FR870749A - Test track sound reproduction method and apparatus - Google Patents

Test track sound reproduction method and apparatus

Info

Publication number
FR870749A
FR870749A FR870749DA FR870749A FR 870749 A FR870749 A FR 870749A FR 870749D A FR870749D A FR 870749DA FR 870749 A FR870749 A FR 870749A
Authority
FR
France
Prior art keywords
sound reproduction
reproduction method
test track
track sound
test
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.)
RCA Corp
Original Assignee
RCA Corp
Radio Corporation of America
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 RCA Corp, Radio Corporation of America filed Critical RCA Corp
Application granted granted Critical
Publication of FR870749A publication Critical patent/FR870749A/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
FR870749D 1940-03-30 1941-03-11 Test track sound reproduction method and apparatus Expired FR870749A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US326912A US2308456A (en) 1940-03-30 1940-03-30 Control track sound reproducer

Publications (1)

Publication Number Publication Date
FR870749A true FR870749A (en) 1942-03-23

Family

ID=23274277

Family Applications (1)

Application Number Title Priority Date Filing Date
FR870749D Expired FR870749A (en) 1940-03-30 1941-03-11 Test track sound reproduction method and apparatus

Country Status (2)

Country Link
US (1) US2308456A (en)
FR (1) FR870749A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2492160A (en) * 1945-12-03 1949-12-27 John P Lekas Multitone keyer
US2529097A (en) * 1947-01-06 1950-11-07 Palmer Films Inc W A Sound recording and reproducing system with recorded control signal

Also Published As

Publication number Publication date
US2308456A (en) 1943-01-12

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