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GB1076735A - Improvements in or relating to decoder circuit arrangements for colour television receivers - Google Patents

Improvements in or relating to decoder circuit arrangements for colour television receivers

Info

Publication number
GB1076735A
GB1076735A GB1625165A GB1625165A GB1076735A GB 1076735 A GB1076735 A GB 1076735A GB 1625165 A GB1625165 A GB 1625165A GB 1625165 A GB1625165 A GB 1625165A GB 1076735 A GB1076735 A GB 1076735A
Authority
GB
United Kingdom
Prior art keywords
inverter
phase
demodulator
polarity
gate
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
GB1625165A
Inventor
Kenneth George Freeman
Richard Norman Jackson
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 Components Ltd
Original Assignee
Mullard 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 Mullard Ltd filed Critical Mullard Ltd
Priority to GB1625165A priority Critical patent/GB1076735A/en
Priority to CH526166A priority patent/CH462237A/en
Priority to NO16254066A priority patent/NO116673B/no
Priority to AT344266A priority patent/AT264613B/en
Priority to SE496766A priority patent/SE323102B/xx
Priority to NL6604891A priority patent/NL151236B/en
Priority to BE679474D priority patent/BE679474A/xx
Priority to DE19661462826 priority patent/DE1462826C3/en
Priority to FR57570A priority patent/FR1476119A/en
Publication of GB1076735A publication Critical patent/GB1076735A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/44—Colour synchronisation
    • H04N9/465—Synchronisation of the PAL-switch
    • 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
    • H04N11/165—Decoding means therefor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/44—Colour synchronisation

Landscapes

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

Abstract

1,076,735. Colour television. MULLARD Ltd. Feb. 8, 1966 [April 15, 1965], No. 16251/65. Heading H4F. PAL colour television signals, in which the subcarrier reference " burst " not only provides synchronizing information for the receiver reference oscillator but also alternates in phase about the - Q axis as illustrated in Figs. 1 (a) and 1 (b) for the purpose of signalling the line sequential phase reversal of the I modulation axis, are demodulated by an arrangement as shown in Fig. 2, comprising I and Q synchronous demodulators 3, 4 and a reference oscillator 1 which is established at the mean (- Q) phase of the alternating "bursts" applied through gate 2 and supplies a Q reference output to demodulator 4 and a I reference output to demodulator 3 via a switched inverter operating a line frequency, the arrangement being characterized by the provision of a second gate 7 which applies the output of demodulator during the " burst " to establish the line sequential operation of inverter 5 in the correct phase. In an alternative arrangement (not illustrated in detail) a third synchronous demodulator operating with the reference output from inverter 5 is used to provide the " burst " signal via gate 7 to the inverter. The signal via gate 7 is of the same polarity for successive " bursts " due to the line sequential phase inversion of the I reference signal, but changes in polarity should the phase of the line sequential operation of inverter 5 become incorrect. A polarity responsive device, such as a rectifier diode, is utilized to detect the signal polarity and apply a correction to the inverter. The inverter may comprise a diode switch controlled by a multivibrator driven by line frequency synchronizing pulses, the signal from gate 7, in the event of incorrect polarity, being applied to temporarily alter the multivibrator cycling time so as to reestablish operation in the correct phase. Reference is made to arrangements for use where the quadrature modulation axes are other than I and Q, e.g. R-Y, and B-Y. The invention may be applied to the demodulator described in Specification 1,005,290.
GB1625165A 1965-04-15 1965-04-15 Improvements in or relating to decoder circuit arrangements for colour television receivers Expired GB1076735A (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
GB1625165A GB1076735A (en) 1965-04-15 1965-04-15 Improvements in or relating to decoder circuit arrangements for colour television receivers
CH526166A CH462237A (en) 1965-04-15 1966-04-12 Decoding circuit for color television receivers
NO16254066A NO116673B (en) 1965-04-15 1966-04-12
AT344266A AT264613B (en) 1965-04-15 1966-04-12 Decoding circuit for color television receivers
SE496766A SE323102B (en) 1965-04-15 1966-04-12
NL6604891A NL151236B (en) 1965-04-15 1966-04-13 DECODING SWITCH FOR A COLOR TV RECEIVER.
BE679474D BE679474A (en) 1965-04-15 1966-04-13
DE19661462826 DE1462826C3 (en) 1965-04-15 1966-04-14 Decoder circuit with PAL identification
FR57570A FR1476119A (en) 1965-04-15 1966-04-14 Decoder circuit for a color television receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1625165A GB1076735A (en) 1965-04-15 1965-04-15 Improvements in or relating to decoder circuit arrangements for colour television receivers

Publications (1)

Publication Number Publication Date
GB1076735A true GB1076735A (en) 1967-07-19

Family

ID=10073945

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1625165A Expired GB1076735A (en) 1965-04-15 1965-04-15 Improvements in or relating to decoder circuit arrangements for colour television receivers

Country Status (8)

Country Link
AT (1) AT264613B (en)
BE (1) BE679474A (en)
CH (1) CH462237A (en)
DE (1) DE1462826C3 (en)
GB (1) GB1076735A (en)
NL (1) NL151236B (en)
NO (1) NO116673B (en)
SE (1) SE323102B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2841891A1 (en) * 1977-09-26 1979-03-29 Rca Corp ARRANGEMENT FOR CONTROLLING THE ON-LINE SWITCHING OF COLOR TELEVISION DECODERS

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2841891A1 (en) * 1977-09-26 1979-03-29 Rca Corp ARRANGEMENT FOR CONTROLLING THE ON-LINE SWITCHING OF COLOR TELEVISION DECODERS

Also Published As

Publication number Publication date
NL6604891A (en) 1966-10-17
NO116673B (en) 1969-05-05
DE1462826A1 (en) 1968-12-19
BE679474A (en) 1966-10-13
SE323102B (en) 1970-04-27
NL151236B (en) 1976-10-15
CH462237A (en) 1968-09-15
AT264613B (en) 1968-09-10
DE1462826C3 (en) 1975-11-13
DE1462826B2 (en) 1975-04-03

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