JPS5476128A - Ultra directional sound collector - Google Patents
Ultra directional sound collectorInfo
- Publication number
- JPS5476128A JPS5476128A JP14366377A JP14366377A JPS5476128A JP S5476128 A JPS5476128 A JP S5476128A JP 14366377 A JP14366377 A JP 14366377A JP 14366377 A JP14366377 A JP 14366377A JP S5476128 A JPS5476128 A JP S5476128A
- Authority
- JP
- Japan
- Prior art keywords
- microphones
- directivity
- sound collector
- added
- directions
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
- H04R1/40—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers
- H04R1/406—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers microphones
Landscapes
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
Abstract
PURPOSE:To obtain a sound collector having narrow directivity by directing and disposing unidirectional microphones in plural sound source directions, directing respective directional directions to the measuring object and inputting the outputs thereof to an adder via delay circuit and amplifier. CONSTITUTION:The outputs of an adder A are added as much as for the number of microphones with respect to the incident signals from the sound source direction but are randomly added after receiving the effect of the gain differences and phase differences depending upon the distances between the microphones and the attenuation owing to the directivity of the microphones per se with respect to the incident signals from the other directions and therefore even if N pieces of microphones are used, the value becomes not the one added for the N pieces but the value lower than that, thus the directivity may be apparently made narrower than that of the single microphone and this phenomenon becomes more conspicuous as the number of the microphones is increased. Thereby, the sound collector having narrow directivity may be obtained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14366377A JPS5476128A (en) | 1977-11-29 | 1977-11-29 | Ultra directional sound collector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14366377A JPS5476128A (en) | 1977-11-29 | 1977-11-29 | Ultra directional sound collector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5476128A true JPS5476128A (en) | 1979-06-18 |
Family
ID=15344027
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14366377A Pending JPS5476128A (en) | 1977-11-29 | 1977-11-29 | Ultra directional sound collector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5476128A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2438259A (en) * | 2006-05-15 | 2007-11-21 | Roke Manor Research | Audio recording system utilising a logarithmic spiral array |
-
1977
- 1977-11-29 JP JP14366377A patent/JPS5476128A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2438259A (en) * | 2006-05-15 | 2007-11-21 | Roke Manor Research | Audio recording system utilising a logarithmic spiral array |
| GB2438259B (en) * | 2006-05-15 | 2008-04-23 | Roke Manor Research | An audio recording system |
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