GB497672A - Improvements in or relating to microphones and like devices for converting acoustical vibrations into electric oscillations - Google Patents
Improvements in or relating to microphones and like devices for converting acoustical vibrations into electric oscillationsInfo
- Publication number
- GB497672A GB497672A GB1749737A GB1749737A GB497672A GB 497672 A GB497672 A GB 497672A GB 1749737 A GB1749737 A GB 1749737A GB 1749737 A GB1749737 A GB 1749737A GB 497672 A GB497672 A GB 497672A
- Authority
- GB
- United Kingdom
- Prior art keywords
- chamber
- passages
- microphones
- relating
- devices
- 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.)
- Expired
Links
- 230000010355 oscillation Effects 0.000 title abstract 2
- 238000013016 damping Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/222—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only for microphones
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/08—Microphones
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Abstract
497,672. Acoustic filters. ABRAHAMS, A. I. June 23, 1937, No. 17497. [Class 13] [Also in Group XXXIX] In a microphone or like device for converting acoustical vibrations into electrical oscillations and comprising a diaphragm and inner and outer polepieces, a damping member 37 extend. ing across the gap' between the inner and outer polepieces is formed with two concentric annular recesses, one of which forms a chamber 55 in direct communication with the space at the rear of the diaphragm and the other of which in conjunction with the outer polepiece forms a second chamber 57, said two chambers communicating through small grooves, slots or passages 56 and said second chamber being provided with restricted outlet passages communicating with a space which is closed to the atmosphere and which may be constituted, for example, by the casing 21 of the device. The chambers and passages are shaped and dimensioned to provide an image impedance which is constant for the frequencies to be transmitted.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US148291A US2202886A (en) | 1937-06-15 | 1937-06-15 | Microphone |
| GB1749737A GB497672A (en) | 1937-06-23 | 1937-06-23 | Improvements in or relating to microphones and like devices for converting acoustical vibrations into electric oscillations |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1749737A GB497672A (en) | 1937-06-23 | 1937-06-23 | Improvements in or relating to microphones and like devices for converting acoustical vibrations into electric oscillations |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB497672A true GB497672A (en) | 1938-12-23 |
Family
ID=10096201
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1749737A Expired GB497672A (en) | 1937-06-15 | 1937-06-23 | Improvements in or relating to microphones and like devices for converting acoustical vibrations into electric oscillations |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB497672A (en) |
-
1937
- 1937-06-23 GB GB1749737A patent/GB497672A/en not_active Expired
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