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Active Noise Control via Adaptive Noise Filtering

A technology of adaptive filtering and adaptive step size, which is applied in active noise control, sound-generating equipment, speech analysis, etc., and can solve the problems related to overall processor load and speed of ANC stability

Active Publication Date: 2021-12-07
HARMAN BECKER AUTOMOTIVE SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, despite the engineering advances in recent years, there are still issues related to the stability of ANC and overall processor load and speed

Method used

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  • Active Noise Control via Adaptive Noise Filtering
  • Active Noise Control via Adaptive Noise Filtering
  • Active Noise Control via Adaptive Noise Filtering

Examples

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Embodiment Construction

[0057] While the present disclosure is described with reference to the following detailed description and examples illustrated in the accompanying drawings, it should be understood that the following detailed description and accompanying drawings are not intended to limit subject matter to the particular illustrative embodiments disclosed, but rather the illustrations described The preferred embodiments are merely illustrative of the various aspects, and the scope of the disclosure is defined by the appended claims.

[0058] The present invention relates to active noise cancellation in particular in automotive applications. For example, methods and processing apparatus suitable for reducing noise in a vehicle cabin, where the noise may be road noise, are provided. figure 1 An exemplary multi-channel ANC system 10 is shown in which the noise reduction process according to the present invention can be implemented. The multi-channel ANC system 10 may be particularly suitable for...

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Abstract

The present invention relates to a noise reduction method comprising the steps of: filtering a reference signal representing noise by an adaptive filtering device including adaptive filter coefficients to obtain an actuator driving signal; outputting the actuating signal by a loudspeaker the speaker drive signal to obtain a speaker signal; the speaker signal is detected by a microphone; the reference signal is filtered by an estimated transfer function representing the transfer of the speaker signal output by the speaker to the microphone to obtain a filtered a reference signal; and updating the filter coefficients of the adaptive filtering means based on the filtered reference signal and previously updated filter coefficients of the adaptive filtering means multiplied by a leakage factor.

Description

technical field [0001] The present invention relates to techniques for reducing noise in a listener's environment. In particular, the present invention relates to noise reduction through adaptive filtering, eg, in the passenger compartment of a vehicle. Background technique [0002] Two-way voice communications in which two parties send and receive audio signals (particularly voice signals) to each other often suffer from degradation of the audio signal quality caused by background noise. Background noise in noisy environments can seriously affect the quality and intelligibility of speech dialogue, and can (in the worst case) lead to a complete disruption of communications. [0003] A prominent example is hands-free voice communication in vehicles. Hands-free telephones provide a comfortable and safe communication system especially for use in motor vehicles. In the case of a speakerphone, it is necessary to suppress noise in order to ensure communication. The amplitude a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L21/0208G10L21/0232
CPCG10L21/0208G10L21/0232G10K2210/12G10K11/17883G10K11/17853G10K2210/1282G10K11/17854G10K11/17857G10K11/17855G10K11/17817G10K2210/3025G10K2210/3028G10K2210/3055
Inventor M.E.克里斯托夫J.H.佐尔纳
Owner HARMAN BECKER AUTOMOTIVE SYST