公开(公告)号：US10530936B1

公开(公告)日：2020-01-07

申请号：US16354565

申请日：2019-03-15

Applicant: MOTOROLA SOLUTIONS, INC.

Inventor： Vahid Khanagha ,  Kurt S. Fienberg

IPC: H04M9/08 ,  H04R3/04 ,  G10L25/21 ,  H04R3/02

Abstract: Systems and methods for acoustic feedback cancellation. One method includes transmitting, with a transceiver, a known full-band sequence at a first time. The method includes receiving, via a microphone, a received audio signal including a received copy of the known full-band sequence. The method includes filtering the received audio signal to generate a filtered audio signal, and detecting, based on the filtered audio signal, a second portable communication device in proximity to the portable communication device. The method includes, in response to detecting the second portable communication device, determining, based on the first time and filtered audio signal, an estimated loop delay. The method includes initializing an adaptive feedback cancellation filter based on the estimated loop delay and the plurality of estimated filter coefficients. The method includes determining a plurality of estimated filter coefficients based on the known full-band sequence and the received copy of the known full-band sequence.