Ambient noise compensation system robust to high excitation noise

摘要

A speech enhancement system controls the gain of an excitation signal to prevent uncontrolled gain adjustments. The system includes a first device that converts sound waves into operational signals. An ambient noise estimator is linked to the first device and an echo canceller. The ambient noise estimator estimates how loud a background noise would be near the first device before or after an echo cancellation. The system then compares the ambient noise estimate to a current ambient noise estimate near the first device to control a gain of an excitation signal.

主权项

1. A noise compensation method, comprising:
estimating how loud a background noise resulting from an excitation signal played over a speaker into an acoustic environment would be in a signal captured by a microphone in the acoustic environment; generating an ambient noise estimate associated with the acoustic environment; performing a comparison between the background noise estimate resulting from the excitation signal and a threshold based on the ambient noise estimate; and controlling a gain of the excitation signal based on a result of the comparison; where the estimate of the loudness of the background noise comprises estimating a coupling factor value that represents a ratio of the excitation signal magnitude to an error signal after a filtering stage of an echo canceller.