GB1352569A - Recording and reproduction of sound - Google Patents

Recording and reproduction of sound

Info

Publication number
GB1352569A
GB1352569A GB1481071A GB1481071A GB1352569A GB 1352569 A GB1352569 A GB 1352569A GB 1481071 A GB1481071 A GB 1481071A GB 1481071 A GB1481071 A GB 1481071A GB 1352569 A GB1352569 A GB 1352569A
Authority
GB
United Kingdom
Prior art keywords
sound
modulated
playback
diffraction grating
light source
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
GB1481071A
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.)
Agfa Gevaert AG
Original Assignee
Agfa Gevaert AG
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 Agfa Gevaert AG filed Critical Agfa Gevaert AG
Publication of GB1352569A publication Critical patent/GB1352569A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording 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
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/14—Heads, e.g. forming of the optical beam spot or modulation of the optical beam specially adapted to record on, or to reproduce from, more than one track simultaneously
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording 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
    • G11B7/002—Recording, reproducing or erasing systems characterised by the shape or form of the carrier
    • G11B7/003—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with webs, filaments or wires, e.g. belts, spooled tapes or films of quasi-infinite extent
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording 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
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/0065—Recording, reproducing or erasing by using optical interference patterns, e.g. holograms

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

1352569 Holographic sound recording and playback AGFA-GEVAERT A G 13 May 1971 [13 May 1970] 14810/71 Heading G2J [Also in Divisions G4-6] Sound is recorded on a moving photo-sensitive medium in the form of a modulated intensity pattern which acts as a diffraction grating. As shown, Fig. 1, the intensity pattern 1a is produced as a hologram by means of the interference of two partial beams of a sound-modulated light beam issuing from a coherent light source 3. Alternatively, Fig. 2, a diffraction grating 12 is imaged on the record medium 9 by the sound-modulated light beam. A pulse frequency may be superimposed on the sound signals, the light source possibly being a pulsed laser. In playback, Fig. 4, (not shown), a sound signal is derived from the intensity of light diffracted through a given angle by the record. Several sound tracks having different grating constants may be mutually superimposed, Figs. 5 and 6, (not shown).
GB1481071A 1970-05-13 1971-05-13 Recording and reproduction of sound Expired GB1352569A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702023424 DE2023424A1 (en) 1970-05-13 1970-05-13 Methods and devices for optical sound recording

Publications (1)

Publication Number Publication Date
GB1352569A true GB1352569A (en) 1974-05-08

Family

ID=5771020

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1481071A Expired GB1352569A (en) 1970-05-13 1971-05-13 Recording and reproduction of sound

Country Status (4)

Country Link
BE (1) BE766905A (en)
DE (1) DE2023424A1 (en)
FR (1) FR2091164A5 (en)
GB (1) GB1352569A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2133574A (en) * 1982-10-15 1984-07-25 Applied Holographics Making holograms
GB2152695A (en) * 1984-01-06 1985-08-07 Applied Holographics Information storage and retrieval
GB2323933A (en) * 1997-04-02 1998-10-07 Ian Douglas Eustace Image maker

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2133574A (en) * 1982-10-15 1984-07-25 Applied Holographics Making holograms
GB2152695A (en) * 1984-01-06 1985-08-07 Applied Holographics Information storage and retrieval
GB2323933A (en) * 1997-04-02 1998-10-07 Ian Douglas Eustace Image maker
GB2323933B (en) * 1997-04-02 2001-09-19 Ian Douglas Eustace Image maker

Also Published As

Publication number Publication date
DE2023424A1 (en) 1971-11-25
FR2091164A5 (en) 1972-01-14
BE766905A (en) 1971-11-10

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees