FR2094122B1 - - Google Patents

Info

Publication number
FR2094122B1
FR2094122B1 FR7120764A FR7120764A FR2094122B1 FR 2094122 B1 FR2094122 B1 FR 2094122B1 FR 7120764 A FR7120764 A FR 7120764A FR 7120764 A FR7120764 A FR 7120764A FR 2094122 B1 FR2094122 B1 FR 2094122B1
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
FR7120764A
Other versions
FR2094122A1 (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.)
COLUMBIA BROADCASTING
Original Assignee
COLUMBIA BROADCASTING
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 COLUMBIA BROADCASTING filed Critical COLUMBIA BROADCASTING
Publication of FR2094122A1 publication Critical patent/FR2094122A1/fr
Application granted granted Critical
Publication of FR2094122B1 publication Critical patent/FR2094122B1/fr
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S3/00—Systems employing more than two channels, e.g. quadraphonic
    • H04S3/02—Systems employing more than two channels, e.g. quadraphonic of the matrix type, i.e. in which input signals are combined algebraically, e.g. after having been phase shifted with respect to each other

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Algebra (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Analysis (AREA)
  • Mathematical Optimization (AREA)
  • Mathematical Physics (AREA)
  • Pure & Applied Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Stereophonic System (AREA)
FR7120764A 1970-06-08 1971-06-08 Expired FR2094122B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US4419670A 1970-06-08 1970-06-08

Publications (2)

Publication Number Publication Date
FR2094122A1 FR2094122A1 (fr) 1972-02-04
FR2094122B1 true FR2094122B1 (fr) 1976-12-03

Family

ID=21931011

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7120764A Expired FR2094122B1 (fr) 1970-06-08 1971-06-08

Country Status (7)

Country Link
US (1) US3708631A (fr)
JP (1) JPS5017843B1 (fr)
BE (1) BE768184A (fr)
CA (1) CA961417A (fr)
FR (1) FR2094122B1 (fr)
GB (1) GB1347994A (fr)
NL (1) NL7106252A (fr)

Families Citing this family (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3787622A (en) * 1971-02-05 1974-01-22 Sansui Electric Co Quadrasonic sound system for two channel transmission
US3784744A (en) * 1971-02-24 1974-01-08 Columbia Broadcasting Syst Inc Decoders for quadruphonic sound utilizing wave matching logic
US3967063A (en) * 1971-06-23 1976-06-29 Cbs Inc. Logic for matrix systems for reproducing quadraphonic sound
US3830978A (en) * 1971-07-08 1974-08-20 Matsushita Electric Ind Co Ltd Circuit for mixing four audio input signals to produce four audio output signals
JPS5213082B1 (fr) * 1971-07-19 1977-04-12
GB1398786A (en) * 1971-08-06 1975-06-25 Sony Corp Multisignal transmission apparatus
US3794781A (en) * 1971-09-01 1974-02-26 Columbia Broadcasting Syst Inc Four channel decoder with improved gain control
US3824618A (en) * 1971-10-07 1974-07-16 Pioneer Electronic Corp Magnetic head and simulated four-channel stereo system
US3772479A (en) * 1971-10-19 1973-11-13 Motorola Inc Gain modified multi-channel audio system
US3783192A (en) * 1971-12-30 1974-01-01 Sansui Electric Co Decoder for use in matrix four-channel system
JPS5240563B2 (fr) * 1972-03-07 1977-10-13
JPS5228361B2 (fr) * 1972-03-09 1977-07-26
JPS5317283B2 (fr) * 1973-03-07 1978-06-07
GB1522599A (en) * 1974-11-16 1978-08-23 Dolby Laboratories Inc Centre channel derivation for stereophonic cinema sound
US4018992A (en) * 1975-09-25 1977-04-19 Clifford H. Moulton Decoder for quadraphonic playback
US4006306A (en) * 1975-10-10 1977-02-01 Yudin Industries, Inc. Audio signal processing apparatus
US4474441A (en) * 1980-03-04 1984-10-02 Polaroid Corporation Method and apparatus for controlling exposure by selective use of blocking visible filter
US4532647A (en) * 1981-08-19 1985-07-30 John C. Bogue Automatic dimension control for a directional enhancement system
US4525855A (en) * 1981-08-27 1985-06-25 John C. Bogue Variable rate and variable limit dimension controls for a directional enhancement system
US5046098A (en) * 1985-03-07 1991-09-03 Dolby Laboratories Licensing Corporation Variable matrix decoder with three output channels
US4799260A (en) * 1985-03-07 1989-01-17 Dolby Laboratories Licensing Corporation Variable matrix decoder
US5666424A (en) * 1990-06-08 1997-09-09 Harman International Industries, Inc. Six-axis surround sound processor with automatic balancing and calibration
US5172415A (en) * 1990-06-08 1992-12-15 Fosgate James W Surround processor
US5339363A (en) * 1990-06-08 1994-08-16 Fosgate James W Apparatus for enhancing monophonic audio signals using phase shifters
US5504819A (en) * 1990-06-08 1996-04-02 Harman International Industries, Inc. Surround sound processor with improved control voltage generator
US5295189A (en) * 1990-06-08 1994-03-15 Fosgate James W Control voltage generator for surround sound processor
US6925426B1 (en) 2000-02-22 2005-08-02 Board Of Trustees Operating Michigan State University Process for high fidelity sound recording and reproduction of musical sound
GB2514598B (en) * 2013-05-30 2015-04-29 Egils Ranga An optimised three speaker stereo sound system
US20170078793A1 (en) * 2015-03-23 2017-03-16 Eric Jay Alexander Inversion Speaker and Headphone for Music Production

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2098561A (en) * 1934-02-09 1937-11-09 Rca Corp System for producing stereosonic effects
US2126929A (en) * 1936-05-15 1938-08-16 Bell Telephone Labor Inc Sound reproducing system
US3184550A (en) * 1961-06-06 1965-05-18 Admiral Corp Stereophonic system with derived center channel
US3632886A (en) * 1969-12-29 1972-01-04 Peter Scheiber Quadrasonic sound system

Also Published As

Publication number Publication date
FR2094122A1 (fr) 1972-02-04
DE2126480B2 (de) 1976-09-30
US3708631A (en) 1973-01-02
BE768184A (fr) 1971-12-07
NL7106252A (fr) 1971-12-10
CA961417A (en) 1975-01-21
JPS5017843B1 (fr) 1975-06-24
DE2126480A1 (de) 1972-01-27
GB1347994A (en) 1974-02-27

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Legal Events

Date Code Title Description
ST Notification of lapse