On Tue, 8 Nov 2005 15:07:41 +0000 (UTC), chesucat
said in rec.radio.scanner:

"A discriminator is a circuit that voice-band filters the base-band audio
coming out of the FM detector, so that the audio coming out of the speaker
and headphone jack sounds good."

Whoever you're quoting should first have learned what a discriminator
does. That's not it.