Method and system for suppressing receiver audio regeneration

Details Method and system for suppressing receiver audio regeneration Method and system for suppressing receiver audio regeneration

2007-10-09

2007-10-09

Hudspeth, David (Department: 2626)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

C704S205000, C704S270000, C455S151200, C381S093000

Reexamination Certificate

active

11241351

ABSTRACT:
The invention concerns a method (500) and system (100) for suppressing receiver audio regeneration. The method (500) includes the steps of receiving a communication signal (502), at a Radio Frequency (RF) unit (102), demodulating the communication signal to an audio signal (504), monitoring a volume level of the audio signal (506), and shifting the pitch of the audio signal when the volume level reaches a predetermined threshold (508), and playing the pitch-shifted audio signal out of a speaker to produce a pitch-shifted acoustic signal (510). The method can shift the pitch of the audio signal to produce a pitch-shifted acoustic signal with signal properties suppressing regeneration of the acoustic signal onto the audio signal at the RF unit. The amount of pitch-shifting can be a function of the volume level.

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Schroeder, M.R. “Improvement of Acoustic-Feedback Stability by Frequency Shifting,” The Journal of the Acoustical Society of America, vol. 36, No. 9, Sep. 1964.

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