GB257920A - Improvements relating to the reproduction of sound - Google Patents

Improvements relating to the reproduction of sound

Info

Publication number
GB257920A
GB257920A GB21129/26A GB2112926A GB257920A GB 257920 A GB257920 A GB 257920A GB 21129/26 A GB21129/26 A GB 21129/26A GB 2112926 A GB2112926 A GB 2112926A GB 257920 A GB257920 A GB 257920A
Authority
GB
United Kingdom
Prior art keywords
cell
slit
record
reproduction
projected
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
GB21129/26A
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 GB257920A publication Critical patent/GB257920A/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
    • G11B7/28—Re-recording, i.e. transcribing information from one optical record carrier on to one or more similar or dissimilar record carriers

Landscapes

  • Optical Recording Or Reproduction (AREA)

Abstract

257,920. Poulsen, A., and Petersen, A. C. G. Sept. 3, 1925, [Convention date]. Optical apparatus. - In the reproduction of sound recorded photographically on a film by the projection of light therethrough on to a photoelectric cell in the reproduction circuit, an imageof the record projected on to the cell, or on to a slit in front thereof, is distorted unequally in directions corresponding to the motion of the film and transverse thereto so that the image conforms to the length and width of the cell or slit. This may be effected by inserting two cylindrical lenses c, C at right-angles to one another between the illuminated record s and the cell or slit F which occupies the position at the intersection of images b, B which would be projected by the lenses considered separately. In another arrangement, the lens adjacent the record may be a condensing or spherical lens.
GB21129/26A 1925-09-03 1926-08-27 Improvements relating to the reproduction of sound Expired GB257920A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE257920X 1925-09-03

Publications (1)

Publication Number Publication Date
GB257920A true GB257920A (en) 1927-03-03

Family

ID=5966586

Family Applications (1)

Application Number Title Priority Date Filing Date
GB21129/26A Expired GB257920A (en) 1925-09-03 1926-08-27 Improvements relating to the reproduction of sound

Country Status (1)

Country Link
GB (1) GB257920A (en)

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