Hi,

there is an AN in the new issue of "Embedded control handbook" with a PIC
of 16C series, and schematic, and theoretical background, etc. etc. I
should search the number but I you need I can.

Regards,

Imre


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On Mon, 13 Aug 2001, Robert Rolf wrote:

> There are various simple compression schemes available. Most use some
> variation of the VSDC method (Variable Slope Delta Compression) wherein
> you store nybbles which contain the deltas between samples (DC), or the
> slope required to get to the next sample (VSDC).
>
> You can also look at thowing away near silence by using an escape
> code and RLL (run lengh limiting) compression as used in Fax machines
> and the like.
>
> Also look at the various formats for compression in WAV files to see if
> one of them meets your needs. (somewhere on
> http://support.microsoft.com)
>
> Robert
>
>
> Tim Crist wrote:
> >
> > Help.
> >
> > I'm trying to reproduce low fi of 300 to 8Khz while using a minimal amount
> > of flash memory to do so.  I also want to keep the code simple, and within
> > the confines of an 8 bit processor if possible.
> >
> > I've looked at MP3 and other compression techniques, but most of them
> > require a large amount of processing.
> >
> > First a sanity check:  If I want 3 minutes of 8 bit sound reproduced with
> > the max freq. of 8Khz I'll get:
> >
> > (180 seconds) * (8 bits) * (16000 pulses/ second) = 23.04 megbits of memory
> > required
> >
> > right?
> >
> > Is there an easy method to half, quarter, or more this audio info to save on
> > memory space?
> >
> > Thanks,
> >
> > Tim Crist
> >
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