GB1160862A - Improvements in or relating to Wired Broadcasting Systems - Google Patents

Improvements in or relating to Wired Broadcasting Systems

Info

Publication number
GB1160862A
GB1160862A GB2387966A GB2387966A GB1160862A GB 1160862 A GB1160862 A GB 1160862A GB 2387966 A GB2387966 A GB 2387966A GB 2387966 A GB2387966 A GB 2387966A GB 1160862 A GB1160862 A GB 1160862A
Authority
GB
United Kingdom
Prior art keywords
carrier wave
colour
information
line
brightness
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
GB2387966A
Inventor
Eric John Gargini
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.)
Communications Patents Ltd
Original Assignee
Communications Patents 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 Communications Patents Ltd filed Critical Communications Patents Ltd
Priority to GB2387966A priority Critical patent/GB1160862A/en
Priority to NL6707067A priority patent/NL6707067A/xx
Priority to DE19671512170 priority patent/DE1512170A1/en
Priority to CH721467A priority patent/CH482374A/en
Priority to ES340959A priority patent/ES340959A1/en
Priority to AT494167A priority patent/AT277338B/en
Priority to BE699046D priority patent/BE699046A/xx
Priority to SE747167A priority patent/SE325303B/xx
Priority to ES353939A priority patent/ES353939A1/en
Publication of GB1160862A publication Critical patent/GB1160862A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H04N11/14—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous signals only in which one signal, modulated in phase and amplitude, conveys colour information and a second signal conveys brightness information, e.g. NTSC-system
    • H04N11/16—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous signals only in which one signal, modulated in phase and amplitude, conveys colour information and a second signal conveys brightness information, e.g. NTSC-system the chrominance signal alternating in phase, e.g. PAL-system

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Color Television Systems (AREA)
  • Amplitude Modulation (AREA)
  • Processing Of Color Television Signals (AREA)

Abstract

1,160,862. Colour television; wired broadcasting. COMMUNICATIONS PATENTS Ltd. 19 May, 1967 [27 May, 1966], No. 23879/66. Headings H4F and H4R. A wired broadcasting system comprises a transmitting apparatus 1 which receives PAL type colour television signals radiated from a broadcasting transmitter and modifies them for transmission on conductive network 2, 3 to receivers 6 and 7. In the transmitter 1 the received signals are fed to device 16 which provides on line 17 brightness information and suppressed carrier wave colour carrier information in respect of first and second colour carrier information signals, the phase of the second colour carrier information signal being periodically reversed, on line 18 line scanning pulses, and on line 19 colour bursts. The bursts are fed to a comparator 20 and frequency control arrangement 24 to synchronize an oscillator 21 which generates a pilot carrier wave at the burst frequency. The frequency of the pilot carrier wave is doubled, 26, and phase inverted, 30, every line and the resulting oscillations are modulated, 32, by the brightness and colour carrier information on line 17. After passing through a vestigial sideband filter 34<SP>1</SP> and being added, 25, to the pilot carrier wave, the signal transmitted over conductors 2, 3 comprises a brightness information carrier component having a carrier wave 8, a suppressed carrier wave colour sub-carrier information component in respect of the first and second colour carrier information signals, having a suppressed sub-carrier wave 10, and a pilot carrier wave 12, the phase of the brightness and first colour information components being reversed at line frequency. The frequencies of the pilot carrier wave 12, the carrier wave 8 and the suppressed sub-carrier wave 10 are related in the ratio 1:2:3. In the receiver 6 the signals from conductors 2, 3 are fed to a bandpass filter 37 which selects the brightness and colour information components. These signals are amplified, 38, and demodulated by an envlope detector 39 to produce on line 40 a brightness information signal of video frequency. The suppressed carrier wave colour sub-carrier information signals are derived from the output of detector 39 by means of a band pass filter 41 and two synchronous detectors 42 and 43. The second colour information signal is obtained from detector 42 by means of a re-insertion carrier wave of constant phase derived from the pilot carrier wave by means of a narrow band pass filter 44 and amplifier 45. The first colour information signal is obtained from detector 43 by means of a reinsertion carrier wave the phase of which is reversed at line frequency derived from a balanced mixer 48 fed with the amplified pilot carrier wave and the brightness carrier wave, the phase of which is reversed at line frequency. The brightness carrier wave is derived from the output of amplifier 38 through a narrow band pass filter 49.
GB2387966A 1966-05-27 1966-05-27 Improvements in or relating to Wired Broadcasting Systems Expired GB1160862A (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
GB2387966A GB1160862A (en) 1966-05-27 1966-05-27 Improvements in or relating to Wired Broadcasting Systems
NL6707067A NL6707067A (en) 1966-05-27 1967-05-22
DE19671512170 DE1512170A1 (en) 1966-05-27 1967-05-23 Wire radio system for color television broadcasts
CH721467A CH482374A (en) 1966-05-27 1967-05-23 Wire radio system for color television
ES340959A ES340959A1 (en) 1966-05-27 1967-05-24 Improvements in or relating to Wired Broadcasting Systems
AT494167A AT277338B (en) 1966-05-27 1967-05-26 Wire radio system for color television broadcasts
BE699046D BE699046A (en) 1966-05-27 1967-05-26
SE747167A SE325303B (en) 1966-05-27 1967-05-26
ES353939A ES353939A1 (en) 1966-05-27 1968-05-16 Improvements in or relating to Wired Broadcasting Systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2387966A GB1160862A (en) 1966-05-27 1966-05-27 Improvements in or relating to Wired Broadcasting Systems

Publications (1)

Publication Number Publication Date
GB1160862A true GB1160862A (en) 1969-08-06

Family

ID=10202805

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2387966A Expired GB1160862A (en) 1966-05-27 1966-05-27 Improvements in or relating to Wired Broadcasting Systems

Country Status (8)

Country Link
AT (1) AT277338B (en)
BE (1) BE699046A (en)
CH (1) CH482374A (en)
DE (1) DE1512170A1 (en)
ES (2) ES340959A1 (en)
GB (1) GB1160862A (en)
NL (1) NL6707067A (en)
SE (1) SE325303B (en)

Also Published As

Publication number Publication date
DE1512170A1 (en) 1969-04-03
SE325303B (en) 1970-06-29
NL6707067A (en) 1967-11-28
BE699046A (en) 1967-11-03
AT277338B (en) 1969-12-29
ES340959A1 (en) 1968-09-16
CH482374A (en) 1969-11-30
ES353939A1 (en) 1969-10-16

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees