GB789069A - Electro-acoustic apparatus - Google Patents
Electro-acoustic apparatusInfo
- Publication number
- GB789069A GB789069A GB881454A GB881454A GB789069A GB 789069 A GB789069 A GB 789069A GB 881454 A GB881454 A GB 881454A GB 881454 A GB881454 A GB 881454A GB 789069 A GB789069 A GB 789069A
- Authority
- GB
- United Kingdom
- Prior art keywords
- diaphragm
- microphone
- width
- profile
- pressure
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R19/00—Electrostatic transducers
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
Abstract
789,069. Diaphragms; electrostatic instruments. SCHAAF. A. March 25, 1954, No. 8814/54. Class 40 (4). In an electrostatic loud-speaker; or microphone, the diaphragm consists of an elongated strip having a profile of arcuate shape when viewed along the direction of its width, and the width of the diaphragm is equal to or less than the wavelength in air at normal temperature and pressure of the highest audio-frequency to be radiated, or utilized, respectively. If the sound is required to be radiated from the loudspeaker, or received by the microphone, uniformly to, or from, different directions, the curvature of the diaphragm is made uniform, the profile becoming a circular arc or a complete circle; whereas for non-uniformity the profile is not a circular arc but a parabolic arc as shown in Fig. 3, in which the arrows represent relative sound levels produced by a loudspeaker. These sound levels may be further altered by varying the width of the strip as illustrated in Fig. 4, so that in the result the sounds reaching listeners 12 (Fig. 3), are all at substantially equal levels. Similar directional characteristics are obtained from a microphone having a diaphragm as shown in Figs. 3 and 4. The microphone may, in known manner, have part of the diaphragm arranged to operate as a pressure receiver and the other part to operate as a pressure-gradient receiver.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB881454A GB789069A (en) | 1954-03-25 | 1954-03-25 | Electro-acoustic apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB881454A GB789069A (en) | 1954-03-25 | 1954-03-25 | Electro-acoustic apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
GB789069A true GB789069A (en) | 1958-01-15 |
Family
ID=9859735
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB881454A Expired GB789069A (en) | 1954-03-25 | 1954-03-25 | Electro-acoustic apparatus |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB789069A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9648437B2 (en) | 2009-08-03 | 2017-05-09 | Imax Corporation | Systems and methods for monitoring cinema loudspeakers and compensating for quality problems |
-
1954
- 1954-03-25 GB GB881454A patent/GB789069A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9648437B2 (en) | 2009-08-03 | 2017-05-09 | Imax Corporation | Systems and methods for monitoring cinema loudspeakers and compensating for quality problems |
US10924874B2 (en) | 2009-08-03 | 2021-02-16 | Imax Corporation | Systems and method for monitoring cinema loudspeakers and compensating for quality problems |
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