Integrated circuit device, voice input device and information processing system

• US 9,025,794 B2
• Filed: 11/21/2007
• Issued: 05/05/2015
• Est. Priority Date: 11/22/2006
• Status: Expired due to Fees

• Current Assignee: Funai Electric Co., Ltd. (Funai Electric Holdings Company Limited)
• Original Assignee: Funai Electric Co., Ltd. (Funai Electric Holdings Company Limited)
• Inventors: Takano, Rikuo, Sugiyama, Kiyoshi, Fukuoka, Toshimi, Ono, Masatoshi, Horibe, Ryusuke, Maeda, Shigeo, Tanaka, Fuminori, Inoda, Takeshi, Choji, Hideki
• Primary Examiner(s): Lao, Lun-See
• Application Number:
  US12/516,018
• Publication Number:
  US 20100266146A1
• Time in Patent Office: 2,722 Days
• Field of Search: 381/104, 381/92, 381/91, 381/355, 381/356, 381/369, 381/170, 381/173, 381/174, 381/362, 381/122, 381/120, 381/113, 381/111, 292/94, 296/021
• US Class Current: 381/111
• CPC Class Codes: H04R 1/04 Structural association of microphone with electric circuitry therefor in deaf-aid sets H04R25/00
• CPC Class Codes: H04R 1/406 microphones
• CPC Class Codes: H04R 19/005 using semiconductor materials
• CPC Class Codes: H04R 19/016 for microphones
• CPC Class Codes: H04R 2499/11 Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's
• CPC Class Codes: H04R 31/006 Interconnection of transducer parts of diaphragm and outer suspension by moulding H04R31/003

Abstract

An integrated circuit device includes a circuit board (1200′), the circuit board including a first diaphragm (714-1) that forms a first microphone, a second diaphragm (714-2) that forms a second microphone, and a differential signal generation circuit (720) that receives a first voltage signal obtained by the first microphone and a second voltage signal obtained by the second microphone, and generates a differential signal that indicates a difference between the first voltage signal and the second voltage signal.

Claims

1. An integrated circuit device comprising a circuit board, the circuit board including:

a first diaphragm that forms a first microphone;

a second diaphragm that forms a second microphone; and

a differential signal generation circuit that receives a first voltage signal obtained by the first microphone and a second voltage signal obtained by the second microphone, and generates a differential signal that indicates a difference between the first voltage signal and the second voltage signal;

wherein the differential signal generation circuit includes;

a gain section that amplifies the first voltage signal obtained by the first microphone by a predetermined gain;

a differential signal output section that receives the first voltage signal amplified by the gain section and the second voltage signal obtained by the second microphone, generates a differential signal that indicates a difference between the first voltage signal amplified by the gain section and the second voltage signal, and outputs the differential signal;

an amplitude difference detection section that receives the first voltage signal and the second voltage signal input to the differential signal output section, detects a difference in amplitude between the first voltage signal and the second voltage signal when the differential signal is generated based on the first voltage signal and the second voltage signal that have been received, generates an amplitude difference signal based on the detection result, and outputs the amplitude difference signal; and

a gain control section that changes an amplification factor of the gain section based on the amplitude difference signal,

wherein the first microphone and the second microphone receive an equal sound pressure from a gain adjustment test sound source; and

wherein the gain section change the amplification factor so that the amplitude difference signal is within a predetermined range.

2. A voice input device comprising the integrated circuit device as defined in claim 1.

3. An information processing system comprising:

the integrated circuit device as defined in claim 1; and

an analysis section that analyzes input voice information based on the differential signal.

4. An information processing system comprising:

a voice input device that includes the integrated circuit device as defined in claim 1, and a communication processing device that performs a communication process through a network; and

a host computer that analyzes input voice information input to the voice input device based on the differential signal acquired by a communication process through the network.