Using Pic to listen to audio tones from car radar detector

So i have Uniden R1 radar detector. This unit as well as many others has an audio output port for external speaker. I would like to feed that output to a pic to read the different tones for the bands K/Ka/Laser. each band having a different tone. I will use a PIC 16F628A (16F877A if i need more ports).

Thanks.

I would try building a voltage comparator and feeding the audio into it producing a square wave then reading the frequency.

What exactly you need the PIC to do? Produce an discrete output for every tone?

If yes, maybe Capture Compare could help with this.

Ioannis