CA978860A - Apparatus for recording and reproducing quadruphonic sound - Google Patents

Apparatus for recording and reproducing quadruphonic sound

Info

Publication number: CA978860A
Authority: CA; Canada
Prior art keywords: quadruphonic; reproducing; sound; recording; reproducing quadruphonic
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

CA133,379A

Other versions

CA133379S (en

Inventor

Benjamin B. Bauer

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

1972-01-28

Publication date

1975-12-02

1972-01-28 Application filed by CBS Inc filed Critical CBS Inc

1975-12-02 Application granted granted Critical

1975-12-02 Publication of CA978860A publication Critical patent/CA978860A/en

Status 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)
Mathematical Physics (AREA)
General Physics & Mathematics (AREA)
Mathematical Analysis (AREA)
Mathematical Optimization (AREA)
Algebra (AREA)
Pure & Applied Mathematics (AREA)
Theoretical Computer Science (AREA)
Acoustics & Sound (AREA)
Signal Processing (AREA)
Stereophonic System (AREA)
Stereo-Broadcasting Methods (AREA)
Compression, Expansion, Code Conversion, And Decoders (AREA)
Magnetic Bearings And Hydrostatic Bearings (AREA)

CA133,379A 1971-03-15 1972-01-28 Apparatus for recording and reproducing quadruphonic sound Expired CA978860A (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
CA978860A true CA978860A (en)	1975-12-02

Family

ID=22412987

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
CA133,379A Expired CA978860A (en)	1971-03-15	1972-01-28	Apparatus for recording and reproducing quadruphonic sound

Country Status (8)

Country	Link
US (1)	US3821471A (en)
JP (2)	JPS5110962B2 (en)
BE (2)	BE780710R (en)
CA (1)	CA978860A (en)
DE (1)	DE2209424C3 (en)
FR (2)	FR2130305B2 (en)
GB (1)	GB1387874A (en)
NL (1)	NL7203169A (en)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
JPS5645358B2 (en) *	1973-11-29	1981-10-26
JPS5424841B2 (en) *	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 (en) *	1977-11-24	1983-06-10	株式会社日立製作所	stationary induction equipment
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
JP5092400B2 (en) *	2004-06-28	2012-12-05	味の素株式会社	Nutritional composition and composition for preventing or improving digestive tract function deterioration
JP4835298B2 (en) *	2006-07-21	2011-12-14	ソニー株式会社	Audio signal processing apparatus, audio signal processing method and program
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/en 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 FR FR7209093A patent/FR2130305B2/fr not_active Expired
- 1972-03-15 BE BE780710A patent/BE780710R/en active
- 1972-03-15 BE BE780711A patent/BE780711R/en active
- 1972-03-15 FR FR7209094A patent/FR2130306B2/fr not_active Expired
1975
- 1975-07-21 JP JP8911275A patent/JPS5316281B2/ja not_active Expired

Also Published As

Publication number	Publication date
BE780711R (en)	1972-09-15
JPS5110962B2 (en)	1976-04-08
BE780710R (en)	1972-09-15
FR2130305A2 (en)	1972-11-03
FR2130305B2 (en)	1979-04-27
JPS5316281B2 (en)	1978-05-31
GB1387874A (en)	1975-03-19
US3821471A (en)	1974-06-28
JPS4849401A (en)	1973-07-12
JPS5136903A (en)	1976-03-29
FR2130306B2 (en)	1977-12-23
DE2209424A1 (en)	1972-09-28
DE2209424C3 (en)	1978-09-28
FR2130306A2 (en)	1972-11-03
NL7203169A (en)	1972-09-19
DE2209424B2 (en)	1978-01-26

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Legal Events

Date	Code	Title	Description
2022-09-10	MKEX	Expiry	Effective date: 19921202