GB566356A - Sound recording - Google Patents

Sound recording

Info

Publication number
GB566356A
GB566356A GB7102/43A GB710243A GB566356A GB 566356 A GB566356 A GB 566356A GB 7102/43 A GB7102/43 A GB 7102/43A GB 710243 A GB710243 A GB 710243A GB 566356 A GB566356 A GB 566356A
Authority
GB
United Kingdom
Prior art keywords
sounds
recorded
light
mirror
varying
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
GB7102/43A
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 GB566356A publication Critical patent/GB566356A/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

Abstract

566,356. Optical sound - recording. RADIO CORPORATION OF AMERICA. May 5, 1943, No. 7102. Convention date, May 29, 1942. [Class 40 (ii)] [Also in Groups XXXIX and XL] An optical sound recording apparatus comprises a light source 13, means for varying the light source in accordance with the sounds to be recorded (e.g. microphone 10 with circuits 11, 12), a shutter device 18, 19 for varying the average amount of light transmitted from said source to the film record F in accordance with the average amplitude of the sounds to be recorded, and feed-back means (e.g. circuit B associated with photo-electric cell 23 illuminated by mirror 22 situated in the path of the light beam to the film F) for maintaining the light modulation impressed on the record in correspondence with the sounds to be recorded. The feed-back may be in reverse phase as described in U.S.A. Specification 2,194,175 and re-issue 21907. The mirror 22 may be made as described in the article entitled " A new dichroic reflector and its application to Photocell monitoring systems," by G. L. Dimmick, on pages 36-44 of the Journal of the Society of Motion Picture Engineers, January, 1942. The shutter device may be as described in Specification 494,114, and an amplifier therefor may be as described in Specification 384,742.
GB7102/43A 1942-05-29 1943-05-05 Sound recording Expired GB566356A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US566356XA 1942-05-29 1942-05-29

Publications (1)

Publication Number Publication Date
GB566356A true GB566356A (en) 1944-12-27

Family

ID=22005690

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7102/43A Expired GB566356A (en) 1942-05-29 1943-05-05 Sound recording

Country Status (1)

Country Link
GB (1) GB566356A (en)

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