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Rip losslessly to flac with abcde
Not really true -- a true square wave has infinite frequencies (or at least higher than the sampling rate and your range of hearing), which any encoder (even "lossless" WAV) will alias to lower frequencies that you "can" hear. So if one encoder suppresses these alias frequencies better it doesn't make it more "lossless" -- you've simply passed data to the encoder that the writes didn't expect -- non-audio data.
Rip losslessly to flac with abcde
Yes, it really is true. I'm talking about the codec being lossless. If the audio samples coming out match the audio samples that went in, it's lossless. You're talking about the sampling process being lossy, which of course is true, but it's a totally different issue.
Rip losslessly to flac with abcde
The thing the codec is trying to be smart about is to work with audio that really will come along. If the inventors of a codec realize through analysis of real audio that certain frequencies never come up in real life, then develop a codec that takes advantage of that truth of nature they may have an insight that allows a significant advance in technology. So if it is lossless with real audio but loses certain frequency components in fantasy signals I would still call it lossless.
Rip losslessly to flac with abcde
"Lossless compression" means no information is thrown away.
MP3 and FLAC are analogous to JPEG and GIF, or ZIP. JPEG and MP3 throw away information that is considered unimportant, or below our threshold of detection. FLAC, GIF and ZIP should take some binary stream and compress it in a way that that stream can be recovered PERFECTLY. Arguing about square waves misses the point -- FLAC can encode any valid PCM stream and reproduce it bit for bit on decompression. The sampling process that makes a true square wave impossible is not the issue here. D. |
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