GB1379771A - Decoder for quadruphonic sound - Google Patents

Decoder for quadruphonic sound

Info

Publication number
GB1379771A
GB1379771A GB658172A GB658172A GB1379771A GB 1379771 A GB1379771 A GB 1379771A GB 658172 A GB658172 A GB 658172A GB 658172 A GB658172 A GB 658172A GB 1379771 A GB1379771 A GB 1379771A
Authority
GB
United Kingdom
Prior art keywords
signals
channel
reproduction
lagging
loud
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
GB658172A
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.)
CBS Broadcasting Inc
Original Assignee
CBS Inc
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 CBS Inc filed Critical CBS Inc
Publication of GB1379771A publication Critical patent/GB1379771A/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
    • 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

Abstract

1379771 Four loud-speaker stereo systems CBS Inc 11 Feb 1972 [24 Feb 1971] 6581/72 Heading H4R In a matrix for decoding four signals, to be fed to the four loud-speakers of a quadrophonic reproduction system, from two channels in which the original signals L f , L b , R f and R b are combined, as described in Specification 1,347,993, so that each channel carries a respective front signal, R f or L f plus a prop ortion of each of the rear signals R b and L b , in quadrature with each other and respectively leading and lagging the main signal in one channel and lagging and leading the main signal in the other channel, the decoding matrix includes phase shifting circuits 154, 156, 158, 160 connected to derive from the signals in each of the channels two signals bearing a quadrature phase relation, i.e. 162, 184, and 190, 168. Two of these signals, 162, 168, are used direct for reproduction as "front" signals L f <SP>11</SP> and R f <SP>11</SP> and in addition signals from each channel are combined in circuits 182, 188, to provide two signals having respectively predominant Lb and R b components for reproduction as "back" signals. The output signals are fed to the reproducers 170, 172, 174, 176, via amplifiers 178, 180, 186, 192, whose gain is controlled by a logic circuit, Fig. 1b (not shown), which is of the type described in co-pending Application No. 6580/72.
GB658172A 1971-02-24 1972-02-11 Decoder for quadruphonic sound Expired GB1379771A (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
GB1379771A true GB1379771A (en) 1975-01-08

Family

ID=22377557

Family Applications (2)

Application Number Title Priority Date Filing Date
GB658172A Expired GB1379771A (en) 1971-02-24 1972-02-11 Decoder for quadruphonic sound
GB658072A Expired GB1387873A (en) 1971-02-24 1972-02-11 Decoder for quadraphonic sound

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB658072A Expired GB1387873A (en) 1971-02-24 1972-02-11 Decoder for quadraphonic sound

Country Status (11)

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

Families Citing this family (5)

* 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
JPS5645358B2 (en) * 1973-11-29 1981-10-26
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

Family Cites Families (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

Also Published As

Publication number Publication date
CA981589A (en) 1976-01-13
JPS5240561B1 (en) 1977-10-13
BE777215A (en) 1972-06-23
AU3710771A (en) 1973-06-28
IL38130A0 (en) 1972-01-27
DE2208099B2 (en) 1978-07-06
AU460098B2 (en) 1975-04-17
DE2208099C3 (en) 1979-03-01
IL38130A (en) 1974-09-10
NL7115538A (en) 1972-08-28
FR2126176A1 (en) 1972-10-06
GB1387873A (en) 1975-03-19
IT948394B (en) 1973-05-30
US3784744A (en) 1974-01-08
DE2208099A1 (en) 1972-09-07
FR2126176B1 (en) 1976-04-30

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee