Audio signal nonlinear post-processing method and system capable of realizing acoustic echo cancellation

An acoustic echo cancellation, audio signal technology, applied in the direction of two-way sound reinforcement telephone system, telephone communication, interconnection device, etc.

Active Publication Date: 2015-12-16
GOOGLE LLC
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  • Summary
  • Abstract
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  • Claims
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Problems solved by technology

The problem, however, is that after this first stage there is usually still some audible echo in the residual error signal

Method used

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  • Audio signal nonlinear post-processing method and system capable of realizing acoustic echo cancellation
  • Audio signal nonlinear post-processing method and system capable of realizing acoustic echo cancellation
  • Audio signal nonlinear post-processing method and system capable of realizing acoustic echo cancellation

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Embodiment Construction

[0051] The following detailed description of embodiments of the invention will refer to these drawings. The following detailed description is not intended to limit the scope of the invention, which is determined by the appended claims and their equivalents.

[0052] figure 1 The working principle of the acoustic echo canceller (AEC) 100 is illustrated according to an exemplary embodiment of the present invention.

[0053] The AEC100 is a high quality echo canceller designed for voice and audio communications over packet switched networks. Specifically, the AEC 100 is designed to cancel acoustic echoes 130 that are generated by sound waves emitted by the emitting device 10 reflecting back to the proximal capture device 20 from interfaces and other objects. Another reason for the echo 130 is that the path from the emitting device 10 to the capturing device 20 is a direct path.

[0054] Emitting device 10 may be any audio output device, including a speaker or a set of speakers...

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Abstract

The invention discloses an audio signal nonlinear post-processing method and system capable of realizing acoustic echo cancellation. The system includes a non-linear processor (NLP) (104) for receiving the following signals and taking at least two signals as inputs: an upcoming far-end signal and a plurality of capture-end signals; the NLP (104) first For each frequency band, one or more coherence measures between the received signals are calculated, and based on the one or more coherence measures, a corresponding suppression factor for each frequency band is derived. The NLP (104) also applies the aforementioned suppression factor to one of the capture signals in order to substantially cancel the echo of the capture signal.

Description

technical field [0001] The present invention relates generally to methods and systems for echo cancellation in telecommunication systems, and more particularly to a method and system for canceling residual echoes of an error signal by non-linear post-processing of the error signal. Background technique [0002] Voice quality is an important concern for phone system providers. As customer demands for voice quality continue to increase, it is critical that phone system providers continue to improve. Echo is a delayed manifestation of the original transmission, and if the delay is long, it can seriously disrupt the speaker. If the short-range round-trip delay is less than 20 milliseconds, the talker cannot distinguish echoes and sidetones in the handset of the telephone. However, for long-range communications (such as satellite communications), the remotely generated echo signal often exhibits a significant delay. In addition, the speech and channel coding necessary in digit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04M9/08
CPCH04M9/082
Inventor A·J·麦克唐纳德J·斯科格伦德
Owner GOOGLE LLC
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