GB432811A - An improved method of, and apparatus for, recording sound - Google Patents

An improved method of, and apparatus for, recording sound

Info

Publication number
GB432811A
GB432811A GB3739/34A GB373934A GB432811A GB 432811 A GB432811 A GB 432811A GB 3739/34 A GB3739/34 A GB 3739/34A GB 373934 A GB373934 A GB 373934A GB 432811 A GB432811 A GB 432811A
Authority
GB
United Kingdom
Prior art keywords
diaphragm
sound
recording
air
sounds
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
GB3739/34A
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.)
RCA Corp
Original Assignee
RCA Corp
Radio Corporation of America
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 RCA Corp, Radio Corporation of America filed Critical RCA Corp
Publication of GB432811A publication Critical patent/GB432811A/en
Expired legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B3/00Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor

Landscapes

  • Optical Recording Or Reproduction (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)

Abstract

432,811. Recording sound. RADIO CORPORATION OF AMERICA, 30, Rockefeller Plaza, New York, U.S.A. Feb. 5, 1934, No. 3739. Convention date, Feb. 24, 1933. [Class 40 (ii)] Relates to soundrecording apparatus in which the sound waves impinge on a diaphragm which directly effects the recording. According to the invention, in usng such a device for producing a variable-width photographic record that gives a minimum of background noise on reproduction, the diaphragm is biassed by a pressure dependent on the volume of the sound being recorded. The invention is stated to be applicable also to recording by means of a phonograph stylus or the like. As shown, a diaphragm 20 in a sound-box 10 is connected bv a rod 22 to the vibratory support 23 of a light-reflector, which may be a lens mirror (not shown). Using an optical system of the ordinary kind, light is reflected from the mirror through a slit on to a photographic film. The back 25 of the soundbox has an aperture 26, covered by a resilient flap 27, and the rod 22 is surrounded by a rubber &c. washer 28 where it passes through the back 25, to prevent air leakage. When sounds of large amplitude vibrate the diaphragm, air escapes past the valve 27, producing a large biassing pressure on the diaphragm, since the rate at which air returns to the chamber behind the diaphragm is small. With sounds of relatively small amplitude, little air is ejected through the valve 27, and the bias pressure is low. Thus, the arrangement produces a record such as is shown in Fig. 2, the zero line of the oscillations being shifted in accordance with the amplitudes.
GB3739/34A 1933-02-24 1934-02-05 An improved method of, and apparatus for, recording sound Expired GB432811A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US658345A US1971442A (en) 1933-02-24 1933-02-24 Phonographic apparatus

Publications (1)

Publication Number Publication Date
GB432811A true GB432811A (en) 1935-08-02

Family

ID=24640866

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3739/34A Expired GB432811A (en) 1933-02-24 1934-02-05 An improved method of, and apparatus for, recording sound

Country Status (4)

Country Link
US (1) US1971442A (en)
DE (1) DE619410C (en)
FR (1) FR768949A (en)
GB (1) GB432811A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3239827A (en) * 1960-01-12 1966-03-08 Rosemount Eng Co Ltd High precision pressure standard
US4219099A (en) * 1977-10-11 1980-08-26 Bernard Sacks Acoustic reproduction transducer enclosure
DE102010043859A1 (en) * 2010-11-12 2012-05-16 BSH Bosch und Siemens Hausgeräte GmbH Beverage preparation device with different sound images

Also Published As

Publication number Publication date
DE619410C (en) 1935-09-30
US1971442A (en) 1934-08-28
FR768949A (en) 1934-08-16

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