Voice Input Device, Method of Producing the Same, and Information Processing System
First Claim
1. A voice input device comprising:
- a first microphone that includes a first diaphragm;
a second microphone that includes a second diaphragm; and
a differential signal generation section that generates a differential signal that indicates a difference between a first voltage signal obtained by the first microphone and a second voltage signal obtained by the second microphone based on the first voltage signal and the second voltage signal,the first diaphragm and the second diaphragm being disposed so that a noise intensity ratio that indicates a ratio of intensity of a noise component contained in the differential signal to intensity of the noise component contained in the first voltage signal or the second voltage signal, is smaller than an input voice intensity ratio that indicates a ratio of intensity of an input voice component contained in the differential signal to intensity of the input voice component contained in the first voltage signal or the second voltage signal; and
the differential signal generation section including;
a delay section that delays at least one of the first voltage signal obtained by the first microphone and the second voltage signal obtained by the second microphone by a predetermined delay amount, and outputs the resulting signal; and
a differential signal output section that receives the first voltage signal obtained by the first microphone and the second voltage signal obtained by the second microphone, at least one of the first voltage signal and the second voltage signal having been delayed by the delay section, generates a differential signal that indicates a difference between the first voltage signal and the second voltage signal, and outputs the differential signal.
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Accused Products
Abstract
A voice input device includes a first microphone (710-1) that includes a first diaphragm, a second microphone (710-2) that includes a second diaphragm, and a differential signal generation section (720) that generates a differential signal that indicates a difference between a first voltage signal and a second voltage signal, the first diaphragm and the second diaphragm being disposed so that a noise intensity ratio is smaller than an input voice intensity ratio (input voice component intensity ratio), and the differential signal generation section (720) including a delay section (730), and a differential signal output section (740) that generates and outputs a differential signal based on a signal delayed by the delay section.
24 Citations
35 Claims
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1. A voice input device comprising:
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a first microphone that includes a first diaphragm; a second microphone that includes a second diaphragm; and a differential signal generation section that generates a differential signal that indicates a difference between a first voltage signal obtained by the first microphone and a second voltage signal obtained by the second microphone based on the first voltage signal and the second voltage signal, the first diaphragm and the second diaphragm being disposed so that a noise intensity ratio that indicates a ratio of intensity of a noise component contained in the differential signal to intensity of the noise component contained in the first voltage signal or the second voltage signal, is smaller than an input voice intensity ratio that indicates a ratio of intensity of an input voice component contained in the differential signal to intensity of the input voice component contained in the first voltage signal or the second voltage signal; and the differential signal generation section including; a delay section that delays at least one of the first voltage signal obtained by the first microphone and the second voltage signal obtained by the second microphone by a predetermined delay amount, and outputs the resulting signal; and a differential signal output section that receives the first voltage signal obtained by the first microphone and the second voltage signal obtained by the second microphone, at least one of the first voltage signal and the second voltage signal having been delayed by the delay section, generates a differential signal that indicates a difference between the first voltage signal and the second voltage signal, and outputs the differential signal. - View Dependent Claims (2, 3, 4, 5, 8, 9, 10, 11, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 28, 29, 30, 31, 32, 33)
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6. A voice input device comprising:
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a first microphone that includes a first diaphragm; a second microphone that includes a second diaphragm; a differential signal generation section that generates a differential signal that indicates a difference between a first voltage signal obtained by the first microphone and a second voltage signal obtained by the second microphone based on the first voltage signal and the second voltage signal; a delay section that delays at least one of the first voltage signal obtained by the first microphone and the second voltage signal obtained by the second microphone by a predetermined delay amount, and outputs the resulting signal; a differential signal output section that receives the first voltage signal obtained by the first microphone and the second voltage signal obtained by the second microphone, at least one of the first voltage signal and the second voltage signal having been delayed by the delay section, and generates a differential signal that indicates a difference between the first voltage signal and the second voltage signal; and a sound source section that is provided at an equal distance from the first microphone and the second microphone, the differential signal generation section changing the delay amount of the delay section based on sound output from the sound source section. - View Dependent Claims (7)
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12. A voice input device comprising:
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a first microphone that includes a first diaphragm; a second microphone that includes a second diaphragm; a differential signal generation section that generates a differential signal that indicates a difference between a first voltage signal obtained by the first microphone and a second voltage signal obtained by the second microphone based on the first voltage signal and the second voltage signal; a noise detection delay section that delays the second voltage signal obtained by the second microphone by a noise detection delay amount; a noise detection differential signal generation section that generates a noise detection differential signal that indicates a difference between the second voltage signal that has been delayed by the noise detection delay section by a predetermined noise detection delay amount and the first voltage signal obtained by the first microphone; a noise detection section that determines a noise level based on the noise detection differential signal, and outputs a noise detection signal based on the determination result; and a signal switching section that receives the differential signal output from the differential signal generation section and the first voltage signal obtained by the first microphone, and selectively outputs the first voltage signal or the differential signal based on the noise detection signal.
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26. A voice input device comprising:
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a first microphone that includes a first diaphragm; a second microphone that includes a second diaphragm; and a differential signal generation section that generates a differential signal that indicates a difference between a first voltage signal obtained by the first microphone and a second voltage signal obtained by the second microphone, the first diaphragm and the second diaphragm being disposed so that a noise intensity ratio that indicates a ratio of intensity of a noise component contained in the differential signal to intensity of the noise component contained in the first voltage signal or the second voltage signal is smaller than an input voice intensity ratio that indicates a ratio of intensity of an input voice component contained in the differential signal to intensity of the input voice component contained in the first voltage signal or the second voltage signal; and at least one of the first diaphragm and the second diaphragm being configured to obtain sound waves through a tubular sound-guiding tube that is provided perpendicularly to a surface of the at least one of the first diaphragm and the second diaphragm. - View Dependent Claims (27)
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34. A method of producing a voice input device that has a function of removing a noise component and includes a first microphone that includes a first diaphragm, a second microphone that includes a second diaphragm, and a differential signal generation section that generates a differential signal that indicates a difference between a first voltage signal obtained by the first microphone and a second voltage signal obtained by the second microphone, the method comprising:
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providing data that indicates a relationship between a ratio Δ
r/λ and
a noise intensity ratio, the ratio Δ
r/λ
indicating a ratio of a center-to-center distance Δ
r between the first diaphragm and the second diaphragm to a wavelength λ
of noise, and the noise intensity ratio indicating a ratio of intensity of the noise component contained in the differential signal to intensity of the noise component contained in the first voltage signal or the second voltage signal;setting the ratio Δ
r/λ
based on the data;setting the center-to-center distance based on the ratio Δ
r/λ
that has been set based on the data and the wavelength of the noise; andcutting some of a plurality of resistors or conductors that form a resistor array included in a delay control section so that a predetermined current is supplied to a predetermined terminal of a delay section that is configured so that a delay amount is changed corresponding to the current that flows through the predetermined terminal, the delay control section supplying the current that controls the delay amount of the delay section to the predetermined terminal of the delay section, and the plurality of resistors being connected in series or parallel in the resistor array. - View Dependent Claims (35)
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Specification