FR2221778B1 - - Google Patents

Info

Publication number
FR2221778B1
FR2221778B1 FR7245329A FR7245329A FR2221778B1 FR 2221778 B1 FR2221778 B1 FR 2221778B1 FR 7245329 A FR7245329 A FR 7245329A FR 7245329 A FR7245329 A FR 7245329A FR 2221778 B1 FR2221778 B1 FR 2221778B1
Authority
FR
France
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
FR7245329A
Other versions
FR2221778A1 (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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to FR7245329A priority Critical patent/FR2221778B1/fr
Priority to US05/426,116 priority patent/US3964752A/en
Publication of FR2221778A1 publication Critical patent/FR2221778A1/fr
Application granted granted Critical
Publication of FR2221778B1 publication Critical patent/FR2221778B1/fr
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R11/00—Transducers of moving-armature or moving-core type
    • H04R11/08—Gramophone pick-ups using a stylus; Recorders using a stylus
    • H04R11/10—Gramophone pick-ups using a stylus; Recorders using a stylus comprising two or more styli or transducers

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)
FR7245329A 1972-12-19 1972-12-19 Expired FR2221778B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR7245329A FR2221778B1 (fr) 1972-12-19 1972-12-19
US05/426,116 US3964752A (en) 1972-12-19 1973-12-19 Methods and devices for recording, engraving and reproducing modulated information in tetraphony

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7245329A FR2221778B1 (fr) 1972-12-19 1972-12-19

Publications (2)

Publication Number Publication Date
FR2221778A1 FR2221778A1 (fr) 1974-10-11
FR2221778B1 true FR2221778B1 (fr) 1977-08-26

Family

ID=9108979

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7245329A Expired FR2221778B1 (fr) 1972-12-19 1972-12-19

Country Status (2)

Country Link
US (1) US3964752A (fr)
FR (1) FR2221778B1 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2792454A (en) * 1954-01-21 1957-05-14 Teldec Schallplatten G M B H Storage device
US3075052A (en) * 1957-05-09 1963-01-22 Emi Ltd Methods of producing grooved records
US2977424A (en) * 1957-12-13 1961-03-28 Teldec Telefunken Decca Arrangement for producing a sound recording
US3118977A (en) * 1960-07-01 1964-01-21 Rca Corp Multi-groove stereophonic sound recording and reproducing system
US3223789A (en) * 1961-05-16 1965-12-14 Philips Corp Automatic control of groove spacing in phonograph records
US3632886A (en) * 1969-12-29 1972-01-04 Peter Scheiber Quadrasonic sound system

Also Published As

Publication number Publication date
FR2221778A1 (fr) 1974-10-11
US3964752A (en) 1976-06-22

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Legal Events

Date Code Title Description
CL Concession to grant licences
ST Notification of lapse