Multiplexing and Compressing Audio????

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2 total messages Started by Maurice Shihadi Mon, 02 Nov 1992 12:17

#55

Author: Maurice Shihadi
Date: Mon, 02 Nov 1992 12:17

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I have an interest in the above topic and would like some possible
bibliographical references from Journal Periodicals or other current
cutting edge sources.  Specifically, I would like to find out what
obstacles are involved with taking nine tracks of digital audio 
information multiplexing it into one stream of data and then compressing
that stream for storage so that later it could be uncompressed and
converted back into nine tracks without any audio degradation of
sound.  What algorythm would be best suited for the compression and
what would be the ultimate ratio of compression?  Also, would there
need to be other considerations in transferring the compressed data file
over ISDN?

Thanks.

maurices

Re: Multiplexing and Compressing Audio????

#60

Author: William Alves
Date: Mon, 02 Nov 1992 20:51

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In article <Bx38sr.H3r@spock.dis.cccd.edu> maurices@spock.dis.cccd.edu (Maurice Shihadi) writes:
>I have an interest in the above topic and would like some possible
>bibliographical references from Journal Periodicals or other current
>cutting edge sources....

I don't know of any lossless audio compression algorithms that will gain
you anything more than about a 5% or so compression (that is, 1.05:1
ratio). There are plenty of lo-fi lossy compression techniques: delta
modulation, mu-law encoding, linear prediction, etc. The only hi-fi
compression technique that I have heard of is the new PASC algorithm
developed by Phillips for use on their digital compact cassette (DCC).
It, too, is lossy, but it acheives a 4:1 compression ratio that is
(according to the writers I've read) almost indistinguishable from
compact disc audio. The details are in Ken Pohlmann's "Insider Audio"
column in Mix magazine for March and April 1992.

Bill Alves

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