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Acoustic echo cancellation reference signal

An acoustic echo cancellation and reference signal technology, which can be used in microphone signal combination, telephone communication, two-way sound reinforcement telephone system, etc., and can solve the problem of large acoustic echo and so on.

Active Publication Date: 2018-11-09
KNOWLES ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Use of small speakers can lead to larger than usual non-linear components in the acoustic echo

Method used

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  • Acoustic echo cancellation reference signal
  • Acoustic echo cancellation reference signal
  • Acoustic echo cancellation reference signal

Examples

Experimental program
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Embodiment Construction

[0013] The techniques disclosed herein relate to systems and methods for acoustic echo cancellation.

[0014] figure 1 is a block diagram illustrating an example system 100 for communication between audio devices. figure 1 An audio device 110 , an audio device 140 and an audio communication network 120 are included. The audio communication network 120 may transmit audio signals between the audio device 110 and the audio device 140 during a telephone conversation.

[0015] figure 2 is a block diagram of the audio device 110 and the audio device 140 according to an example embodiment. Audio device 110 may include a radio receiver 210 , a processor 220 , one or more microphones 230 , an audio processing system 240 and an output device 250 .

[0016] The radio receiver of the audio device 110 may be configured to receive audio signals from the audio communication network 120 . The audio signal may be forwarded to an audio processing system 240 for processing the audio signal...

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Abstract

Systems and methods for acoustic echo cancellation are provided. An example method includes receiving a reference signal. The reference signal represents at least one sound captured inside an enclosure of a loudspeaker. The loudspeaker is operable to play back a far end signal. The method also includes receiving an acoustic signal. The acoustic signal represents at least one sound captured outsidethe enclosure of the loudspeaker. The acoustic signal includes at least a near end signal and the far end signal. The method enables attenuation, using the reference signal, the far end signal in theacoustic signal. The reference signal can be captured by a low sensitivity microphone placed inside the enclosure of the loudspeaker. The attenuation of the far end signal may include subtractive cancellation.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Provisional Application No. 62 / 278,872, filed January 14, 2016, the contents of which are hereby incorporated by reference in their entirety. Background technique [0003] Acoustic echoes may occur during conversations over a communication network. The far-end signal entering the communication device can be played back through the speaker of the communication device. The microphone of the communication device can capture both the near-end signal and the output of the speaker. The mix of the near-end signal and the speaker's output can be transmitted back to the far-end so that the listener at the far-end receives a delayed version of his own speech as an "echo" sound. [0004] Conventional AEC techniques work well for canceling the linear echo from the uplink signal, while the nonlinear component of the echo is not suppressed. The use of small loudspeakers has the potential to re...

Claims

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Application Information

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IPC IPC(8): H04M9/08
CPCH04M9/082H04R1/2826H04R1/2834H04R3/005H04R3/02H04R3/04H04R29/001H04R2499/11
Inventor P·沙A·D·昂鲁
Owner KNOWLES ELECTRONICS INC