公开(公告)号：US20180048420A1

公开(公告)日：2018-02-15

申请号：US15236025

申请日：2016-08-12

Applicant: Google Inc.

Inventor： Tina le Grand ,  Niklas Blum ,  Minyue Li ,  Henrik Lundin ,  Michael Tschumi ,  Alexander Narest

IPC: H04L1/00 ,  H04W24/08

CPC classification number: H04L1/0007 ,  H04L1/0009 ,  H04L1/0014 ,  H04L1/0015 ,  H04L1/0033

Abstract: Control logic determines when a network condition has changed by evaluating network condition data. Based on a detected network condition change, the control logic reorders an encoder parameter controller execution sequence of a plurality of encoder parameter controllers. The control logic configures the plurality of reordered encoder parameter controllers so that an encoder parameter determination from a prior encoder parameter controller is used as a decision input for a subsequent encoder parameter controller. An encoder encodes data, such as audio data, video data or other type of data using the generated encoder control parameters from the reordered plurality of encoder parameter controllers. A related method is also disclosed.

公开(公告)号：US10129408B1

公开(公告)日：2018-11-13

申请号：US15290959

申请日：2016-10-11

Applicant: Google Inc.

Inventor： Per Åhgren ,  Ivo Creusen ,  Tina le Grand

IPC: H04M9/08 ,  H04B3/23

Abstract: Methods and systems detect residual echo in an audio signal in a non-causal manner. A non-causal residual echo detector allows accurate detection of any residual echo from an AEC (acoustic echo canceller). The non-causally detected residual echo may be utilized to perform various actions such as selecting between different causal AECs, tuning a causal AEC, and/or characterizing the performance of the causal AEC. Aspects leverage an understanding that the information about residual echo being present in a signal does not have to be causal in the sense that it is acceptable and even advantageous to know some time afterwards (e.g., after a signal has undergone acoustic echo cancellation and is output for further processing or transmission) that a residual echo was present in the signal. Such an approach is different from the case of an AEC, which needs to know right away, with a fairly low signal delay involved, whether residual echo is present.