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

Apparatus for recording and reproducing quadraphonic sound

Info

Publication number
GB1387874A
GB1387874A GB841272A GB841272A GB1387874A GB 1387874 A GB1387874 A GB 1387874A GB 841272 A GB841272 A GB 841272A GB 841272 A GB841272 A GB 841272A GB 1387874 A GB1387874 A GB 1387874A
Authority
GB
United Kingdom
Prior art keywords
channel
signals
phase shift
signal
centre
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
GB841272A
Other languages
English (en)
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 GB1387874A publication Critical patent/GB1387874A/en
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)
  • Stereo-Broadcasting Methods (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Magnetic Bearings And Hydrostatic Bearings (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 (enrdf_load_stackoverflow)
JP (2) JPS5110962B2 (enrdf_load_stackoverflow)
BE (2) BE780711R (enrdf_load_stackoverflow)
CA (1) CA978860A (enrdf_load_stackoverflow)
DE (1) DE2209424C3 (enrdf_load_stackoverflow)
FR (2) FR2130305B2 (enrdf_load_stackoverflow)
GB (1) GB1387874A (enrdf_load_stackoverflow)
NL (1) NL7203169A (enrdf_load_stackoverflow)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5645358B2 (enrdf_load_stackoverflow) * 1973-11-29 1981-10-26
JPS5424841B2 (enrdf_load_stackoverflow) * 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
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
US4941177A (en) * 1985-03-07 1990-07-10 Dolby Laboratories Licensing Corporation Variable matrix decoder
US7251337B2 (en) * 2003-04-24 2007-07-31 Dolby Laboratories Licensing Corporation Volume control in movie theaters
WO2006001492A1 (ja) * 2004-06-28 2006-01-05 Ajinomoto Co., Inc. 栄養組成物および消化管機能低下予防・改善用組成物
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

Also Published As

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

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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