GB813096A - Improvements in or relating to television and like signalling systems and signal transmitters - Google Patents

Improvements in or relating to television and like signalling systems and signal transmitters

Info

Publication number
GB813096A
GB813096A GB8461/57A GB846157A GB813096A GB 813096 A GB813096 A GB 813096A GB 8461/57 A GB8461/57 A GB 8461/57A GB 846157 A GB846157 A GB 846157A GB 813096 A GB813096 A GB 813096A
Authority
GB
United Kingdom
Prior art keywords
signals
correcting
television
carrier
information signals
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
GB8461/57A
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.)
Philips Electrical Industries Ltd
Original Assignee
Philips Electrical Industries 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 Philips Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB813096A publication Critical patent/GB813096A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/04—Systems for the transmission of one television signal, i.e. both picture and sound, by a single carrier
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/68—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for wholly or partially suppressing the carrier or one side band
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B14/00—Transmission systems not characterised by the medium used for transmission
    • H04B14/08—Transmission systems not characterised by the medium used for transmission characterised by the use of a sub-carrier
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/32—Reducing cross-talk, e.g. by compensating
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems
    • H04J1/02—Details
    • H04J1/12—Arrangements for reducing cross-talk between channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J7/00—Multiplex systems in which the amplitudes or durations of the signals in individual channels are characteristic of those channels
    • H04J7/02—Multiplex systems in which the amplitudes or durations of the signals in individual channels are characteristic of those channels in which the polarity of the amplitude is characteristic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N11/00—Colour television systems
    • H04N11/06—Transmission systems characterised by the manner in which the individual colour picture signal components are combined
    • H04N11/12—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous signals only

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Multimedia (AREA)
  • Color Television Systems (AREA)
  • Processing Of Color Television Signals (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

813,096. Multiplex radio signalling. PHILLIPS ELECTRICAL INDUSTRIES Ltd. March 14, 1957.[March 14, 1956], No. 8461/57. Class 40 (5). In an electric signalling system of the type in which two television or like information signals are transmitted simultaneously but independently as modulation of a sub-carrier which modulates a main radio-frequency carrier and the information signals are added before modulation is effected, to correcting signals for the purpose of reducing the effect of cross-talk, the correcting signals are the same for each of the information signals, and are proportional to the product of the information signals. The system is similar to that described in Specification 776,989, but it is shown that a close approximation to the desired correction, with a simplification of the apparatus, is obtained with correcting signals satisfying the above conditions. Provision may also be made for gamma correction in a television transmitting system. In the embodiment described, signals f 1 ,f 2 originating from two television cameras are first applied to two units 10 and 11 respectively which operate as gamma correctors and supply signals f 1 1/γ and f 2 <SP>1</SP>/γ to a unit 12 having an output proportional to the product of the incoming signals amplified by a suitable factor K to provide the correcting signal. The correcting signals are applied to mixers 13, 14 which also receive inputs from the units 10, 11 respectively and provide outputs # 1 = f 1 <SP>1</SP>/γ + Kf 1 <SP>1</SP>/γf 2 <SP>1</SP>/γ and # 2 =f 2 <SP>1</SP>/γ+ Kf 1 <SP>1</SP>/γ f 2 <SP>1</SP>/γ. These signals are applied to modulators 15, 16 and multiplied by phase-displaced functions g 1 = 1 + 2 cos # o t and g 2 = 1 - 2 cos # o t, where # 0 is the angular frequency of the sub-carrier, as described in Specification 776,989. The outputs of modulators 15, 16 are combined at 17 and applied via a filter 18 to a modulator to modulate the main carrier.
GB8461/57A 1956-03-14 1957-03-14 Improvements in or relating to television and like signalling systems and signal transmitters Expired GB813096A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1031345X 1956-03-14

Publications (1)

Publication Number Publication Date
GB813096A true GB813096A (en) 1959-05-06

Family

ID=9583103

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8461/57A Expired GB813096A (en) 1956-03-14 1957-03-14 Improvements in or relating to television and like signalling systems and signal transmitters

Country Status (5)

Country Link
BE (1) BE556064A (en)
DE (1) DE1031345B (en)
FR (1) FR1145794A (en)
GB (1) GB813096A (en)
NL (1) NL215310A (en)

Also Published As

Publication number Publication date
DE1031345B (en) 1958-06-04
NL215310A (en)
FR1145794A (en) 1957-10-29
BE556064A (en)

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