US3784744A - Decoders for quadruphonic sound utilizing wave matching logic - Google Patents

Decoders for quadruphonic sound utilizing wave matching logic Download PDF

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Publication number
US3784744A
US3784744A US00118271A US3784744DA US3784744A US 3784744 A US3784744 A US 3784744A US 00118271 A US00118271 A US 00118271A US 3784744D A US3784744D A US 3784744DA US 3784744 A US3784744 A US 3784744A
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US
United States
Prior art keywords
signals
phase
signal
composite signals
composite
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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 - Lifetime
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US00118271A
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English (en)
Inventor
B Bauer
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CBS Broadcasting Inc
Sony Music Holdings Inc
Original Assignee
Columbia Broadcasting System Inc
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Application filed by Columbia Broadcasting System Inc filed Critical Columbia Broadcasting System Inc
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Publication of US3784744A publication Critical patent/US3784744A/en
Assigned to CBS RECORDS, INC., 51 WEST 52ND STREET, NEW YORK, NEW YORK 10019, A CORP. OF DE reassignment CBS RECORDS, INC., 51 WEST 52ND STREET, NEW YORK, NEW YORK 10019, A CORP. OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: CBS INC.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00992—Circuits for stereophonic or quadraphonic recording or reproducing
    • 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

Definitions

  • Each of the gain control amplifiers 1106 has a control electrode 118, 120, 122 and 124, respectively, application of a control voltage to which varies the gain of the amplifier.
  • the gain control amplifiers may embody a variable gain vacuum tube, a suitable variable gain transistor, or any suitable vario-losser circuit, or other well known technique for providing variable gain in response to an applied voltage.
  • the control voltage E, from subtractor circuit 82 is applied in parallel to control terminals 118 and 1124 of amplifiers 100 and 106, respectively, to control the gains of the front loudspeakers, and the control signal E is applied in parallel to the control electrodes 120 and 1122 to control the amplification of signals applied to respective back loudspeakers.
  • decoder apparatus adapted to receive first and second composite signals L and R respectively containing dominant signals L; and R, and each including two sub-dominant signal components L, and R said signal component L, being of substantially equal magnitude and in substantially quadrature relationship in said first and second composite signals, and in one of said first and second composite signals in leading relationship with that in the other, and said signal component R, being of substantially equal magnitude and in substantially quadrature relationship in said first and second composite signals, and in said one of said first and second signals in lagging relationship with that in the other, and including at least two phase-shifting networks operative to shift the phase of one of said first and second composite signals relative to the other by substantially 9ll to cause the signal components L and R in one of said relatively phaseshifted composite signals to be in phase coincidence or in phase opposition with corresponding signal components in the other relatively phaseshifted composite signal, combining networks operative to derive from said relatively phase-shifted composite signals third and fourth composite sig nals respectively containing dominant signal components L and R and each including two subdom inant signal components L; and R said

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (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)
  • Stereophonic System (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Stereo-Broadcasting Methods (AREA)
US00118271A 1971-02-24 1971-02-24 Decoders for quadruphonic sound utilizing wave matching logic Expired - Lifetime US3784744A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US11827171A 1971-02-24 1971-02-24

Publications (1)

Publication Number Publication Date
US3784744A true US3784744A (en) 1974-01-08

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ID=22377557

Family Applications (1)

Application Number Title Priority Date Filing Date
US00118271A Expired - Lifetime US3784744A (en) 1971-02-24 1971-02-24 Decoders for quadruphonic sound utilizing wave matching logic

Country Status (11)

Country Link
US (1) US3784744A (enrdf_load_stackoverflow)
JP (1) JPS5240561B1 (enrdf_load_stackoverflow)
AU (1) AU460098B2 (enrdf_load_stackoverflow)
BE (1) BE777215A (enrdf_load_stackoverflow)
CA (1) CA981589A (enrdf_load_stackoverflow)
DE (1) DE2208099C3 (enrdf_load_stackoverflow)
FR (1) FR2126176B1 (enrdf_load_stackoverflow)
GB (2) GB1379771A (enrdf_load_stackoverflow)
IL (1) IL38130A (enrdf_load_stackoverflow)
IT (1) IT948394B (enrdf_load_stackoverflow)
NL (1) NL7115538A (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3883692A (en) * 1972-06-16 1975-05-13 Sony Corp Decoder apparatus with logic circuit for use with a four channel stereo
DE2456376A1 (de) * 1973-11-29 1975-06-05 Sony Corp Decodierer zum wiedergeben von vier getrennten informationssignalen
US3911222A (en) * 1970-12-09 1975-10-07 Kenwood Corp Method and a device for producing a 4-channel stereophonic sound field
DE3607610A1 (de) * 1985-03-07 1986-09-18 Dolby Laboratories Licensing Corp., San Francisco, Calif. Decoder
US5046098A (en) * 1985-03-07 1991-09-03 Dolby Laboratories Licensing Corporation Variable matrix decoder with three output channels

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3632886A (en) * 1969-12-29 1972-01-04 Peter Scheiber Quadrasonic sound system
US3708631A (en) * 1970-06-08 1973-01-02 Columbia Broadcasting Syst Inc Quadraphonic reproducing system with gain control

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3632886A (en) * 1969-12-29 1972-01-04 Peter Scheiber Quadrasonic sound system
US3708631A (en) * 1970-06-08 1973-01-02 Columbia Broadcasting Syst Inc Quadraphonic reproducing system with gain control

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
4 Channels and Compatibility by Schiebes Audio Engineering Society Preprint Oct. 12 15, 1970. *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3911222A (en) * 1970-12-09 1975-10-07 Kenwood Corp Method and a device for producing a 4-channel stereophonic sound field
US3883692A (en) * 1972-06-16 1975-05-13 Sony Corp Decoder apparatus with logic circuit for use with a four channel stereo
DE2456376A1 (de) * 1973-11-29 1975-06-05 Sony Corp Decodierer zum wiedergeben von vier getrennten informationssignalen
DE3607610A1 (de) * 1985-03-07 1986-09-18 Dolby Laboratories Licensing Corp., San Francisco, Calif. Decoder
US4799260A (en) * 1985-03-07 1989-01-17 Dolby Laboratories Licensing Corporation Variable matrix decoder
US5046098A (en) * 1985-03-07 1991-09-03 Dolby Laboratories Licensing Corporation Variable matrix decoder with three output channels

Also Published As

Publication number Publication date
JPS5240561B1 (enrdf_load_stackoverflow) 1977-10-13
FR2126176A1 (enrdf_load_stackoverflow) 1972-10-06
GB1379771A (en) 1975-01-08
DE2208099C3 (de) 1979-03-01
NL7115538A (enrdf_load_stackoverflow) 1972-08-28
AU3710771A (en) 1973-06-28
AU460098B2 (en) 1975-04-17
IL38130A0 (en) 1972-01-27
DE2208099B2 (de) 1978-07-06
CA981589A (en) 1976-01-13
FR2126176B1 (enrdf_load_stackoverflow) 1976-04-30
IT948394B (it) 1973-05-30
DE2208099A1 (de) 1972-09-07
BE777215A (fr) 1972-06-23
GB1387873A (en) 1975-03-19
IL38130A (en) 1974-09-10

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Legal Events

Date Code Title Description
AS Assignment

Owner name: CBS RECORDS, INC., 51 WEST 52ND STREET, NEW YORK,

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:CBS INC.;REEL/FRAME:004809/0935

Effective date: 19871130