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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: 2014-07-16
SHENZHEN COOLHEAR INFORMATION TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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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. This algorithm divides the entire control filter into two blocks according to the delay characteristics of noise propagation, and one block completes filtering in the time domain to ensure no delay. , the other block uses frequency domain filtering, but the filter updates of the two blocks of data are completed in the frequency domain. This not only ensures the algorithm's zero-delay control of the noise signal that arrives first, but also uses the multi-delay frequency domain algorithm to reduce the overall The calculation amount of the system is reduced, thereby overall improving the applicability and performance of the multi-delay frequency domain algorithm. The significant advantage of the present invention is that it breaks through the time delay limit of the multi-delay frequency domain adaptive algorithm, making it applicable to situations 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 Patents(China)
IPC IPC(8): G10K11/178
Inventor 邱小军陈东
Owner SHENZHEN COOLHEAR INFORMATION TECH CO LTD
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