Methods And Apparatus For Adaptive Gain Control In A Communication System

摘要

Methods and apparatus for a communication system having microphones and loudspeakers to determine a noise and speech level estimate for a transformed signal, determine a SNR from the noise and speech level estimates, and determine a gain for the transformed signal to achieve a selected SNR range at a given position. In one embodiment, the gain is determined by adapting an actual gain to follow a target gain, wherein the target gain is adjusted to achieve the selected SNR range.

主权项

1. A method, comprising:
for a communication system having microphones and loudspeakers, transforming a signal received by a first one of the microphones to the frequency domain; determining a noise level estimate for the transformed signal; determining a speech level estimate for the transformed signal; determining a SNR from the noise and speech level estimates; and determining a gain for the transformed signal to achieve a selected SNR range at a given position, wherein determining the gain comprises:
adapting an actual gain to follow a target gain, wherein the target gain is adjusted to achieve the selected SNR range;comparing the target gain and the actual gain to determine a gain change increment;increasing the actual gain if the SNR at the given position is lower than a minimum SNR in the SNR range; anddecreasing the actual gain if the SNR at the given position is higher than a maximum SNR in the SNR range.