What is the term for the suppression in an FM receiver of one signal by another stronger signal on the same frequency?
Why FM detectors respond to the instantaneous frequency of whatever signal dominates the limiter stage, so when two signals share a channel the stronger one takes over the detector and the weaker one is largely suppressed. This is the capture effect, and only a few dB of difference is usually enough for the stronger station to completely take the channel. It is a property of FM demodulation and is why you rarely hear two FM stations mixed together the way you do with AM or SSB.
Watch out Desensitization is a different problem: a strong signal on a nearby but different frequency drives the receiver front end toward compression and reduces sensitivity to the desired signal. Cross modulation transfers the modulation of a strong signal onto another carrier.
Capture = same frequency, strongest wins. Desense = nearby frequency, everything gets weaker.