Method and apparatus for acoustic echo control

摘要

Embodiments of method and apparatus for acoustic echo control are described. According to the method, an echo energy-based doubletalk detection is performed to determine whether there is a doubletalk in a microphone signal with reference to a loudspeaker signal. A spectral similarity between spectra of the microphone signal and the loudspeaker signal is calculated. It is determined that there is no doubletalk in the microphone signal if the spectral similarity is higher than a threshold level. Adaption of an adaptive filter for applying acoustic echo cancellation or acoustic echo suppression on the microphone signal is enabled if it is determined that there is no doubletalk in the microphone signal through the echo energy-based doubletalk detection, or there is no doubletalk through the spectral similarity-based doubletalk detection.

主权项

1. A method of performing acoustic echo control, comprising:
performing an echo energy-based doubletalk detection to determine whether there is a doubletalk in a microphone signal with reference to a loudspeaker signal; calculating a spectral similarity between spectra of the microphone signal and the loudspeaker signal; determining that there is no doubletalk in the microphone signal if the spectral similarity is higher than a threshold level; and enabling adaption of an adaptive filter for applying acoustic echo cancellation or acoustic echo suppression on the microphone signal if it is determined that there is no doubletalk in the microphone signal through the echo energy-based doubletalk detection, or there is no doubletalk through the spectral similarity-based doubletalk detection, wherein the calculation of the spectral similarity comprises: calculating each of the spectra as a spectral vector including elements representing signal magnitudes on a set of perceptually spaced bands, or on a set of frequency bins of the corresponding signal; and calculating the spectral similarity as similarity between the spectral vectors, wherein the step of calculating and the step of determining are performed only if it is determined that there is a doubletalk through the echo energy-based doubletalk detection.