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Frequency domain active noise control system based on coefficient smoothing

A technology of active noise control and coefficient, applied in the direction of sounding equipment, instruments, etc., can solve the problems of difference in processing results, signal discontinuity, abnormal noise, etc., to improve stability and effectiveness, suppress system noise, and have wide application prospects Effect

Active Publication Date: 2021-09-21
南京南大电子智慧型服务机器人研究院有限公司 +2
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Problems solved by technology

Compared with traditional active noise control methods, frequency-domain active noise control has higher operating efficiency, so it is an important implementation method of active noise control systems, but frequency-domain active noise control is based on data The frame is used as a unit to process the signal in real time. When the data frame is relatively large, there is a large difference in the processing results between frames, resulting in signal discontinuity, resulting in abnormal noise, and even affecting the active noise control system. stability, this problem seriously restricts the application and popularization of frequency-domain active noise control

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  • Frequency domain active noise control system based on coefficient smoothing
  • Frequency domain active noise control system based on coefficient smoothing
  • Frequency domain active noise control system based on coefficient smoothing

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[0021] Below in conjunction with accompanying drawing and specific embodiment, further illustrate the present invention, should be understood that these examples are only for illustrating the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various aspects of the present invention All modifications of the valence form fall within the scope defined by the appended claims of the present application.

[0022] A frequency-domain active noise control system based on coefficient smoothing, which is implemented based on a digital signal processor (Digital Signal Processor), the control source is a common loudspeaker, the error signal and reference signal come from the error microphone and reference microphone respectively, and the adaptive The filter uses the traditional frequency-domain least mean squares algorithm (frequency-domain least mean squares, FDLMS). The sam...

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Abstract

The invention discloses a frequency domain active noise control system based on coefficient smoothing, which comprises a rear-end control filter, a coefficient smoother and a front-end control filter which are connected in sequence, and is characterized in that the coefficient smoother is used for smoothing the time domain coefficient of the front-end control filter according to the obtained time domain coefficient of the rear-end control filter; and a front-end control filter is updated to limit system noise caused by overlarge coefficient change, so that the stability and the effectiveness of the active noise control system are improved. According to the invention, the problem of noise occurring in an active noise control system using a frequency domain algorithm is solved.

Description

technical field [0001] The invention relates to a frequency-domain active noise control system with smooth coefficients, belonging to the technical field of noise control. Background technique [0002] In recent years, with the continuous improvement of people's requirements for the surrounding acoustic environment, active noise control has been paid more and more attention. Active noise control is a technology that uses reverse sound waves to cancel actual noise. Compared with traditional passive noise control, active noise control is more effective for low-frequency noise that is difficult to control. In addition to its small size and flexible configuration, it has a wider application prospect. Compared with traditional active noise control methods, frequency-domain active noise control has higher operating efficiency, so it is an important implementation method of active noise control systems, but frequency-domain active noise control is based on data The frame is used ...

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Application Information

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IPC IPC(8): G10K11/178
CPCG10K11/17813G10K11/17853G10K11/17854
Inventor 陈锴刘晓峻狄敏姚志强陆章其
Owner 南京南大电子智慧型服务机器人研究院有限公司
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