Setting gain applied to an audio signal based on direction of arrival (DOA) information

摘要

A method of processing audio signals is disclosed in which the operation of a gain control unit 228 is influenced on a frame-by-frame basis by direction of arrival information 406 produced from a plurality of microphones 402. The method comprises: receiving a plurality of audio signals at the audio input of a user device, the signals including at least one primary audio signal and unwanted signals; receiving direction of arrival information of the audio signals at a gain control means; providing to the gain control means known direction of arrival information representative of at least some of said unwanted signals; processing the audio signals at the gain control means by applying a level of gain to generate a gain controlled signal for transmission to a remote node, wherein the level of gain applied is dependent on a comparison between the direction of arrival information of the audio signals and the known direction of arrival information. The method prevents the automatic gain control (AGC) 228 from adjusting the gain applied to a frame (fig.6) when unwanted signals arrive at the microphone assembly 208 during a call.