[PIC] FSK demodulation

I've been playing with AFSK demodulation (project at
https://w6iwi.org/rtty/DspTU3/ ). I'm currently using biquad
bandpass filters for mark and space, then comparing the level out of each
to determine whether I am receiving mark or space. I also adjust the
mark/space threshold based on the last received mark or space level to
allow for selective fading.

I've also heard of using the Goertzel algorithm to detect the mark and
space tones.

Is there an advantage to one or the other?  The biquad filters seem pretty
simple and operate on a sample by sample basis (instead of a block of
samples).

Thanks!

Harold
https://w6iwi.org




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