Title:
VARIABLE DIRECTIVITY CAPACITOR MICROPHONE
Document Type and Number:
Japanese Patent JP2016171372
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a variable directivity capacitor microphone by using a phase modulation oscillation detection system.SOLUTION: A variable directivity capacitor microphone includes first and second capacitor microphone units Uf, Ub disposed back to back each other, first and second resonance circuits having electrostatic capacitors Cf, Cb of the first and second capacitor microphone units, respectively, an oscillation circuit 11 giving a high frequency bias signal to each resonance circuit, and first and second demodulation circuits 12, 13 for demodulating the voice signals corresponding to the electrostatic capacitance change of the first and second capacitor microphone units, respectively. A signal from the first demodulation circuit is brought to a second terminal pin PIN2, as a hot side output, a signal from the second demodulation circuit and at least a signal of reverse phase thereof are selected by selection means, and is brought to a third terminal pin PIN3, as a cold side output.SELECTED DRAWING: Figure 1
Inventors:
AKINO YUTAKA
Application Number:
JP2015048186A
Publication Date:
September 23, 2016
Filing Date:
March 11, 2015
Export Citation:
Assignee:
AUDIO TECHNICA KK
International Classes:
H04R3/00; H04R1/40; H04R19/04
Domestic Patent References:
| JP2012090023A | 2012-05-10 | |||
| JP2008306637A | 2008-12-18 | |||
| JPS5710598A | 1982-01-20 | |||
| JPS57193198A | 1982-11-27 | |||
| JP2010273195A | 2010-12-02 | |||
| JP2008271466A | 2008-11-06 |
Attorney, Agent or Firm:
Kinoshita Shigeru
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