GB490033A - Process and device for effecting sound recordings free from background noises, so-called "noiseless" recordings - Google Patents

Process and device for effecting sound recordings free from background noises, so-called "noiseless" recordings

Info

Publication number
GB490033A
GB490033A GB29597/36A GB2959736A GB490033A GB 490033 A GB490033 A GB 490033A GB 29597/36 A GB29597/36 A GB 29597/36A GB 2959736 A GB2959736 A GB 2959736A GB 490033 A GB490033 A GB 490033A
Authority
GB
United Kingdom
Prior art keywords
recordings
light source
noiseless
recording
toe
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
GB29597/36A
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.)
CINEMA TIRAGE L MAURICE
Original Assignee
CINEMA TIRAGE L MAURICE
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 CINEMA TIRAGE L MAURICE filed Critical CINEMA TIRAGE L MAURICE
Publication of GB490033A publication Critical patent/GB490033A/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

  • Electrophotography Using Other Than Carlson'S Method (AREA)

Abstract

490,033. Optical sound - recording. CINEMA-TIRAGE L. MAURICE. Oct. 30, 1936, No. 29597. Void. Convention date, Jan. 13. [Class 40 (ii)] A variable-density negative sound-record is given a " noiseless " effect by an increase of the average density of the modulation produced by exposure to an additional light source 6, Fig. 4, operating only during periods of modulation of the main light source 2. The additional exposure may be on the same side of the film 5 or on the back ; in the latter case, the film may have a double layer. The two exposures may be superimposed or recorded side by side ; in the latter case the two negatives are superimposed for printing the positive. This process may be used in " toe-recording " effected in the toe of the sensitometric curve. The additional light source 6 may be a glow-tube in the anode circuit of a triode 10, Fig. 6, biassed for delayed anode bend rectification and fed by a transformer 11 from the output of the recording amplifier, potentiometers, resistances and condensers being provided for adjustments.
GB29597/36A 1936-01-13 1936-10-30 Process and device for effecting sound recordings free from background noises, so-called "noiseless" recordings Expired GB490033A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR490033X 1936-01-13

Publications (1)

Publication Number Publication Date
GB490033A true GB490033A (en) 1938-08-04

Family

ID=8904315

Family Applications (1)

Application Number Title Priority Date Filing Date
GB29597/36A Expired GB490033A (en) 1936-01-13 1936-10-30 Process and device for effecting sound recordings free from background noises, so-called "noiseless" recordings

Country Status (1)

Country Link
GB (1) GB490033A (en)

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