GB139497A - Improvements in or relating to electrically operated sound generators - Google Patents

Improvements in or relating to electrically operated sound generators

Info

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
Application number
GB5737/20A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of GB139497A publication Critical patent/GB139497A/en
Expired legal-status Critical Current

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.
GB5737/20A 1918-02-04 1920-02-25 Improvements in or relating to electrically operated sound generators Expired GB139497A (en)

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)

* Cited by examiner, † Cited by third party
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

Also Published As

Publication number Publication date
FR507609A (en) 1920-09-20
US1399877A (en) 1921-12-13

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