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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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In Reply to: Re: 'Unlike software, there are no precise data patterns in music. So I question whether "lossless" can truly be lossles posted by Todd Krieger on February 13, 2006 at 00:41:30:
Y'all asked:
So I can take a non-compressed file, convert it to "lossless" compression, and then back to a non-compressed format, and the resultant data should be identical to that of the original non-compressed file. Is there a way I could personally try this?
---Todd, do you nderstand that a buffer can and should be placed after any decompressor? If there is any, and I mean ANY problem with a lossless codec, you have a bad DAC, bad circuit board design, or bad something going on. The files can, and ARE restored to the same PCM bits. Yes, people have tested this, it's the first requirement for any kind of "lossless" codec, that's what "lossless" means.
Your arguments about RFI could be valid if the board design or DAC have some problems, but this is not the fault of the compressor.
Goodness, back in the day we could get super-90dB dynamic range, so why can't we now?
How can y'all test this? Get a compressor/decompressor pair. Run it from wav. file to wav. file. Write yourself a difference program, compile it, and measure the difference you see after the headers from the wav files.
If you see a difference, it ain't lossless. No more, no less.
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Follow Ups
- Try this... - Silver Eared John 13:46:58 02/13/06 (0)
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