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Audio signal processing

An audio signal and audio output technology, applied in signal processing, microphone signal combination, speech analysis, etc., can solve problems such as difficulty in echo attenuation, and achieve the effect of accurate compensation

Active Publication Date: 2013-03-13
MICROSOFT TECH LICENSING LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] On the other hand, accurately compensating for echo attenuation by the beamformer in AEC becomes more difficult when no internal information is available

Method used

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  • Audio signal processing
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Embodiment Construction

[0046] Preferred embodiments of the invention will now be described, by way of example only. It may be desirable to implement both the beamformer and the echo canceller at the device, for example for teleconferencing applications. In the following embodiments of the invention, techniques are described that allow the use of beamformers and echo cancellers together without limiting the beamformer type or beamformer behavior and without affecting the performance of the echo canceller, This is true even when no internal access to the beamformer is available.

[0047] This means that even without internal access to the beamformer, the design of the beamformer can be changed without updating the AEC integration. It also allows collaboration with third-party beamformers.

[0048] The beamformer can be modeled as follows. The purpose of a microphone beamformer is to combine several microphone signals in order to produce a beamformer output. The beamformer output may comprise many ...

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Abstract

In one embodiment, a method for processing audio signals in an apparatus includes the steps of receiving audio signals from a plurality of microphones of the apparatus; processing at least one of the audio signals received from the plurality of microphones to generate a first characteristic; applying a beam generator cofficient by a beam generator to the received audio signal so that output of the beam generator is generated; and processing the output of the beam generator to generate a second characteristic. An echo eliminator is applied to the output of the beam generator, thereby inhibiting echo caused by the audio signal output from an audio output end through the output of the beam generator. A relation between the first characteristic and the second characteristic is utilized to determine an operation parameter of the echo eliminator.

Description

[0001] related application [0002] This application claims priority under 35 U.S.C. §119 or 365 to British Application No. GB ​​1119932.0 filed November 18, 2011. The entire teaching of the above application is hereby incorporated by reference. technical field [0003] The invention relates to processing audio signals received at a device. Background technique [0004] A device may have an audio input device such as a microphone that can be used to receive audio signals from the surrounding environment. For example, a microphone of a user device may receive primary audio signals (eg, voice from a user) as well as other audio signals. The other audio signal may be an interfering audio signal received at the device's microphone, and may be received from an interfering source or may be external background noise or the microphone's own noise. The interfering audio signal may disrupt the primary audio signal received at the device. A device may use received audio signals for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/02G10L21/0208H04M9/08
CPCH04R2430/20H04R3/005H04R3/02
Inventor K.V.索伦森
Owner MICROSOFT TECH LICENSING LLC