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FR685341A - Improvements to sound recording and reproducing systems - Google Patents

Improvements to sound recording and reproducing systems

Info

Publication number
FR685341A
FR685341A FR685341DA FR685341A FR 685341 A FR685341 A FR 685341A FR 685341D A FR685341D A FR 685341DA FR 685341 A FR685341 A FR 685341A
Authority
FR
France
Prior art keywords
sound recording
reproducing systems
reproducing
systems
sound
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
Other languages
French (fr)
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.)
CBS Corp
Original Assignee
Westinghouse Electric and Manufacturing Co
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 Westinghouse Electric and Manufacturing Co filed Critical Westinghouse Electric and Manufacturing Co
Application granted granted Critical
Publication of FR685341A publication Critical patent/FR685341A/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
FR685341D 1928-11-23 1929-11-21 Improvements to sound recording and reproducing systems Expired FR685341A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US321365A US1888724A (en) 1928-11-23 1928-11-23 Sound recording and reproducing system

Publications (1)

Publication Number Publication Date
FR685341A true FR685341A (en) 1930-07-09

Family

ID=23250299

Family Applications (1)

Application Number Title Priority Date Filing Date
FR685341D Expired FR685341A (en) 1928-11-23 1929-11-21 Improvements to sound recording and reproducing systems

Country Status (3)

Country Link
US (1) US1888724A (en)
DE (1) DE646064C (en)
FR (1) FR685341A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE750776C (en) * 1930-09-04 1945-01-26 Electrical Res Prod Inc Device for the production of low-noise optical sound recording
DE751441C (en) * 1930-12-16 1953-03-02 Arnold Poulsen Dipl Ing Method and device for producing a low-noise optical sound recording in sprout script
DE870481C (en) * 1931-08-31 1953-03-12 Western Electric Co Method and device for producing a sound film recording in intensity writing
DE751531C (en) * 1930-09-27 1953-04-27 Arnold Poulsen Dipl Ing Method and device for producing a low-noise sound recording in serrated script
DE883963C (en) * 1931-03-19 1953-07-23 Siemens Ag Process for the production of sound films
DE900144C (en) * 1931-04-09 1953-12-21 Siemens Ag Amplitude-controlled sound recording

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE912024C (en) * 1930-06-25 1954-07-15 Aeg Sound or picture sound recording
DE755731C (en) * 1935-11-07 1953-08-10 Klangfilm G M B H Process for the production of sound film copies with low noise levels
DE961031C (en) * 1943-04-06 1957-03-28 Philips Nv Photoelectric device for converting changes in light intensity into changes in current
US2454169A (en) * 1946-12-26 1948-11-16 Rca Corp Gain control system responsive to an average value
US2547271A (en) * 1948-04-20 1951-04-03 Alberto Laffon Y Soto Means for diminishing background noise

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE750776C (en) * 1930-09-04 1945-01-26 Electrical Res Prod Inc Device for the production of low-noise optical sound recording
DE751531C (en) * 1930-09-27 1953-04-27 Arnold Poulsen Dipl Ing Method and device for producing a low-noise sound recording in serrated script
DE751441C (en) * 1930-12-16 1953-03-02 Arnold Poulsen Dipl Ing Method and device for producing a low-noise optical sound recording in sprout script
DE883963C (en) * 1931-03-19 1953-07-23 Siemens Ag Process for the production of sound films
DE900144C (en) * 1931-04-09 1953-12-21 Siemens Ag Amplitude-controlled sound recording
DE870481C (en) * 1931-08-31 1953-03-12 Western Electric Co Method and device for producing a sound film recording in intensity writing

Also Published As

Publication number Publication date
DE646064C (en) 1937-06-10
US1888724A (en) 1932-11-22

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