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Acoustic echo cancellation system and method

An echo and acoustic technology, applied in the direction of microphone signal combination, transducer acoustic response prevention, instruments, etc., can solve problems such as nonlinear distortion and shell vibration

Active Publication Date: 2022-05-24
HARMAN INT IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Vibration of the enclosure due to mechanical coupling between the speaker and the enclosure, especially at lower speech frequencies, can also cause significant nonlinear distortion picked up by the microphone

Method used

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  • Acoustic echo cancellation system and method
  • Acoustic echo cancellation system and method
  • Acoustic echo cancellation system and method

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Embodiment Construction

[0047] The present disclosure is provided in the context of acoustic echo in a speaker-microphone system that also implements an echo canceller.

[0048] As indicated, echo cancellation systems are generally not well suited for removing non-linear distortion caused by speaker transducers, especially in compact hands-free talking devices for cell phones and other mobile devices. Many of the problems associated with hands-free calling devices are blamed on cheap, small speakers. When such a speaker is overloaded, the saturation effect associated with the speaker and its amplifier distorts the sound in a non-linear fashion. The acoustic echo of this sound contains a mixture of linear signals with nonlinear harmonic and intermodulation products. Typical acoustic echo cancellers only estimate the linear acoustic impulse response of the speaker enclosure room environment and the microphone system. The remaining non-linear components in the system can be large and audible, especial...

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Abstract

An audio system includes a speaker, a first microphone, an echo canceller, and a second microphone coupled to the speaker within a speaker housing. The first microphone provides an ambient acoustic signal to the echo canceller. The second microphone may be a high acoustic overload microphone and be placed in the rear chamber of the speaker housing. The loudspeaker is driven using a loudspeaker signal, which may produce non-linear distortions in the acoustic output. The second microphone senses a signal including both linear and nonlinear distortion. This sensed signal is used to remove both linear and non-linear distortions from the ambient acoustic signal picked up from the first microphone and processed by the echo canceller.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of US Provisional Serial No. 61 / 162,210, filed May 15, 2015, the entire disclosure of which is incorporated herein by reference. technical field [0003] Aspects of the present disclosure provide a system and method for correcting distortion (eg, non-linear distortion) from an audio signal transducer in a linear echo cancellation system. Background technique [0004] Acoustic devices are used to project sound and send audio signals to remote devices to allow people to communicate with each other. Echoes and other unwanted signals can interfere with the quality of the acoustic signal being exchanged. [0005] Sound from the speaker can be reflected or coupled back into the microphone after a finite delay, creating an echo. Ideally, the generation of an echo (sound) corresponding to an electrical signal in a device is a linear process. An echo cancellation system is considered a lin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L21/02H04R3/00H04R3/02
CPCH04M9/082H04R3/005H04R3/02G10L21/0232G10L2021/02082H04R1/406H04R3/04
Inventor A.D.米歇尔李胜波B.阿代尔K.尚克
Owner HARMAN INT IND INC