公开(公告)号：US12231602B2

公开(公告)日：2025-02-18

申请号：US17747110

申请日：2022-05-18

Applicant: Nokia Technologies Oy

Inventor： Carl Nuzman ,  Shirin Jalali

IPC: H04M9/08 ,  H04R3/00 ,  H04R3/12

Abstract: An AEC system can implement different updating techniques for echo cancellation. A Block Maximum Likelihood updating technique updates filter coefficients typically at integer multiples of a block size. A Proportional-Incremental Maximum Likelihood updating technique applies proportional weighting to the updates of filter coefficients. A Multi-source Incremental Maximum Likelihood updating technique uses separate control parameters associated with each of multiple loudspeakers. Combinations of these may be used, and one or more of these can be selected and implemented in real-time.

公开(公告)号：US11863702B2

公开(公告)日：2024-01-02

申请号：US17393904

申请日：2021-08-04

Applicant: Nokia Technologies Oy

Inventor： Carl Nuzman ,  Shirin Jalali

IPC: H04M3/00 ,  H04M9/08

CPC classification number: H04M3/002 ,  H04M9/082

Abstract: Echo cancellation for a two-way audio communication includes receiving, at an AEC system from microphone(s), an audio signal based on, at least in part, near-end signals and reproduced far-end signals. Loudspeaker(s) reproduced the far-end signals. The AEC system is operated, at least in part, with filter(s) so as to update estimates of coefficients of an acoustic channel from the loudspeaker(s) to the microphone(s). Control parameter(s) affecting an operation of the AEC system that is/are configurable and is/are set to value(s), from a range of values, is/are determined, based on estimating an accuracy of the estimates of the coefficients of the acoustic channel and a characteristic of the near-end signals. The AEC system controls the filter(s) with different values of the control parameter(s) at different times.