[sdiy] Pulse Width Modulation sampling??

[Steven Downhill]

Hi there,

>I read somewhere out there, about how people used to
>use pulse width modulation to create sort of
>samples/(audio recordings?) for the commodore 64.

Yes this is true, but I believe it's done by Pulse Code Modulation.

Check out the first section called Speech 64 - Digitized Speech Without
Special Hardware at the link below.

http://web.inter.nl.net/hcc/davies/mvmanual.html


This short program which you can type in basic, allows you to record audio
into your C64 via the datasette, and replay it through your TV or audio
output on the back of the C64.
It tends to make everything you record go buzz/clunk when you replay it
though as the resolution is something like 1 Bit 4KHz and it's done with
PCM.
(I have checked the program on one of my real C64s and it works fine.)

Hope this helps.

Regards
Steven - Collector of 70/80s computers, and has far too many of them...

-----Original Message-----
From: Andalong Dudigual [mailto:andalongdudigual at yahoo.com] 
Sent: 03 February 2004 07:24
To: synth-diy at dropmix.xs4all.nl
Subject: [sdiy] Pulse Width Modulation sampling??


Hello everyone,
I read somewhere out there, about how people used to
use pulse width modulation to create sort of
samples/(audio redcordings?) for the commodore 64.
Does anyone know more about this?  Is it possible,
using this technique to create audio samples that play
via analog oscillators?  and what exactly is the
difference between pulse width modulation and pulse
code modulation (as seen written on old casio's and
the like)
 

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