A Frequency-Domain Active Noise Control System Based on Coefficient Smoothing
An active noise control and coefficient technology, which is applied in the direction of sound-emitting devices and instruments, can solve problems such as differences in processing results, signal discontinuity, abnormal noise, etc., to improve stability and effectiveness, broad application prospects, and suppress system noise Effect
Active Publication Date: 2021-10-29
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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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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[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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The invention discloses a frequency-domain active noise control system based on coefficient smoothing, which includes a back-end control filter, a coefficient smoother, and a front-end control filter connected in sequence. The time-domain coefficients smooth the time-domain coefficients of the front-end control filter and update the front-end control filter to limit the system noise caused by excessive coefficient changes, thereby improving the stability and effectiveness of the active noise control system. The invention solves the problem of noise occurring in an active noise control system using a frequency domain algorithm.
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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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