Method and apparatus for receiving and playing a signal in a radio receiver

摘要

A method and apparatus for receiving and playing a signal in a radio receiver to suppress microphonic feedback are provided by alternately pitch shifting a received audio signal. The pitch of the received audio signal is alternately shifted up and then down, repeatedly over successive intervals of the audio signal, to produce a pitch swing signal which is then played over a speaker. The alternating pitch shifting prevents the buildup of regenerative feedback normally caused by acoustic vibrations coupling into the radio receiver.

主权项

1. A method for suppressing microphonic feedback, comprising:
receiving a radio frequency signal; demodulating the radio frequency signal to produce an audio signal having a nominal pitch; applying an alternating pitch shift to the audio signal by alternatingly applying positive pitch shifts to first portions of the audio signal and negative pitch shifts to second portions of the audio signal to produce a pitch swing audio signal; and playing the pitch swing audio signal.