If you want to get cheap and dirty, a couple of 567 tone decoders would
work too.

The JRC 2211 is $1.85 CAN at Digikey.  The 567s are about the same price
for two, but I have about 50 of them in my junk box!

Craig

> -----Original Message-----
> From: atmel-request@pic.co.za [mailto:atmel-request@pic.co.za]On Behalf
> Of Tom Wyckoff
> Sent: December 13, 1999 4:24 PM
> To: atmel@pic.co.za
> Subject: Re: FSK signals
>
>
> Check out the JRC 2211, a single chip fsk decoder.  Basically it's part
> of a modem chip, without all the baggage of framing and Start & stop
> bits.  Gives you a 1 for one frequency and a 0 for the other.  Less than
> $2.00 U.S.
>
> TW
>
> Mandilas Antony wrote:
> >
> > Hello everybody. Has anyone ever worked with FSK signals. These are the
> > incoming signals a telephone comapny sends when you have an ISDN line
> > and if you decode them correctly you can see the number of the person
> > who calls you. I wander if i could do this decoding with an AVR. If
> > anyone knows somthing or knows a link where i could learn more please
> > send me a message
> >
> > Best reagards
> > Mandilas Antony