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GB557266A - Improvements in and relating to acoustic systems and apparatus - Google Patents

Improvements in and relating to acoustic systems and apparatus

Info

Publication number
GB557266A
GB557266A GB629842A GB629842A GB557266A GB 557266 A GB557266 A GB 557266A GB 629842 A GB629842 A GB 629842A GB 629842 A GB629842 A GB 629842A GB 557266 A GB557266 A GB 557266A
Authority
GB
United Kingdom
Prior art keywords
class
relating
diaphragm
acoustic systems
recording
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
GB629842A
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.)
WALTER HEWIT ALLAN
Original Assignee
WALTER HEWIT ALLAN
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 WALTER HEWIT ALLAN filed Critical WALTER HEWIT ALLAN
Priority to GB629842A priority Critical patent/GB557266A/en
Publication of GB557266A publication Critical patent/GB557266A/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
    • H04R23/00—Transducers other than those covered by groups H04R9/00 - H04R21/00
    • H04R23/008—Transducers other than those covered by groups H04R9/00 - H04R21/00 using optical signals for detecting or generating sound

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Abstract

557,266. Oscillographs. ALLAN, W. H. May 9, 1942, No. 6298. [Class 37] [Also in Group XXXIX] For recording sound, a diaphragm 2, 4 vibrated directly by the sound waves or indirectly through the electromagnetic means, carries a mirror 15 which reflects and focuses light from a source 16 on to a recording film 17. The diaphragm consists of a rigid control portion 4 with a flexible surround 2, preferably of rubber, and forms part of the outer wall of a sealed gas-tight enclosure 1 in which the pressure is sub-atmospheric. Specification 131,041, [Class 40 (iv)], is referred to.
GB629842A 1942-05-09 1942-05-09 Improvements in and relating to acoustic systems and apparatus Expired GB557266A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB629842A GB557266A (en) 1942-05-09 1942-05-09 Improvements in and relating to acoustic systems and apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB629842A GB557266A (en) 1942-05-09 1942-05-09 Improvements in and relating to acoustic systems and apparatus

Publications (1)

Publication Number Publication Date
GB557266A true GB557266A (en) 1943-11-12

Family

ID=9811950

Family Applications (1)

Application Number Title Priority Date Filing Date
GB629842A Expired GB557266A (en) 1942-05-09 1942-05-09 Improvements in and relating to acoustic systems and apparatus

Country Status (1)

Country Link
GB (1) GB557266A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999029139A3 (en) * 1997-12-03 1999-08-05 Sennheiser Electronic Optical acoustic sensor, especially a microphone, with an addtional reflection device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999029139A3 (en) * 1997-12-03 1999-08-05 Sennheiser Electronic Optical acoustic sensor, especially a microphone, with an addtional reflection device

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