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Active noise reduction device and active noise reduction method

A technology of noise reduction and signal processing device, which is applied to hearing devices, transportation and packaging, active noise control and other directions of active noise cancellation, which can solve the problem of smaller update amount and achieve the effect of reducing noise.

Active Publication Date: 2015-03-25
PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0021] However, if the step size parameter μ is set small, the update amount of the filter coefficient W(i) per step becomes small, and it takes time to sufficiently reduce the noise N0

Method used

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  • Active noise reduction device and active noise reduction method
  • Active noise reduction device and active noise reduction method
  • Active noise reduction device and active noise reduction method

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0057] figure 1 It is a block diagram of the active noise reduction device 101 in Embodiment 1 of the present invention. figure 2 It is a schematic diagram of the mobile body 102 equipped with the active noise reduction device 101 . The mobile body 102 in Embodiment 1 is a vehicle having a space S1 such as a vehicle interior. The active noise reduction device 101 is composed of a reference signal source 1 , a secondary noise source 2 , an error signal source 3 , and a signal processing device 4 . The signal processing means 4 outputs a secondary noise signal y(i) based on the reference signal x(i) and the error signal e(i). The noise N0 is reduced by causing the secondary noise N1 generated by reproducing the secondary noise signal y(i) by the secondary noise source 2 to interfere with the noise N0 generated in the space S1.

[0058] The reference signal source 1 is a transducer (transducer) that outputs a reference signal x(i) related to the presence of noise N0 , and is...

Embodiment approach 2

[0163] Figure 9 It is a block diagram of the active noise reduction device 201 in Embodiment 2 of this invention. Figure 10 is a schematic diagram of a mobile body 202 equipped with an active noise reduction device 201 . exist Figure 9 and Figure 10 in, right with figure 1 and figure 2 The same parts of the active noise reduction device 101 and the moving body 102 in the illustrated first embodiment are denoted by the same reference numerals.

[0164] The active noise reduction device 101 in Embodiment 1 includes one reference signal source 1 , one secondary noise source 2 , one error signal source 3 , and a signal processing device 4 . The active noise reduction device 201 can pass through the signal processing device 204, at least one reference signal source 1 ξ , at least one secondary noise source2 η , and at least one error signal source 3 ζ To reduce the noise of space S1.

[0165] The active noise reduction device 201 in Embodiment 2 is equipped with four...

Embodiment approach 3

[0349] Figure 12 It is a block diagram of the active noise reduction device 301 in Embodiment 3 of the present invention. Figure 13 is a schematic diagram of a mobile body 302 equipped with an active noise reduction device 301 . exist Figure 12 and Figure 13 in, right with figure 1 and figure 2 The same parts of the active noise reduction device 101 and the moving body 102 in the illustrated first embodiment are denoted by the same reference numerals. The mobile body 302 in Embodiment 3 is a vehicle having a space S1 such as a vehicle interior. The active noise reduction device 301 is composed of a secondary noise source 2 , an error signal source 3 , and a signal processing device 304 . The signal processing device 304 outputs a secondary noise signal y(i) according to the error signal e(i). The noise N0 is reduced by causing the secondary noise N1 generated by regenerating the secondary noise signal y(i) by the secondary noise source 2 to interfere with the nois...

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Abstract

An active noise reduction device is used together with a secondary noise source which emits a secondary noise, and an error signal source which outputs an error signal which corresponds to a residual sound arising from interference between the secondary noise and a noise. A Mu adjustment unit computes a step-size parameter which updates a filter coefficient of an adaptive filter unit, by multiplying a ratio of a reference representative input value corresponding to a signal amplitude to a representative input value corresponding to this signal amplitude by a reference step-size parameter.

Description

technical field [0001] The present invention relates to an active noise reduction device and an active noise reduction method for reducing noise by interfering canceling sound and noise. Background technique [0002] In recent years, active noise reduction devices that reduce the noise heard by the driver and occupants by canceling the noise generated during the running of vehicles such as automobiles in the interior of the vehicle have been put into practical use. Figure 19 It is a block diagram of a conventional active noise reduction device 901 that reduces noise N0 that can be heard in a space S1 such as a cabin of a vehicle. The active noise reduction device 901 includes a reference signal source 1 , a secondary noise source 2 , an error signal source 3 , and a signal processing device 904 . [0003] The reference signal source 1 is a sensor that detects vibrations such as an acceleration sensor installed on the chassis of the vehicle and a microphone installed in the ...

Claims

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Application Information

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IPC IPC(8): G10K11/178B60R11/02H03H21/00
CPCG10K2210/1282G10K2210/3055H04R3/00H04R2460/01H04R2499/13G10K2210/3054G10K11/17821G10K11/17881G10K11/17854G10K11/17817G10K11/17883G10K11/17823G10K11/17855G10K11/17825H04R3/02
Inventor 谷充博舟山敏之开藤充
Owner PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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