Noise extraction device using microphone

A microphone and noise technology, applied in the direction of frequency/direction characteristic device, microphone signal combination, transducer circuit, etc., to achieve the effect of good vibration resistance

Active Publication Date: 2009-10-28
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] Furthermore, in the above-mentioned conventional structure, it is necessary to separately provide a vibration sensor (here, the microphone unit 2) for canceling the vibration component from the microphone unit 1 of the sound wave of the sound collection purpose, which becomes a constraint on installation.

Method used

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Experimental program
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Embodiment approach 1

[0077] figure 1 It is a block diagram showing the structure of a noise extraction device using a microphone according to Embodiment 1 of the present invention. In addition, in the following description, the signal in the time zone will be described with the first character of the signal name being a small character, and the signal in the frequency zone will be described with the first character of the signal name being a large character. Note that xm0(n) is denoted as xm0, and Xm0(ω) is denoted as Xm0 for description.

[0078] figure 1 The noise extraction device 100 shown includes a first microphone unit 11 and a second microphone unit 12, and includes a first directivity combining unit 20, a second directivity combining unit 30, a third directivity combining unit 40, and a first signal absolute value. The calculation unit 71, the second signal absolute value calculation unit 72, the third signal absolute value calculation unit 73, and the signal cancellation calculation unit...

Embodiment approach 2

[0155] Hereinafter, Embodiment 2 of the present invention will be described.

[0156] Figure 4 It is a block diagram showing the structure of a noise extraction device using a microphone according to Embodiment 2 of the present invention. For and figure 1 The same elements are given the same reference numerals, and detailed descriptions are omitted.

[0157] Figure 4 The noise extraction device 200 shown includes a first microphone unit 11 and a second microphone unit 12, and includes a first directivity combining unit 20, a second directivity combining unit 30, a third directivity combining unit 40, and a first signal band limiter. Section 61, the second signal band limitation section 62, the third signal band limitation section 63, the first signal absolute value calculation section 71, the second signal absolute value calculation section 72, the third signal absolute value calculation section 73, and the signal cancellation calculation section 80.

[0158] In addition, the...

Embodiment approach 3

[0173] Hereinafter, Embodiment 3 of the present invention will be described.

[0174] Figure 5 It is a block diagram showing the structure of a noise extraction device using a microphone according to Embodiment 3 of the present invention. For and figure 1 and Figure 4 The same parts are assigned the same reference numerals, and detailed descriptions are omitted.

[0175] Figure 5 The noise extraction device 300 shown differs from the noise extraction device 100 of the second embodiment in that the signal restoration unit 90 is provided.

[0176] The signal restoration unit 90 includes a signal sign extraction unit 91 and a signal multiplication unit 92. The signal restoration unit 90 receives the output signal nv1 representing the vibration and noise amplitude information output from the signal cancellation calculation unit 80 and the output signal xm2 from the third directivity combining unit 40, and outputs the output signal nv2.

[0177] Specifically, the signal sign extra...

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Abstract

A noise extraction device includes: a first and a second microphone unit (11, 12) for collecting a sound; a directivity synthesis unit which directivity-synthesizes output signals from the first and the second microphone unit (11, 12) to generate two directivity synthesis signals having different noise sensitivities but identical directivity characteristic for a sound pressure and an identical acoustic center position; and an acoustic cancelling unit which subtracts one of the directivity synthesis signals from the other and cancels an acoustic component in one of the directivity synthesis signals so as to extract a noise component.

Description

Technical field [0001] The present invention relates to a noise extraction device, and more particularly, to a noise extraction device using a microphone that extracts vibration noise from a microphone device that is output by performing signal processing on signals from two or more microphone units. Background technique [0002] There is a microphone device that performs signal processing on signals from two or more microphone units to obtain an output. As the signal processing in the microphone device, for example, there is a sound pressure gradient type directivity synthesis method. The directivity synthesis method has the advantages of being compact and capable of forming directivity. On the other hand, it has the disadvantage that the sound pressure sensitivity is decreased during directivity synthesis. That is, in the directivity synthesis method, although directivity can be formed, the sensitivity to sound pressure is lower than the noise level of vibration noise generated...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R3/00H04R1/40
CPCH04R3/005
Inventor 金森丈郎
Owner PANASONIC CORP
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