How FM receiver decide channels frequency?

calculate the carrier frequency. i don't understand you quite wll,the above is just my opinion.

calculate the carrier frequency.

Thanks, I want to know FM recevier can do auto channel selection.

How it know this frequency has a station.

Due to FM get a main tone ? so if FM player can do auto channel selection that means it is calculating its tone ?

Boki.

No. It weights the high frequency noise after the FM discriminator.

All that needed is HPF, detector and comparator. That is already included in the receiver IC.

Vladimir Vassilevsky

DSP and Mixed Signal Design Consultant

Look for RSSI

Don't know about the audio "quality" - FM is mostly political-extremist talk radio nowadays.

Now for a technical answer. What I would do is look for a strong pilot tone at 19 khz in the IF product. Technically, that will only be transmitted by stations providing compliant FM stereo, but I think all US FM stations are stereo by now.