Patent ID: 8811624

Claim:
An echo cancellation method, comprising: dividing, by performing Quadrature Mirror Filter (QMF) analysis filtering, an audio signal to be processed into a high-band audio signal and a low-band audio signal; performing adaptive filtering on the low-band audio signal, and performing QMF synthesis filtering on a signal obtained after the low-band audio signal undergoes the adaptive filtering, and performing the QMF synthesis filtering on the high-band audio signal to generate a preliminary echo cancellation signal; performing envelope predication echo suppression on a high-band signal in the preliminary echo cancellation signal, and calculating and outputting a residual echo suppression coefficient; performing echo suppression on a low-band signal in the preliminary echo cancellation signal, and outputting a processing result; and multiplying an output result by the residual echo suppression coefficient, and outputting a signal, wherein echoes of the signal are canceled.