METHOD AND APPARATUS FOR MITIGATING FEEDBACK IN A DIGITAL RADIO RECEIVER

摘要

Embodiments of an acoustic feedback suppressor determine the energy in each of a plurality of frequency bands of frames of an audio signal. The energy in each of the plurality of frequency bands is compared to characteristic of human voice to determine that a present frame contains content that is not likely human voice and exhibits a characteristic of feedback. Upon determining that feedback is occurring, an adaptive gain reduction is applied to the band in which feedback is suspected to be occurring.

主权项

1. A method for mitigating feedback in a radio, comprising:
receiving, at the radio, an audio signal; generating a digital audio signal from the audio signal, the digital audio signal formatted in a series of frames; determining an energy level in each of a plurality of frequency bands of the digital audio signal; calculating at least one ratio of a signal energy level of a first frequency band of the plurality of frequency bands to a signal energy level of a second frequency band of the plurality of frequency bands; determining that the at least one ratio exceeds a threshold; determining, based at least in part upon determining that the at least one ratio is not consistent with a voice signal, that feedback is occurring in one of the plurality of frequency bands; and applying a gain reduction to the frequency band in which feedback is occurring.