公开(公告)号：US20140112466A1

公开(公告)日：2014-04-24

申请号：US13657908

申请日：2012-10-23

Applicant: CISCO TECHNOLOGY, INC.

Inventor： Feng Bao ,  J. William Mauchly ,  Subrahmanyam Kunapuli ,  Xiangyu Bao

IPC: H04M9/08 ,  H04B15/00

CPC classification number: H04R1/2869 ,  H04M9/082

Abstract: Clock synchronization for an acoustic echo canceller (AEC) with a speaker and a microphone connected over a digital link may be provided. A clock difference may be estimated by analyzing the speaker signal and the microphone signal in the digital domain. The clock synchronization may be combined in both hardware and software. This synchronization may be performed in two stages, first with coarse synchronization in hardware, then fine synchronization in software with, for example, a re-sampler.

Abstract translation: 可以提供具有通过数字链路连接的扬声器和麦克风的声学回声消除器（AEC）的时钟同步。 可以通过分析数字域中的扬声器信号和麦克风信号来估计时钟差。 时钟同步可以在硬件和软件两者中组合。 该同步可以分两个阶段执行，首先是硬件中的粗略同步，然后在软件中与例如重新采样器进行精细同步。