GB1387874A - Apparatus for recording and reproducing quadraphonic sound - Google Patents

Apparatus for recording and reproducing quadraphonic sound

Info

Publication number: GB1387874A
Authority: GB; United Kingdom
Prior art keywords: channel; signals; phase shift; signal; centre
Prior art date: 1971-03-15
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

GB841272A

Other languages

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.)

1971-03-15

Filing date

1972-02-23

Publication date

1975-03-19

1972-02-23 Application filed by CBS Inc filed Critical CBS Inc

1975-03-19 Publication of GB1387874A publication Critical patent/GB1387874A/en

Status Expired legal-status Critical Current

Links

230000010363 phase shift Effects 0.000 abstract 6
239000011159 matrix material Substances 0.000 abstract 2
230000005540 biological transmission Effects 0.000 abstract 1

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)
Stereo-Broadcasting Methods (AREA)
Magnetic Bearings And Hydrostatic Bearings (AREA)
Compression, Expansion, Code Conversion, And Decoders (AREA)

GB841272A 1971-03-15 1972-02-23 Apparatus for recording and reproducing quadraphonic sound Expired GB1387874A (en)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
US00124135A US3821471A (en)	1971-03-15	1971-03-15	Apparatus for reproducing quadraphonic sound

Publications (1)

Publication Number	Publication Date
GB1387874A true GB1387874A (en)	1975-03-19

Family

ID=22412987

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
GB841272A Expired GB1387874A (en)	1971-03-15	1972-02-23	Apparatus for recording and reproducing quadraphonic sound

Country Status (8)

Country	Link
US (1)	US3821471A (ja)
JP (2)	JPS5110962B2 (ja)
BE (2)	BE780711R (ja)
CA (1)	CA978860A (ja)
DE (1)	DE2209424C3 (ja)
FR (2)	FR2130305B2 (ja)
GB (1)	GB1387874A (ja)
NL (1)	NL7203169A (ja)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
JPS5645358B2 (ja) *	1973-11-29	1981-10-26
JPS5424841B2 (ja) *	1974-02-26	1979-08-24
GB1514162A (en) *	1974-03-25	1978-06-14	Ruggles W	Directional enhancement system for quadraphonic decoders
US3937885A (en) *	1974-09-06	1976-02-10	Motorola, Inc.	Control circuit for a matrixed four channel audio reproducing system
US4018992A (en) *	1975-09-25	1977-04-19	Clifford H. Moulton	Decoder for quadraphonic playback
GB1550627A (en) *	1975-11-13	1979-08-15	Nat Res Dev	Sound reproduction systems
JPS5827645B2 (ja) *	1977-11-24	1983-06-10	株式会社日立製作所	静止誘導機器
US4799260A (en) *	1985-03-07	1989-01-17	Dolby Laboratories Licensing Corporation	Variable matrix decoder
US4941177A (en) *	1985-03-07	1990-07-10	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
US7251337B2 (en)	2003-04-24	2007-07-31	Dolby Laboratories Licensing Corporation	Volume control in movie theaters
KR101133944B1 (ko) *	2004-06-28	2012-04-13	아지노모토 가부시키가이샤	영양 조성물 및 소화관 기능 저하 예방?개선용 조성물
JP4835298B2 (ja) *	2006-07-21	2011-12-14	ソニー株式会社	オーディオ信号処理装置、オーディオ信号処理方法およびプログラム
US11039263B2 (en) *	2019-05-29	2021-06-15	Mark Petrouske	Wide effect sound producing method

1971
- 1971-03-15 US US00124135A patent/US3821471A/en not_active Expired - Lifetime
1972
- 1972-01-28 CA CA133,379A patent/CA978860A/en not_active Expired
- 1972-02-23 GB GB841272A patent/GB1387874A/en not_active Expired
- 1972-02-28 DE DE2209424A patent/DE2209424C3/de not_active Expired
- 1972-03-09 NL NL7203169A patent/NL7203169A/xx not_active Application Discontinuation
- 1972-03-13 JP JP47024794A patent/JPS5110962B2/ja not_active Expired
- 1972-03-15 BE BE780711A patent/BE780711R/xx active
- 1972-03-15 FR FR7209093A patent/FR2130305B2/fr not_active Expired
- 1972-03-15 FR FR7209094A patent/FR2130306B2/fr not_active Expired
- 1972-03-15 BE BE780710A patent/BE780710R/xx active
1975
- 1975-07-21 JP JP8911275A patent/JPS5316281B2/ja not_active Expired

Also Published As

Publication number	Publication date
JPS5316281B2 (ja)	1978-05-31
FR2130305B2 (ja)	1979-04-27
DE2209424A1 (de)	1972-09-28
JPS4849401A (ja)	1973-07-12
BE780710R (fr)	1972-09-15
FR2130306A2 (ja)	1972-11-03
FR2130305A2 (ja)	1972-11-03
DE2209424C3 (de)	1978-09-28
JPS5136903A (ja)	1976-03-29
FR2130306B2 (ja)	1977-12-23
NL7203169A (ja)	1972-09-19
DE2209424B2 (de)	1978-01-26
JPS5110962B2 (ja)	1976-04-08
CA978860A (en)	1975-12-02
US3821471A (en)	1974-06-28
BE780711R (fr)	1972-09-15

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GB1387874A (en)	1975-03-19	Apparatus for recording and reproducing quadraphonic sound
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Legal Events

Date	Code	Title	Description
1975-07-30	PS	Patent sealed [section 19, patents act 1949]
1980-10-08	PCNP	Patent ceased through non-payment of renewal fee