GB1328142A - Audio systems - Google Patents

Audio systems

Info

Publication number
GB1328142A
GB1328142A GB4968870A GB4968870A GB1328142A GB 1328142 A GB1328142 A GB 1328142A GB 4968870 A GB4968870 A GB 4968870A GB 4968870 A GB4968870 A GB 4968870A GB 1328142 A GB1328142 A GB 1328142A
Authority
GB
United Kingdom
Prior art keywords
audio systems
aug
audio frequency
systems
quadrasonic
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
GB4968870A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB1328142A publication Critical patent/GB1328142A/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)
  • Theoretical Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Mathematical Analysis (AREA)
  • Mathematical Optimization (AREA)
  • Mathematical Physics (AREA)
  • Pure & Applied Mathematics (AREA)
  • Algebra (AREA)
  • General Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Stereophonic System (AREA)
  • Stereo-Broadcasting Methods (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)
  • Structure Of Receivers (AREA)

Abstract

1328142 Quadrasonic systems P SCHEIBER 28 Aug 1970 [28 Aug 1969 29 Dec 1969] 49688/72 Divided out of 1328141 Heading H4R All subject matter of this Specification is disclosed in the parent Specification 1,328,141. The claims relate to the decoder circuit for separating four audio frequency outputs from two audio frequency input channels.
GB4968870A 1969-08-28 1970-08-28 Audio systems Expired GB1328142A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US85382269A 1969-08-28 1969-08-28
US88844069A 1969-12-29 1969-12-29

Publications (1)

Publication Number Publication Date
GB1328142A true GB1328142A (en) 1973-08-30

Family

ID=27127190

Family Applications (2)

Application Number Title Priority Date Filing Date
GB4968870A Expired GB1328142A (en) 1969-08-28 1970-08-28 Audio systems
GB1389170A Expired GB1328141A (en) 1969-08-28 1970-08-28 Audio systems

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB1389170A Expired GB1328141A (en) 1969-08-28 1970-08-28 Audio systems

Country Status (2)

Country Link
JP (1) JPS5028162B1 (en)
GB (2) GB1328142A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4799260A (en) * 1985-03-07 1989-01-17 Dolby Laboratories Licensing Corporation Variable matrix decoder
US7251337B2 (en) 2003-04-24 2007-07-31 Dolby Laboratories Licensing Corporation Volume control in movie theaters
US7551745B2 (en) 2003-04-24 2009-06-23 Dolby Laboratories Licensing Corporation Volume and compression control in movie theaters

Also Published As

Publication number Publication date
GB1328141A (en) 1973-08-30
DE2014856B2 (en) 1976-11-11
JPS5028162B1 (en) 1975-09-12
DE2014856A1 (en) 1971-03-04

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees
427A Application made for restoration (sect. 27/1949)
427C Application for amendment of specification now open to opposition (sect. 27/1949)
427B Order made restoring the patent (sect. 27/1949)
PCNP Patent ceased through non-payment of renewal fee