Push-to-talk system with enhanced noise reduction

Details Push-to-talk system with enhanced noise reduction Push-to-talk system with enhanced noise reduction

2006-12-14

2009-11-10

Trinh, Tan (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

With wave collector

C455S296000, C455S307000, C455S518000, C455S063100

Reexamination Certificate

active

07616936

ABSTRACT:
Methods and apparatus for reducing the effect of surrounding noise in a push-to-talk (PTT) system are disclosed. In one embodiment, a method includes obtaining a first media stream using a microphone when a PTT functionality of a PTT communications system is in a first state, and identifying a first set of characteristics associated with noise in the first media stream. The method also includes obtaining a second media stream using the microphone that includes the noise and a first sound when the PTT functionality is in a second state. A second set of characteristics associated with the first sound in the second media stream is identified, and parameters associated with a filtering arrangement are determined using the first and second sets of characteristics. Finally, the method includes applying the filtering arrangement to the second media stream to filter out the noise such that a communications stream is created.

REFERENCES:
patent: 4905305 (1990-02-01), Garner et al.
patent: 6647367 (2003-11-01), McArthur et al.
patent: 2004/0203454 (2004-10-01), Rogers
patent: 2005/0227657 (2005-10-01), Frankkila et al.
patent: 2008/0140427 (2008-06-01), Rambo et al.

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