GB1414260A - Process and apparatus for quadraphonic transmission - Google Patents

Process and apparatus for quadraphonic transmission

Info

Publication number
GB1414260A
GB1414260A GB784873A GB784873A GB1414260A GB 1414260 A GB1414260 A GB 1414260A GB 784873 A GB784873 A GB 784873A GB 784873 A GB784873 A GB 784873A GB 1414260 A GB1414260 A GB 1414260A
Authority
GB
United Kingdom
Prior art keywords
signals
khz
transmission
microphones
turns
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
GB784873A
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.)
ELEKTROMECHANIKAI VALLALAT
Original Assignee
ELEKTROMECHANIKAI VALLALAT
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 ELEKTROMECHANIKAI VALLALAT filed Critical ELEKTROMECHANIKAI VALLALAT
Publication of GB1414260A publication Critical patent/GB1414260A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/86—Arrangements characterised by the broadcast information itself
    • H04H20/88—Stereophonic broadcast systems
    • H04H20/89—Stereophonic broadcast systems using three or more audio channels, e.g. triphonic or quadraphonic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems

Abstract

1414260 Quadraphonic transmission ELEKTROMEOHANIKAI VALLALAT 16 Feb 1973 [28 Dec 1972] 7848/73 Heading H4L Signals 1, 2, 3, 4 from a rectangular array of microphones 1-4 are coded and transmitted (for example, in frequency multiplex) to four loudspeakers 8, 9, 10, 11 respectively receiving them as double signals 1+2, 2+3, 3+4 and 4+1. The rectangular array of speakers is turned through 45 degrees relative to the microphone array in order to reproduce from virtual sources 12, 13, 14, 15 a sound pattern which is identical to, and has the same orientation as, that sensed by the microphones. A coder 5 turns the four microphone signals into three composite signals, the first being a sum of all four (1+2+3+4), the second and third being the diagonal differences (1-3, 2-4). A main channel of 30 Hz to 15 kHz (1, Fig. 2, not shown) carries the sum signal, and quadrature subcarriers (4) centred on 38 kHz carry the other two signals. Pilots at 19 kHz and 38 kHz are included, the latter to operate stereoquadraphonic mode switching circuits at the receiver. The transmission link 6 is radio or line. The decoder 7 turns the three composite signals into the four loud-speaker signals in an unspecified manner.
GB784873A 1972-12-28 1973-02-16 Process and apparatus for quadraphonic transmission Expired GB1414260A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
HUEE002080 HU165189B (en) 1972-12-28 1972-12-28

Publications (1)

Publication Number Publication Date
GB1414260A true GB1414260A (en) 1975-11-19

Family

ID=10995470

Family Applications (1)

Application Number Title Priority Date Filing Date
GB784873A Expired GB1414260A (en) 1972-12-28 1973-02-16 Process and apparatus for quadraphonic transmission

Country Status (8)

Country Link
JP (1) JPS4998601A (en)
AT (1) AT335515B (en)
CS (1) CS177118B2 (en)
DE (1) DE2307418A1 (en)
FR (1) FR2212717A1 (en)
GB (1) GB1414260A (en)
HU (1) HU165189B (en)
IT (1) IT1009023B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2310672A1 (en) * 1975-05-07 1976-12-03 Emv Elektromechanikai Vallalat Quadrphonic sound equipment using dual composite signals - has four loudspeakers receiving dual compositie signals to produce phantom sound sources

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1377138A (en) * 1971-04-15 1974-12-11 Matsushita Electric Ind Co Ltd Four channel arrangements
US3830978A (en) * 1971-07-08 1974-08-20 Matsushita Electric Ind Co Ltd Circuit for mixing four audio input signals to produce four audio output signals

Also Published As

Publication number Publication date
CS177118B2 (en) 1977-07-29
AT335515B (en) 1977-03-10
DE2307418A1 (en) 1974-07-11
ATA138273A (en) 1976-07-15
JPS4998601A (en) 1974-09-18
FR2212717A1 (en) 1974-07-26
HU165189B (en) 1974-07-27
IT1009023B (en) 1976-12-10

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee