JPS64895A - Directional microphone - Google Patents
Directional microphoneInfo
- Publication number
- JPS64895A JPS64895A JP15589687A JP15589687A JPS64895A JP S64895 A JPS64895 A JP S64895A JP 15589687 A JP15589687 A JP 15589687A JP 15589687 A JP15589687 A JP 15589687A JP S64895 A JPS64895 A JP S64895A
- Authority
- JP
- Japan
- Prior art keywords
- microphone
- directivity
- output
- phase
- phase shifter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Circuit For Audible Band Transducer (AREA)
Abstract
PURPOSE:To obtain a microphone which is miniaturized and has sharp in directivity and in addition, has a good directivity characteristic even at a high frequency by making a phase shifter into a multistage. CONSTITUTION:A sound wave coming from an angle theta against the main axis direction of the directivity of a microphone element, is made incident on the microphone elements 1a and 1b while keeping a prescribed phase difference. The output of the element 1b, after its phase is delayed by the set 2 of the multistaged phase shifter, is subtracted from the output of the element 1a by a synthesizer 3, and afterward, is outputted through an equalizer 4.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62-155896A JPH01895A (en) | 1987-06-23 | directional microphone |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62-155896A JPH01895A (en) | 1987-06-23 | directional microphone |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS64895A true JPS64895A (en) | 1989-01-05 |
JPH01895A JPH01895A (en) | 1989-01-05 |
Family
ID=
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0470200A (en) * | 1990-07-10 | 1992-03-05 | Hitachi Plant Eng & Constr Co Ltd | Electronic silencing system |
US5506908A (en) * | 1994-06-30 | 1996-04-09 | At&T Corp. | Directional microphone system |
JP2002253543A (en) * | 2001-03-01 | 2002-09-10 | Hitachi Medical Corp | X-ray ct device |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0470200A (en) * | 1990-07-10 | 1992-03-05 | Hitachi Plant Eng & Constr Co Ltd | Electronic silencing system |
US5506908A (en) * | 1994-06-30 | 1996-04-09 | At&T Corp. | Directional microphone system |
JP2002253543A (en) * | 2001-03-01 | 2002-09-10 | Hitachi Medical Corp | X-ray ct device |
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