I see you mention 10KHz for a sample rate.  The standard telephone sample
rate is 8KHz, and in fact the bandwidth is limited to around 3.3KHz.  I
agree with Morgan Olsson that delta-sigma or adaptive-delta would be the
easiest to implement on the PIC.  Most other compression algorithms give
you slightly more compression with LOTS more work.

On Sunday, March 08, 1998 8:52 PM, Danjel McGougan
[SMTP:danmc458@STUDENT.LIU.SE] wrote:
> Hi all,
>
> I'm thinking of building a digital telephone answering system. What I
> really want to know is if there are any good audio compression
> algorithms that I can use.
>
> I'll be using a PIC processor preferably with a multiplication
> instruction. The algorithm can't be too complex because you need to
> compress the data in real time (8 bits, say 10kHz).
>
> Is this possible or are you better off just storing the audio data
> uncompressed? What do you think?
>
> Regards, Danjel McGougan.
>