GB789069A - Electro-acoustic apparatus - Google Patents

Electro-acoustic apparatus

Info

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
Application number
GB881454A
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
Priority to GB881454A priority Critical patent/GB789069A/en
Publication of GB789069A publication Critical patent/GB789069A/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

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.
GB881454A 1954-03-25 1954-03-25 Electro-acoustic apparatus Expired GB789069A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (2)

* Cited by examiner, † Cited by third party
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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