Salym,
DSP - Digital Signal Processors are generally designed to replace ana=
log
functions as close to the signal source as possible (hence Analog Dev=
ices
involvement). Ideally, this means the signal source, an ADC and then =
the
DSP.  DSPs can produce very repeatable filters, demodulators, phase l=
ocked
loops, multipliers, and many other signal processing functions in a v=
ery
efficient cost effective system.  Almost all cell phones and modems u=
se DSPs
and they are embedded in a wide variety of products.  Speech processi=
ng is a
natural.

The architecture is similar to a PIC in that they use highly parallel
operation commonly called Super Harvard Architecture.  Typically they=
 can
get an instruction and two data words in one clock cycle.  Multiplies=
 are in
one instruction cycle.  Newer chips can do much more and often have v=
ariable
word length.  By way of comparison, more traditional microprocessors =
perform
instructions sequentially and often require more than one cycle.  Mem=
ory
fetches are usually not in parallel.  Nevertheless, the line is blurr=
ing
between DSPs and traditional microprocessors.  For instance, Analog D=
evices
and Intel recently teamed to develop a DSP/microcontroller core aroun=
d which
each company would market specialty "flavors".

There are many ways to create your system, some are novel and unique,=
 but in
my opinion the most flexible nail-on-the-head winner is a DSP.

http://www.digikey.com popular hobbyist, prototype quantity supplier
http://www.ti.com Texas Instruments makes DSP chip
http://www.analog.com Analog Devices makes DSP chips

-----Original Message-----
=46rom: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Salym Asp.
Sent: Saturday, September 29, 2001 4:00 PM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [PIC]: How to handle Speech with a PC ?


Dans un e-mail dat=E9 du 29/09/2001 19:53:05 Paris, Madrid (heure d'=
=E9t=E9),
robertf@MICROBALANCE.COM a =E9crit :


> I saw something like this to
> help people who stutter. My
> first though was using a
> bucket brigade chip to do the
> delay. Havent thought of the
> shifting. Last I saw the chip
> was at Digikey catalog.
>

Yes you're alright, duing my investigations, I discovered that this c=
ould
help for fluency when you stutter.

Can you tell me more and give me links especially for Digikey?

And What exactly is a DSP chip? what is the main differences with a r=
egular
processor?

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