GB486117A - Improvements in recording sound on films - Google Patents

Improvements in recording sound on films

Info

Publication number
GB486117A
GB486117A GB3228136A GB3228136A GB486117A GB 486117 A GB486117 A GB 486117A GB 3228136 A GB3228136 A GB 3228136A GB 3228136 A GB3228136 A GB 3228136A GB 486117 A GB486117 A GB 486117A
Authority
GB
United Kingdom
Prior art keywords
changes
width
volume
amplifier
variations
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
GB3228136A
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.)
FIDELITY FILMS Ltd
Original Assignee
FIDELITY FILMS Ltd
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 FIDELITY FILMS Ltd filed Critical FIDELITY FILMS Ltd
Priority to GB3228136A priority Critical patent/GB486117A/en
Publication of GB486117A publication Critical patent/GB486117A/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

Landscapes

  • Optical Recording Or Reproduction (AREA)

Abstract

486,117. Electro - optical soundrecording. FIDELITY FILMS, Ltd., and CROWTHER, F. K. Nov. 25, 1936, No. 32281. [Class 40 (ii)] A variable density sound track is recorded at approximately constant amplitude and variations in width are used to indicate volume changes with the exception of sudden changes. A tetrode V1 incorporated in the amplifier is subject to automatic volume control as follows. Transformer T is connected in parallel with the amplifier and when an increasing current flows through rectifier V3 the potential change across R2 reduces the impedance of triode V2 so causing a fall in potential of the screening grid of V1 with a consequent decrease in amplification. The output of the amplifier is connected to the light source used for recording purposes. Variations in width of sound track to represent volume changes are effected by passing the varying anode current of V2 through an electromagnetic device K operating a movable shutter M such that an increase in current increases the width of the recording beam. The inertia of the shutter M renders it unable to follow very sudden changes in volume and by making the time-constant of the A.V.C. system of suitable magnitude these are recorded as changes in density. Thus the variations in width only follow the envelope of the changes in volume.
GB3228136A 1936-11-25 1936-11-25 Improvements in recording sound on films Expired GB486117A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3228136A GB486117A (en) 1936-11-25 1936-11-25 Improvements in recording sound on films

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3228136A GB486117A (en) 1936-11-25 1936-11-25 Improvements in recording sound on films

Publications (1)

Publication Number Publication Date
GB486117A true GB486117A (en) 1938-05-25

Family

ID=10336168

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3228136A Expired GB486117A (en) 1936-11-25 1936-11-25 Improvements in recording sound on films

Country Status (1)

Country Link
GB (1) GB486117A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE760053C (en) * 1940-06-09 1953-01-05 Tobis Tonbild Syndikat G M B H Sound recording with improved dynamics

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE760053C (en) * 1940-06-09 1953-01-05 Tobis Tonbild Syndikat G M B H Sound recording with improved dynamics

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