Conference cookie::notes$archive:cd_v1

I am a bit skeptical of a system which claims to fit an hour of digital
music on a floppy disk.  Assuming the same sampling rate as for CDs:

44,100 (bits/sec) * 3600 (sec/hour) = 158,760,000 bits/hour

That's about 20 megabyte - Possible on a hard disk, but on a floppy?

				Paul

	YOU WON'T GET ANY ARGUMENTS FROM ME.

1200 will buy roughly 85 to 90 CD's.  I would rather make up a mega library
of CD's than a floppy coppy of an album.  And beside that, imaging the
other equipment needed to do the format justice.  You can't use a Radio Shaft
mike and mixer and expect to get good results of home recorded stuff.  Then
there is the problem of media wear...

Next major break-through....

I would like to see someone invent a computer terminal with no KB so I can
save my fingers..

BML

.1 has the numbers wrong.  you forgot to multiply by 16 bits per
sample and 2 samples per period.  The 44,100 is periods per second,
not bits.

So 44,100 * 16 * 2 * 3600 = 635 Megabytes.

I read something a while ago that was about sampling, but only reflecting the
change since the last time.  in this way the amount of data necessary to
produce music would be decreased.

I also thought I read something about the recorder in question, something
to the effect that to "fool" the ear into thinking it hears music is easy, and
that the amount of data now being used could be significantly reduced, while
still providing high quality audio.  It was in some RAG, and I'll look it up
tunite.

BML

	There is an article on the CompuSonics DSP-1000 in the December,
1984 Stereo Review. What is most interesting about the device is that
they have an algorithm to convert the data input stream into "only the
data necessary for a subjective accurate reproduction of the signal". As
a result, they have cut the data requirement from 1441K BPS to 160K BPS!
The unit demoed last october had a recording time of 3-4 minutes in
mono. They are depending on a higher density floppy to get a full lp in
stereo, as well as improvements in their signal processing algorithm.
What is most interesting anbout this process ids that it is not limited
to use in an audio recorder. It could be used for broadcast over a small
bandwith, music synthesizers, and even computer audio processing (like
PRO TMS) 

	The big "problem" that I see with the unit, is that noone will 
want to make recorded material available for it, as pirating will be 
much too easy

COMPUSONICS uses similar methods to audio as what is done in computers
for file compression, e.g. removing all the "blanks" and replacing the
with the number removed, etc... About removing the KB though, Someone
invented a keyboard that had 5 keys, one per finger, and letters were
entered as combo's of keys. You can really cruise along if you know the
combo's but the learning process is slow ( perhaps even more tedious
than typing on a normal KB ).  Personally, I'm waiting for an RS232ST
standard ( ST stands for Spinal Tap )!

Thank you NOTES-11. It seems by response wasn't as complete as I thought.
Here is what I WANTED to say:

In a recent issue of High Fidelity (The one with the CAR STEREO license
plate on the cover), they talked a bit about the mobile version of the
floppy player. It seems that it isn't looking TOO good, but people are
still waiting to see what they can do with it.

As for an RS232ST, check out the book NEUROMANCER by William Gibson. If you
like High-Tech punk, you'll love it. Also, check out TRUE NAMES by Vernor
Vinge. Both feature interesting Human Interfaces!

Say Hi to the Dixie Flatline.
DDA