rate converters) do to music files in gory detail. Indeed, experience has shown that if you do not do this vetting you will probably not get good results out of most audio editor software.

The situation with IBM library routines does not surprise me, based on my experience a long time ago running benchmarks. At Digital Equipment in the 1970's there was a woman in the Research Department who was in charge of "computational quality" and it was her job to ensure that all of processors and software library routines gave correct results, down to a fraction of a bit. (Where the true answer was in between two possible floating point numbers, the "correct" version is the particular number that is closest to the actual answer.) She contacted me one time to complement me on the PDP-10 square root routine that I had written, because it made the correct rounding decision in every possible case. (Something that I was well aware of, because I had tested every possible number to verify that the square root was calculated correctly. I wasn't about to have a bridge collapse on account of one of my programming bugs.)

Tony Lauck

"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar


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