[vorbis-dev] Using large-scale repetition in audio compression

Lourens Veen lourens at rainbowdesert.net
Thu Sep 19 03:44:42 PDT 2002

This idea is so simple that I'm sure it must have been thought of 
before, and discarded, since AFAIK it's not used anywhere. I did a 
quick web search but that didn't turn up much, so I figured I'd put 
it up for discussion here anyway.

How about using large-scale repetition in audio compression? I'm 
thinking of redundancy in repeated pieces of a song, ie a chorus. 
Ofcourse, the different choruses aren't exactly the same (unless it 
was mixed digitally and they cheated :-)), but wouldn't there be at 
least some redundancy in the frequency domain? And could that be 
used to lower the required bitrate for repeated parts of a song?

Ofcourse this is hard to do when streaming live audio, or even when 
streaming from a fixed source if you don't buffer the entire 
broadcast on the client side, but for compressing a song from a CD 
I'd say that it would work.

Obviously, it's not used (at least AFAIK) so there must be something 
against it. Anyone care to enlighten me?


GPG public key: http://home.student.utwente.nl/l.e.veen/lourens.key

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