FR707432A - Improvements to sound reproduction systems - Google Patents

Improvements to sound reproduction systems

Info

Publication number
FR707432A
FR707432A FR707432DA FR707432A FR 707432 A FR707432 A FR 707432A FR 707432D A FR707432D A FR 707432DA FR 707432 A FR707432 A FR 707432A
Authority
FR
France
Prior art keywords
sound reproduction
reproduction systems
systems
sound
reproduction
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.)
Compagnie Francaise Thomson Houston SA
Original Assignee
Compagnie Francaise Thomson Houston SA
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 Compagnie Francaise Thomson Houston SA filed Critical Compagnie Francaise Thomson Houston SA
Application granted granted Critical
Publication of FR707432A publication Critical patent/FR707432A/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
FR707432D 1929-12-13 1930-12-12 Improvements to sound reproduction systems Expired FR707432A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US707432XA 1929-12-13 1929-12-13

Publications (1)

Publication Number Publication Date
FR707432A true FR707432A (en) 1931-07-08

Family

ID=22097108

Family Applications (1)

Application Number Title Priority Date Filing Date
FR707432D Expired FR707432A (en) 1929-12-13 1930-12-12 Improvements to sound reproduction systems

Country Status (1)

Country Link
FR (1) FR707432A (en)

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