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Noise control device

A noise control and control device technology, applied in active noise control, sound-generating devices, instruments, etc., can solve the problems of difficult noise and noise buffer wave phase consistency, huge structure, unusable, etc., to achieve the effect of reducing noise

Inactive Publication Date: 2008-09-03
NISSAN MOTOR CO LTD
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, in the high-frequency range, especially for high-frequency components above 1 kHz, the time required for outputting the noise buffer wave after the noise is detected is relatively long relative to the time of one cycle of the noise frequency, so it is difficult to The phase of the noise and the noise buffer wave are aligned, so there is a problem that the noise cannot be effectively reduced
[0009] In addition, in the variable resonator structure, in order to eliminate the low frequency band, especially the frequency less than 1kHz, the structure is bulky, and there is a problem that it cannot be used in the limited installation space in the interior of a motor vehicle, which requires space saving.

Method used

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no. 1 approach

[0029] figure 1 and figure 2 It is a figure for demonstrating the noise control apparatus of 1st Embodiment of this invention. figure 1 is a block diagram showing a schematic configuration of the noise control device of the present embodiment, figure 2 express figure 1 The flowchart of the operation of the noise control device shown is equivalent to the working steps of the noise control device of the present embodiment.

[0030] Such as figure 1 As shown, the noise control device 10 of this embodiment includes a noise detection device (noise detection sensor) 11 , a stimulus source control device 12 , a stimulus source supply device 13 , and a variable sound absorption rate member 14 .

[0031] First, in order to facilitate the understanding of the noise control device 10 of the present invention, the variable sound absorption member 14 which is one of the characteristic elements of the present invention will be described.

[0032] The variable sound absorption rate co...

no. 2 approach

[0065] Figure 5 and Figure 6 It is a figure for demonstrating the noise control apparatus of 2nd Embodiment of this invention. Figure 5 is a block diagram showing a schematic configuration of a noise control device according to a second embodiment, Figure 6 means as Figure 5 The work flow of the noise control device shown corresponds to the work steps of the noise control device of this embodiment.

[0066] In the first embodiment and the second embodiment, with figure 1 corresponding Figure 5 Among them, the difference is that a sound pressure level calculation device 12a and a threshold value determination device 12b are provided. other components and figure 1 Since they are completely the same, descriptions of common constituent elements are omitted in order to avoid repeated descriptions. also, Figure 5 Since there is a figure 1 Different constituent elements, and thus the functional differences of the constituent elements only illustrate their different as...

no. 3 approach

[0079] Figure 7 and Figure 8 It is a figure for demonstrating the noise control apparatus of 3rd Embodiment of this invention. Figure 7 is a block diagram showing a schematic configuration of a noise control device according to a third embodiment, Figure 8 express Figure 7 The work flow of the noise control device shown corresponds to the work steps of the noise control device of this embodiment.

[0080] The difference between the second embodiment and the third embodiment is as follows, that is, in the Figure 5 corresponding Figure 7 Among them, two types of noises can be detected by the outdoor noise detection device 11a and the indoor noise detection device 11b as the noise detection device, and a sound pressure level determination device 12c is provided. Due to other components and Figure 5 They are completely the same, so descriptions of common constituent elements are omitted in order to avoid repeated descriptions. In addition, in Figure 7 , since the ...

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Abstract

The invention relates to a noise control device which effectively reduces noise of a broad frequency band, including a noise detecting part (11) for detecting the noise from a noise source, a stimulus source control signal device (12) for outputting the stimulus source control signal corresponding to the noise frequency detected by the noise detecting part (11), a stimulus source feeding device (13) for supplying to the stimulus source applying the stimulus based on the stimulus source control signal output from the stimulus source control signal device (12), and a sound absorptivity variable member (14) for receiving the stimulus source supplied by the stimulus source feeding device (13) and changing the sound absorptivity against the noise responsive to the stimulus source.

Description

technical field [0001] The present invention relates to a noise control device, in particular to a noise control device for reducing noise generated by a noise source to ensure indoor quietness. Background technique [0002] It is important to reduce the noise generated from noise sources such as mechanical structures such as internal combustion engines mounted on vehicles, ensure indoor quietness, consider human health, and provide a comfortable living environment. [0003] As a technique for reducing noise, for example, a technique called active noise control (active noise control) is known. The so-called active noise control is such a technology, that is, based on the fact that the sound is a wave phenomenon that propagates in the air by using the density change of the air, it interferes with the noise by outputting other sound waves with the same amplitude and opposite phase as the noise to reduce the noise. Or eliminate that noise. [0004] As a technique for reducing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/16G10K11/162
CPCG10K11/16F02B77/13G10K11/162G10K2210/1282G10K2210/3223
Inventor 三浦宏明
Owner NISSAN MOTOR CO LTD