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Systems and methods for feedback detection

A technology of feedback detection and feedback loop, applied in the direction of transducer acoustic response prevention, active noise cancellation hearing devices, instruments, etc.

Inactive Publication Date: 2019-02-15
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, for electronic devices that utilize audio signals, particular challenges can arise

Method used

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  • Systems and methods for feedback detection
  • Systems and methods for feedback detection
  • Systems and methods for feedback detection

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Embodiment Construction

[0028] Some configurations of the systems and methods disclosed herein utilize a second (eg, error) microphone signal to implement acoustic feedback detection. Acoustic feedback is a problem that can arise when a transducer (eg, a microphone) is coupled to a speaker via an electronic signal path. Examples of systems with this setup include hearing aids, public address systems, voice amplifiers, and active noise cancellation (ANC) systems.

[0029] In active noise cancellation applications (such as in headphones and handsets), a noisy microphone that picks up ambient noise is coupled to a speaker via an electronic signal path that processes the signal so that the signal produced by the speaker cancels the incoming ambient noise put one's oar in. This setting may produce acoustic feedback if the sound produced by the speaker leaks back into the noisy microphone. This acoustic feedback is an unwanted artifact of the ANC system. Therefore, it would be beneficial to prevent this...

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Abstract

The present invention describes a method for feedback detection by an electronic device. The method includes receiving, by a first microphone, a first microphone signal. A feedback loop includes the first microphone and speaker. The method also includes receiving a second microphone signal through a second microphone outside the feedback loop. A first signal based on the first microphone signal and a second signal based on the second microphone signal exhibit a higher degree of correlation in the presence of feedback and a lower degree of correlation in the absence of feedback. The method further includes determining a correlation based on the first microphone signal and the second microphone signal. The method additionally includes determining whether feedback occurs based on the correlation.

Description

[0001] Related applications [0002] This application is related to and claims priority to US Provisional Patent Application No. 61 / 916,373, filed December 16, 2013, for "System and Method for Feedback Detection." technical field [0003] The present invention generally relates to electronic devices. More specifically, the present invention relates to systems and methods for feedback detection. Background technique [0004] In recent decades, the use of electronic devices has become widespread. Specifically, advances in electronics technology have reduced the cost of increasingly complex and useful electronic devices. Reduced costs and consumer demand have dramatically increased the use of electronic devices, making them ubiquitous in modern society. As the use of electronic devices has spread, there has been a need for new and improved features of electronic devices. More specifically, electronic devices that perform new functions and / or perform functions faster, more ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R3/02G10K11/178H04R25/00
CPCH04R3/02H04R25/453H04R2460/01G10K2210/3027G10K2210/3026G10K2210/3056G10K11/17833G10K11/17819G10K11/17823G10K11/17825G10K11/17853G10K11/17881
Inventor 朴勋真迪帕克·库玛·沙拉
Owner QUALCOMM INC