Method and device for elininating echoes

Patent

Method and device for elininating echoes

- 15 Jun 2012

2

TL;DR: In this paper, an echo path characteristic parameter of an echo signal is estimated, and the echo estimation signal is subtracted from a speech signal to be processed, which solves the problem in the related art that self-adaptation cannot be achieved when a returned near end audio is suppressed.

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Citations

Patent

Echo path change detector with robustness to double talk

Amit Singh Chhetri

- 30 May 2013

TL;DR: In this paper, an echo path change detector may be used to control the rate of adaptation in an acoustic echo canceller, but echo path changes should not be declared in the presence of double talk, because rapid adaptation during double talk is undesirable.

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5

Patent

Echo cancellation device

Tomoharu Awano, +3 more

- 14 May 2013

TL;DR: In this paper, the delay controllers control the delay amounts D 2 and D 3 such that a tap length L A satisfies a condition of L A ≧ 2D 1 +D 2 =D 2 +D 3, the tap length indicating a response time of the adaptive filter in the full-band echo canceller.

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2

References

Patent

Control of a loudspeaker output

Temujin Gautama

- 22 Jun 2011

TL;DR: In this paper, a signal processor processes the audio signal to derive a loudspeaker drive signal which results in the loudspeaker membrane reaching its maximum displacement in both directions of diaphragm displacement.

...read moreread less

131

Patent

Acoustic echo devices and methods

Alan V. McCree, +3 more

- 24 Jun 2005

TL;DR: In this article, a comparison of frame power estimate with an adaptive frame noise power estimate, automatic gain control with fast adaptation and minimal speech distortion, echo cancellation updated in the frequency domain with stepsize optimization and smoothed spectral whitening, and echo suppression with adaptive talking-state transitions is made.

...read moreread less

92

Patent

Echo canceller with interference-level controlled step size

Brox Wolfgang

- 20 Jan 2005

TL;DR: In this paper, the authors proposed an echo canceling method comprising the steps: a) receiving a first signal and a second signal, said second signal comprising an echo of the first signal, b) generating an echo replica signal by filtering the first signals with a finite impulse response filter, and c) updating the filter coefficient vector by the step vector.

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Patent

Method for controlling acoustic echo cancellation and audio processing apparatus

Xuejing Sun, +2 more

- 25 Nov 2013

TL;DR: In this article, a method for controlling acoustic echo cancellation and an audio processing apparatus are described, which includes an acoustic echo canceer for suppressing acoustic echo in a microphone signal, a jitter buffer for reducing delay jitter of a received signal, and a joint controller for controlling the acoustic echo canceller by referring to at least one future frame in the Jitter buffer.

...read moreread less

13

Patent

Echo canceller with enhanced infinite and finite ERL detection

Adil Benyassine, +1 more

- 11 Jun 2005

TL;DR: In this article, a method for detecting an infinite echo return loss (ERL) in an echo cancellation system while in a finite ERL mode is presented. But the method is not suitable for the case of the case where the ERL threshold is defined as a function of the ENR.

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