GB139497A - Improvements in or relating to electrically operated sound generators - Google Patents
Improvements in or relating to electrically operated sound generatorsInfo
- Publication number
- GB139497A GB139497A GB5737/20A GB573720A GB139497A GB 139497 A GB139497 A GB 139497A GB 5737/20 A GB5737/20 A GB 5737/20A GB 573720 A GB573720 A GB 573720A GB 139497 A GB139497 A GB 139497A
- Authority
- GB
- United Kingdom
- Prior art keywords
- electric
- shell
- frequency
- sounds
- variations
- 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
- H04R19/02—Loudspeakers
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
- Electrophonic Musical Instruments (AREA)
Abstract
139,497. Pupin, M. I. Feb. 4, 1918, [Convention date]. Condenser telephones. - Sound - generating apparatus comprises an electric condenser in the form of a stiff cylinder 3, Fig. 1, mounted within a cylindrical shell 2 by insulating-plugs 4, and connected so as to receive variations of electric potential which cause the shell to vibrate with a frequency corresponding to the frequency of the electric variations. By controlling the electric variations telephonically or otherwise in accordance with speech or musical sounds, the device, or a series of them, may be used as a producer or reproducer of such sounds. The cylinder and shell are preferably made of steel and the space between filled with a dielectric such as compressed air. The shell may be designed so that its natural frequency of vibration coincides with that of the sounds to be produced: the electric circuit may also be tuned to the same frequency. In the arrangement shown in Fig. 3, 14 is an auxiliary condenser in parallel with the oscillator 2, 3, the two being kept charged to a suitable difference of potential by a direct-current source 15 adjustable by means of the resistance 16. The primary 13 of the transformer receives a high-frequency current. To direct the sound waves in the form of a parallel beam, the oscillator may be placed with its axis on the focal line of a cylindrical parabolic mirror.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US215291A US1399877A (en) | 1918-02-04 | 1918-02-04 | Sound-generator |
Publications (1)
Publication Number | Publication Date |
---|---|
GB139497A true GB139497A (en) | 1920-11-11 |
Family
ID=22802394
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB5737/20A Expired GB139497A (en) | 1918-02-04 | 1920-02-25 | Improvements in or relating to electrically operated sound generators |
Country Status (3)
Country | Link |
---|---|
US (1) | US1399877A (en) |
FR (1) | FR507609A (en) |
GB (1) | GB139497A (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2415094A (en) * | 1938-01-17 | 1947-02-04 | Board | Radio measurement of distances and velocities |
US2541944A (en) * | 1946-06-13 | 1951-02-13 | Stromberg Carlson Co | Diaphragm mounting |
US2530971A (en) * | 1947-07-26 | 1950-11-21 | Standard Oil Dev Co | Acoustic well logging apparatus |
US3160715A (en) * | 1960-11-15 | 1964-12-08 | Gussing Nils Torsten Alson | Electrostatic loudspeakers |
US3557899A (en) * | 1967-01-10 | 1971-01-26 | Edward G Longinette | Riot control devices employing a modulated stimulus frequency |
SE415420B (en) * | 1978-05-16 | 1980-09-29 | Klaus Kulper | HIGH EFFICIENCY CONDENSOR WITH GASFUL DIELECTRIC |
-
1918
- 1918-02-04 US US215291A patent/US1399877A/en not_active Expired - Lifetime
-
1919
- 1919-12-20 FR FR507609A patent/FR507609A/en not_active Expired
-
1920
- 1920-02-25 GB GB5737/20A patent/GB139497A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
US1399877A (en) | 1921-12-13 |
FR507609A (en) | 1920-09-20 |
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