GB508672A - Improvements in or relating to stereophonic sound recording - Google Patents

Improvements in or relating to stereophonic sound recording

Info

Publication number
GB508672A
GB508672A GB7602/39A GB760239A GB508672A GB 508672 A GB508672 A GB 508672A GB 7602/39 A GB7602/39 A GB 7602/39A GB 760239 A GB760239 A GB 760239A GB 508672 A GB508672 A GB 508672A
Authority
GB
United Kingdom
Prior art keywords
records
sound
stereophonic
march
channels
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
GB7602/39A
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.)
Electrical Research Products Inc
Original Assignee
Electrical Research Products Inc
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 Electrical Research Products Inc filed Critical Electrical Research Products Inc
Publication of GB508672A publication Critical patent/GB508672A/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

508,672. Binaural and directional systems. ELECTRICAL RESEARCH PRODUCTS, Inc. March 9, 1939, No. 7602. Convention date, March 22, 1938. [Class 40 (iv)] In stereophonic sound recording, particularly in connection with talking pictures, two records 74, 75 are first made by means of " close-up " and " distant " microphones respectively, so that one contains mainly direct sound energy and the other mainly reverberant energy, and these records are then reproduced simultaneously over re-recording channels 13, 14 in which the sound currents are combined in adjustable proportions by means of volume controls 78, 79, 22, 23, 26, 27, to produce two records 87, 88 which may be reproduced by spaced loudspeakers to give a desired stereophonic effect. The two records may be side by side on the talking picture film so that both may be scanned by single-channel reprodacing apparatus in theatres not equipped with stereophonic apparatus. The picture record may be projected as a guide to the operator in making the adjustments, and the sound may be produced by spaced loudspeakers 84, 85 fed from the channels 13, 14. Specifications 435,980, 454,161, and 479,083, [Group XXXVIII], are referred to.
GB7602/39A 1938-03-22 1939-03-09 Improvements in or relating to stereophonic sound recording Expired GB508672A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US508672XA 1938-03-22 1938-03-22

Publications (1)

Publication Number Publication Date
GB508672A true GB508672A (en) 1939-07-04

Family

ID=21967977

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7602/39A Expired GB508672A (en) 1938-03-22 1939-03-09 Improvements in or relating to stereophonic sound recording

Country Status (1)

Country Link
GB (1) GB508672A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE760054C (en) * 1940-09-18 1954-04-12 Tobis Tonbild Syndikat G M B H Process for producing low-noise sound recordings

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE760054C (en) * 1940-09-18 1954-04-12 Tobis Tonbild Syndikat G M B H Process for producing low-noise sound recordings

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