Audio Signal Processing

摘要

An estimated system gain spectrum of an acoustic system is generated, and updated in real-time to respond to changes in the acoustic system. Peak gains in the estimated system gain spectrum are tracked as the estimated system gain spectrum is updated. Based on the tracking, at least one frequency at which the estimated system gain spectrum is currently exhibiting a peak gain is identified. Based on the identification of the at least one frequency, an audio equalizer is controlled to apply, to a first speech containing signal to be played out via an audio output device of the audio device and/or to a second speech containing signal received via an audio input device of the audio device, an equalization filter to reduce the level of that signal at the identified frequency. The equalization filter is applied continuously throughout intervals of both speech activity and speech inactivity in that signal.

主权项

1. A method of reducing acoustic feedback in an acoustic system comprising at least one audio device, the method comprising:
generating an estimated system gain spectrum of the acoustic system, wherein the estimated system gain spectrum is updated in real-time to respond to changes in the acoustic system; tracking peak gains in the estimated system gain spectrum as the estimated system gain spectrum is updated in real-time; identifying based on the tracking at least one frequency at which the estimated system gain spectrum is currently exhibiting a peak gain; and based on said identification of the at least one frequency, controlling an audio equalizer to apply, to a first speech containing signal to be played out via an audio output device of the audio device and/or to a second speech containing signal received via an audio input device of the audio device, an equalization filter to reduce the level of that speech containing signal in a portion of its spectrum that includes the identified frequency, wherein the equalization filter is applied continuously throughout intervals of both speech activity and speech inactivity in that speech containing signal.