Patent ID: 9136905
Filing Date: 2015-09-15
Classification: H04B,H04M

Abstract:
1. A multi-receiving terminal echo cancellation method suitable for use in a communication apparatus comprising M receiving terminals, M being a natural number greater than or equal to 2, the method comprising performing echo filtering on receiving terminal signals in M channels by means of echo filters to obtain filtered receiving terminal signals in M channels, and subtracting the filtered receiving terminal signals in M channels from a sending terminal signal to obtain a system output signal in which receiving terminal echoes have been cancelled; and buffering the receiving terminal signals in M channels by means of buffers at the same time, calculating a decorrelation matrix according to each of the receiving terminal signals in M channels that are buffered within a preset length, decomposing the buffered receiving terminal signals in M channels into decorrelated receiving terminal signals in M channels by means of the decorrelation matrix, and calculating update amounts of the echo filters according to the decorrelation matrix, the decorrelated receiving terminal signals in M channels and the system output signal that is fed back.