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Time-frequency domain hybrid adaptive active noise control algorithm

An active noise control and self-adaptive technology, which is applied in the direction of sound-producing devices and instruments

Active Publication Date: 2012-08-08
SHENZHEN COOLHEAR INFORMATION TECH CO LTD
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Problems solved by technology

The second block is generally many times longer than the first block, and is implemented by frequency domain filtering, allowing a certain delay

Method used

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  • Time-frequency domain hybrid adaptive active noise control algorithm
  • Time-frequency domain hybrid adaptive active noise control algorithm

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Embodiment Construction

[0043] The characteristics of the algorithm proposed by the present invention are: according to the delay characteristics of noise propagation, the entire control filter is divided into two blocks, one completes filtering in the time domain to ensure no delay, and the other uses frequency domain filtering, but the two blocks The filter update of the data is completed in the frequency domain, which not only ensures the zero-delay control of the algorithm for the first-arriving noise signal, but also uses the multi-delay frequency domain algorithm to reduce the calculation amount of the entire system, thereby improving the overall multi-delay Applicability and performance of frequency domain algorithms. The following takes the active control of noise in a certain room as an example to introduce its implementation process.

[0044] Noise somewhere in a room consists of direct sound from the noise source and reverberant sound caused by room walls, etc. In order to better eliminat...

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Abstract

The invention discloses a time-frequency domain hybrid adaptive active noise control algorithm. According to the algorithm, an entire control filter is divided into two blocks according to time delay characteristic of noise propagation; one of the two blocks is used for finishing filtering in time domain to guarantee no time delay, and frequency-domain filtering is adopted by the other one of the two blocks; the updating of both the filters of data of the two blocks is finished in the frequency domain; and thus, the algorithm guarantees that zero time delay control of a noise signal is firstly achieved and the amount of calculation of the entire system is reduced by utilizing a multi-time delay frequency domain algorithm, thereby integrally improving the applicability and the performance of the multi-time delay frequency domain algorithm. The time-frequency domain hybrid adaptive active noise control algorithm has the obvious advantage of breaking through the time delay limit of the multi-time delay frequency domain adaptive algorithm and can be used at places without time delay requirements.

Description

1. Technical field [0001] The invention relates to the field of active noise control, and proposes a time-frequency domain hybrid self-adaptive active noise control algorithm. 2. Background technology [0002] Aiming at the deficiencies of traditional noise control methods, active noise control provides a very effective control method for low-frequency noise, that is, the purpose of noise reduction is achieved by artificially introducing the interaction between the control sound source and the original noise. Since the original noise and the control environment are generally time-varying, it is necessary to adaptively adjust the output waveform of the control sound source to maintain the performance of the noise reduction system. In the current application of active noise control in closed spaces such as engine rooms and cars, one of the main obstacles to the practicality of active noise control systems is the limited bandwidth of noise reduction. This can be improved by us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/178
Inventor 邱小军陈东
Owner SHENZHEN COOLHEAR INFORMATION TECH CO LTD
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