GB470137A - Improvements in or relating to the reduction of ground noise in sound recording - Google Patents

Improvements in or relating to the reduction of ground noise in sound recording

Info

Publication number
GB470137A
GB470137A GB2473636A GB2473636A GB470137A GB 470137 A GB470137 A GB 470137A GB 2473636 A GB2473636 A GB 2473636A GB 2473636 A GB2473636 A GB 2473636A GB 470137 A GB470137 A GB 470137A
Authority
GB
United Kingdom
Prior art keywords
light
shutter
film
ground noise
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
GB2473636A
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.)
Klangfilm GmbH
Original Assignee
Klangfilm GmbH
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 Klangfilm GmbH filed Critical Klangfilm GmbH
Priority to GB2473636A priority Critical patent/GB470137A/en
Publication of GB470137A publication Critical patent/GB470137A/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

470,137. Optical sound recording. ELLIS, G. B. (Klangfilm Ges.) Sept. 10, 1936, No. 24736. [Class 40 (ii)] An apparatus for recording sound on films with reduced ground noise is adapted to produce selectively either (1) a negative with reduced ground noise ready for direct reproduction, or (2) a negative from which are obtained positives with reduced ground noise for reproduction. In one form, Fig. 1, light from a source 11 passes through screen 17 and lens 19 to oscillating mirror 18 and thence through anti-groundnoise shutter 16, slot 15, and objective 13 to film 14, where a record of single-hump, doublehump, multiple-hump, or variable density is produced according to shape or nature of screen 17. The side of the shutter 16 facing the film is mirrored to reflect light from a source 12 or from the source 11 on to the film. In another form, Fig. 3, light from a source 1 passes through condenser 2 and screen 3 to recording element 4 and thence through prism 5, shutters 7, 8, and optical device 12 to film 13 ; and light from the same source 1 passes through condenser 2, prism 6, shutters 7, 8 and optical device 12 to film. The shutter 7 has separate slots 7<1>, 7<11> for the separate beams of light, and the shutter 8 has a wider slot 15, 16, Fig. 4, and is controlled by a device 9 for anti-ground-noise effect. Alternatively, the shutter 8 may be replaced by two separate shutters. In either form, when a negative free from ground noise ready for direct reproduction is desired, the second light beam is put in operation, and when a negative yielding positives free from ground noise is desired, the second light beam is switched off, deflected or shuttered.
GB2473636A 1936-09-10 1936-09-10 Improvements in or relating to the reduction of ground noise in sound recording Expired GB470137A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2473636A GB470137A (en) 1936-09-10 1936-09-10 Improvements in or relating to the reduction of ground noise in sound recording

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2473636A GB470137A (en) 1936-09-10 1936-09-10 Improvements in or relating to the reduction of ground noise in sound recording

Publications (1)

Publication Number Publication Date
GB470137A true GB470137A (en) 1937-08-10

Family

ID=10216442

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2473636A Expired GB470137A (en) 1936-09-10 1936-09-10 Improvements in or relating to the reduction of ground noise in sound recording

Country Status (1)

Country Link
GB (1) GB470137A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2885490A (en) * 1954-12-22 1959-05-05 Rca Corp Direct positive sound recording system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2885490A (en) * 1954-12-22 1959-05-05 Rca Corp Direct positive sound recording system

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