FR2393342A1 - SYSTEM FOR EXPLORING AN OPTICAL SOUND TRACK - Google Patents

SYSTEM FOR EXPLORING AN OPTICAL SOUND TRACK

Info

Publication number
FR2393342A1
FR2393342A1 FR7816650A FR7816650A FR2393342A1 FR 2393342 A1 FR2393342 A1 FR 2393342A1 FR 7816650 A FR7816650 A FR 7816650A FR 7816650 A FR7816650 A FR 7816650A FR 2393342 A1 FR2393342 A1 FR 2393342A1
Authority
FR
France
Prior art keywords
sensors
exploring
optical sound
sound track
optical
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.)
Granted
Application number
FR7816650A
Other languages
French (fr)
Other versions
FR2393342B1 (en
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.)
Dolby Laboratories Licensing Corp
Original Assignee
Dolby Laboratories Licensing Corp
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 Dolby Laboratories Licensing Corp filed Critical Dolby Laboratories Licensing Corp
Publication of FR2393342A1 publication Critical patent/FR2393342A1/en
Application granted granted Critical
Publication of FR2393342B1 publication Critical patent/FR2393342B1/fr
Granted 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
    • G11B7/002—Recording, reproducing or erasing systems characterised by the shape or form of the carrier
    • G11B7/003—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with webs, filaments or wires, e.g. belts, spooled tapes or films of quasi-infinite extent
    • G11B7/0032—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with webs, filaments or wires, e.g. belts, spooled tapes or films of quasi-infinite extent for moving-picture soundtracks, i.e. cinema
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
    • G01B11/024—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness by means of diode-array scanning
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/24—Signal processing not specific to the method of recording or reproducing; Circuits therefor for reducing noise
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
    • G11B23/0007—Circuits or methods for reducing noise, for correction of distortion, or for changing density of recorded information

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

L'invention concerne le matériel de reproduction sonore associé aux films cinématographiques. Un dispositif de reproduction de l'information portée par une piste d'enregistrement sonore optique comprend un réseau de capteurs photosensibles 18, associés à des circuits électroniques de combinaison 48, et d'intégration 40. Le nombre de capteurs est choisi en fonction de la granularité de la pellicule photographique, de façon à convertir le bruit de quantification gênant en un bruit aléatoire plus tolérable, tout en réduisant le nombre de capteurs à une valeur admissible en pratique Application aux projecteurs cinématographiques.The invention relates to sound reproduction equipment associated with motion pictures. A device for reproducing information carried by an optical sound recording track comprises an array of photosensitive sensors 18, associated with combination electronic circuits 48, and integration circuits 40. The number of sensors is chosen as a function of the granularity of the photographic film, so as to convert the annoying quantization noise into a more tolerable random noise, while reducing the number of sensors to a value admissible in practice. Application to cinematographic projectors.

FR7816650A 1977-06-03 1978-06-02 SYSTEM FOR EXPLORING AN OPTICAL SOUND TRACK Granted FR2393342A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US80304277A 1977-06-03 1977-06-03

Publications (2)

Publication Number Publication Date
FR2393342A1 true FR2393342A1 (en) 1978-12-29
FR2393342B1 FR2393342B1 (en) 1984-11-16

Family

ID=25185428

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7816650A Granted FR2393342A1 (en) 1977-06-03 1978-06-02 SYSTEM FOR EXPLORING AN OPTICAL SOUND TRACK

Country Status (7)

Country Link
JP (1) JPS542703A (en)
CA (1) CA1124402A (en)
DE (1) DE2823853A1 (en)
FR (1) FR2393342A1 (en)
GB (1) GB1598113A (en)
IT (1) IT1192315B (en)
NL (1) NL189322C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0119101A2 (en) * 1983-03-14 1984-09-19 Dolby Laboratories Licensing Corporation Improvements in stereophonic motion picture photographic sound-tracks and apparatus for recording and playing back photographic sound tracks

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2002214955A1 (en) * 2000-09-11 2002-03-22 Bts Holding International B.V. Device and method for reproducing photographic sound recordings

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR885556A (en) * 1941-08-30 1943-09-20 Philips Nv Method for the electro-optical exploration of oscillation recordings
FR2155373A5 (en) * 1971-09-30 1973-05-18 Siemens Ag
US3959784A (en) * 1974-12-23 1976-05-25 Actron High speed optical read-out of data stored in an array

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3848095A (en) * 1972-12-20 1974-11-12 I O Metrics Corp Three dimensional electro-optical retrieval system
DE2543276A1 (en) * 1975-09-27 1977-03-31 Licentia Gmbh Reproduction system for data carried on tapes - has monochromatic light source and pick-up units for optical signals to be converted to audio output

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR885556A (en) * 1941-08-30 1943-09-20 Philips Nv Method for the electro-optical exploration of oscillation recordings
FR2155373A5 (en) * 1971-09-30 1973-05-18 Siemens Ag
US3959784A (en) * 1974-12-23 1976-05-25 Actron High speed optical read-out of data stored in an array

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
EXBK/73 *
EXBK/78 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0119101A2 (en) * 1983-03-14 1984-09-19 Dolby Laboratories Licensing Corporation Improvements in stereophonic motion picture photographic sound-tracks and apparatus for recording and playing back photographic sound tracks
EP0119101A3 (en) * 1983-03-14 1986-08-27 Dolby Laboratories Licensing Corporation Improvements in stereophonic motion picture photographic sound-tracks and apparatus for recording and playing back photographic sound tracks

Also Published As

Publication number Publication date
IT1192315B (en) 1988-03-31
CA1124402A (en) 1982-05-25
DE2823853A1 (en) 1978-12-14
JPS6250893B2 (en) 1987-10-27
FR2393342B1 (en) 1984-11-16
GB1598113A (en) 1981-09-16
DE2823853C2 (en) 1988-05-19
NL7805719A (en) 1978-12-05
IT7849669A0 (en) 1978-06-02
NL189322B (en) 1992-10-01
JPS542703A (en) 1979-01-10
NL189322C (en) 1993-03-01

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Legal Events

Date Code Title Description
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