Conference cookie::notes$archive:cd_v1

91.0. "CompuSonics' Floppy Music box" by FRSBEE::LAMBERT () Wed Mar 06 1985 09:41

I found the article on the CompuSonics floppy disc music system.  While this
is a pretty long article, I will enter the key points here for further talk
about the idea.

Taken from December 1984, STEREO REVIEW with no permission...(go ahead, sue..)

Compusonics has developed a music system where 1 hour of music may be recorded
on what they call a 'Super floppy' that will hold (so they say) roughly 50
megabytes of information.  "Putting it too simply, from a pair of normal line
inputs, teh DSP-1000 generates a typical digital-audio signal (16-bit linear PCM
as used in pro digital-audio recorders and the CD system), but it records on
the floppy disc only the data necessary for a subjectively accurate reproduction
of the signal."

....

"In the DSP-1000 the job of deciding what is absolutely necessary to preserve
and what can be safely left unrecorded is given to several Texas Instruments
TMS320-series signal processing microcomputers."
(They claim to have programmed these TMS320's to duplicate the psychoacoustics
of the human ear..)

"...during cd playback the audio data stream off the disk (is read) at the rate
of 1,411,200 bits per sec. ....the production model id expected to achieve a
rate of only 160,000 bits per sec."

On with the war....

BML

Sounds like more hi-tech voodoo.

I'll believe it when I hear it.

--- jerry