Apparatus and method for suppressing feedback

Details Apparatus and method for suppressing feedback Apparatus and method for suppressing feedback

2005-02-08

2009-12-01

Mei, Xu (Department: 2614)

Electrical audio signal processing systems and devices

Feedback suppression

C381S083000, C381S095000, C381S096000

Reexamination Certificate

active

07627129

ABSTRACT:
An apparatus for suppressing feedback in an environment where a microphone and a loudspeaker are located, comprises a means for embedding a test signal into a loudspeaker signal, a microphone signal or a modified microphone signal, preferably by using a psychoacoustic masking threshold by using a pseudo-noise test signal, a means for determining a characteristic of a transmission channel in the environment between the loudspeaker and the microphone by using the embedded test signal and the microphone signal, a filter for filtering the loudspeaker signal to obtain a filtered loudspeaker signal, wherein the filter is adaptable to be adapted with regard to its filter characteristic to the characteristic of the transmission channel by the means for determining, as well as a means for subtracting the filtered loudspeaker signal from the microphone signal to obtain the modified microphone signal, in which the feedback is reduced due to the loudspeaker signal. The feedback suppression concept provides an effective feedback suppression without audio quality loss, by which particularly an artist is not affected in his artistic performance.

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