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Method for improving performance of feedforward narrow-band active noise control system

A technology for active noise control and system performance, which is applied in the direction of sound-emitting devices, speech analysis, instruments, etc., and can solve the problems that the system cannot effectively suppress the target noise, the true frequency deviation of the target noise, and the decrease in sensor measurement accuracy

Inactive Publication Date: 2011-02-16
HARBIN INST OF TECH
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Problems solved by technology

[0004] In practical applications, due to long-time work, the measurement accuracy of the sensor is reduced due to aging and other reasons, resulting in a large deviation between the obtained reference signal frequency and the real frequency of the target noise. At this time, the system cannot effectively suppress the target noise.

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  • Method for improving performance of feedforward narrow-band active noise control system
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  • Method for improving performance of feedforward narrow-band active noise control system

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specific Embodiment approach 1

[0027] Specific implementation mode one: combine Figure 1 to Figure 4 Describe this embodiment. The feedforward narrowband active noise control system in this embodiment includes a frequency compensation subsystem 1, a signal synthesis subsystem 2, and a secondary channel online identification subsystem 3;

[0028] The frequency compensation subsystem 1 includes a second-order autoregressive module 11 and a least mean square algorithm module 12,

[0029] Among them, the second-order autoregressive module 11 combines the characteristics of the narrowband active noise control system through the bivalent autoregressive model in the general sense ( figure 2 Shown) is obtained by expanding. Depend on figure 2 It can be seen that the output signal x(n) of the bivalent autoregressive model is calculated according to the following formula:

[0030] x(n)=-c(n)x(n-1)-x(n-2)

[0031] Among them, the model coefficient c(n) is usually updated in real time by the gradient algorithm. ...

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Abstract

The invention discloses a method for improving the performance of a feedforward narrow-band active noise control system, which relates to the field of active noise control, and aims at the situation that the reference signal frequency acquired by a non-acoustic sensor in the feedforward narrow-band active noise control system with a minor access road on-line identification function and the target noise actual frequency are imbalanced and the problem the auxiliary noise brought by the minor access road on-line identification seriously hinders the reduction of the residual noise energy of the system. The control system comprises a frequency compensation subsystem, a signal synthesis subsystem and a minor access road on-line identification subsystem; the frequency compensation subsystem comprises a second-order autoregression module and a least mean square (LMS) algorithm module; the frequency compensation subsystem transmits the cosine component and sinusoidal component of the adjusted reference signal of an ith frequency channel to the signal synthesis; when the frequency imbalance reaches above 50%, the target noise can still be effectively restrained; and when in a steady state, the residual noise energy of the system is reduced to an ideal level, so that the performance of the control system can be further improved and is closer to the practice.

Description

technical field [0001] The invention relates to the field of active noise control (ANC), in particular to the compensation of the misalignment between the frequency of the reference signal obtained by the non-acoustic sensor and the real frequency of the target noise in the narrow-band active noise control system and the improvement of the auxiliary noise by constraining the auxiliary noise in the online identification subsystem of the secondary channel. A method for narrowband active noise control system performance. Background technique [0002] Compared with traditional passive noise control methods, active noise control (ANC) technology has the advantages of good low-frequency performance, large room for controller improvement, and low cost. It is suitable for controlling low-frequency harmonic noise and audio noise in a wide frequency range. An indispensable and beneficial complement to traditional passive methods. [0003] A narrow-band active noise control system use...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/02G10K11/178
Inventor 孙金玮刘剑肖业贵魏国
Owner HARBIN INST OF TECH
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