Method and device for reducing acoustic feedback

摘要

Acoustic feedback in an audio device is reduced or eliminated via a feedback compensator. The feedback compensator disposes of at least one adaptive filter whose adaptation is governed by a step-size parameter μ. A step-size parameter μ of the adaptive filter is set at a high level to eliminate acoustic feedback and the parameter μ is decreased when a critical excitation signal is detected. This way to proceed allows for efficient elimination of feedback whistling while required environment signals are retained.

主权项

1. A method of reducing acoustic feedback of an audio device by a feedback compensator, the feedback compensator having at least one adaptive filter, the method comprising the steps of:
setting a step-size parameter p of the adaptive filter at a high level to eliminate acoustic feedback; using a feedback detector to detect a critical excitation signal being a tonal signal, wherein the tonal signal is a microphone signal which is received by the feedback detector; and when the critical excitation signal is detected, decreasing the step-size parameter p; wherein the step-size parameter p controls an adaptation speed of the adaptive filter and wherein the step-size parameter p is set at 0.06 or more to eliminate acoustic feedback.