GB1459188A - Apparatus for producing pseudo quadraphonic signals from stereo signals - Google Patents

Apparatus for producing pseudo quadraphonic signals from stereo signals

Info

Publication number
GB1459188A
GB1459188A GB188873A GB188873A GB1459188A GB 1459188 A GB1459188 A GB 1459188A GB 188873 A GB188873 A GB 188873A GB 188873 A GB188873 A GB 188873A GB 1459188 A GB1459188 A GB 1459188A
Authority
GB
United Kingdom
Prior art keywords
signals
quadraphonic
producing pseudo
stereo
channel
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
GB188873A
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.)
EMI Ltd
Original Assignee
EMI Ltd
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 EMI Ltd filed Critical EMI Ltd
Priority to GB188873A priority Critical patent/GB1459188A/en
Publication of GB1459188A publication Critical patent/GB1459188A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S5/00—Pseudo-stereo systems, e.g. in which additional channel signals are derived from monophonic signals by means of phase shifting, time delay or reverberation 
    • H04S5/02—Pseudo-stereo systems, e.g. in which additional channel signals are derived from monophonic signals by means of phase shifting, time delay or reverberation  of the pseudo four-channel type, e.g. in which rear channel signals are derived from two-channel stereo signals

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Recording Or Reproducing By Magnetic Means (AREA)

Abstract

1459188 Quadraphonic synthesizers EMI Ltd 27 Feb 1974 [13 Jan 1973] 1888/73 Heading H4R Additional (rear) signals 14, 15 are synthesized from a two-channel stereophonic source 1, 2 by adding 11, 12 a reverberation signal derived from the sum 3 of the input channels to difference signals 5, 7 of one channel and a portion 4, 6 of the other. Rear signals of the form and are thereby produced in which usually γ and # are equal and lie between 0 and 1. Delays 8, 10 of 25 msec. and filter networks are optional. The arrangement may be in domestic equipment or in a recording studio to synthesize the rear channels before conventional encoding.
GB188873A 1973-01-13 1973-01-13 Apparatus for producing pseudo quadraphonic signals from stereo signals Expired GB1459188A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB188873A GB1459188A (en) 1973-01-13 1973-01-13 Apparatus for producing pseudo quadraphonic signals from stereo signals

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB188873A GB1459188A (en) 1973-01-13 1973-01-13 Apparatus for producing pseudo quadraphonic signals from stereo signals

Publications (1)

Publication Number Publication Date
GB1459188A true GB1459188A (en) 1976-12-22

Family

ID=9729823

Family Applications (1)

Application Number Title Priority Date Filing Date
GB188873A Expired GB1459188A (en) 1973-01-13 1973-01-13 Apparatus for producing pseudo quadraphonic signals from stereo signals

Country Status (1)

Country Link
GB (1) GB1459188A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2118808A (en) * 1982-04-20 1983-11-02 Neutrik Ag Stereophonic sound reproduction in motor vehicles
GB2122459A (en) * 1982-05-28 1984-01-11 Polk Audio Inc Method and apparatus for reproducing sound having a realistic ambient field and acoustic image
US4910779A (en) * 1987-10-15 1990-03-20 Cooper Duane H Head diffraction compensated stereo system with optimal equalization
WO1990007252A1 (en) * 1988-12-20 1990-06-28 Cannavo Raymond C Stereo sound system
US4975954A (en) * 1987-10-15 1990-12-04 Cooper Duane H Head diffraction compensated stereo system with optimal equalization
US5034983A (en) * 1987-10-15 1991-07-23 Cooper Duane H Head diffraction compensated stereo system
US5136651A (en) * 1987-10-15 1992-08-04 Cooper Duane H Head diffraction compensated stereo system
US5594800A (en) * 1991-02-15 1997-01-14 Trifield Productions Limited Sound reproduction system having a matrix converter

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2118808A (en) * 1982-04-20 1983-11-02 Neutrik Ag Stereophonic sound reproduction in motor vehicles
GB2122459A (en) * 1982-05-28 1984-01-11 Polk Audio Inc Method and apparatus for reproducing sound having a realistic ambient field and acoustic image
US4489432A (en) * 1982-05-28 1984-12-18 Polk Audio, Inc. Method and apparatus for reproducing sound having a realistic ambient field and acoustic image
US4910779A (en) * 1987-10-15 1990-03-20 Cooper Duane H Head diffraction compensated stereo system with optimal equalization
US4975954A (en) * 1987-10-15 1990-12-04 Cooper Duane H Head diffraction compensated stereo system with optimal equalization
US5034983A (en) * 1987-10-15 1991-07-23 Cooper Duane H Head diffraction compensated stereo system
US5136651A (en) * 1987-10-15 1992-08-04 Cooper Duane H Head diffraction compensated stereo system
WO1990007252A1 (en) * 1988-12-20 1990-06-28 Cannavo Raymond C Stereo sound system
US5594800A (en) * 1991-02-15 1997-01-14 Trifield Productions Limited Sound reproduction system having a matrix converter

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Legal Events

Date Code Title Description
PS Patent sealed
435 Patent endorsed 'licences of right' on the date specified (sect. 35/1949)
PCNP Patent ceased through non-payment of renewal fee