GB1514411A - Colour television signal demodulator circuit - Google Patents

Colour television signal demodulator circuit

Info

Publication number
GB1514411A
GB1514411A GB183676A GB183676A GB1514411A GB 1514411 A GB1514411 A GB 1514411A GB 183676 A GB183676 A GB 183676A GB 183676 A GB183676 A GB 183676A GB 1514411 A GB1514411 A GB 1514411A
Authority
GB
United Kingdom
Prior art keywords
demodulators
phase
pair
pal
signal
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
GB183676A
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.)
Indesit Industria Elettrodomestici Italiana SpA
Original Assignee
Indesit Industria Elettrodomestici Italiana SpA
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 Indesit Industria Elettrodomestici Italiana SpA filed Critical Indesit Industria Elettrodomestici Italiana SpA
Publication of GB1514411A publication Critical patent/GB1514411A/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
    • H04N11/165—Decoding means therefor

Landscapes

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

Abstract

1514411 Colour television INDESIT INDUSTRIA ELETTRODOMESTICI ITALIANA SpA 16 Jan 1976 [17 Jan 1975] 01836/76 Heading H4F PAL chrominance signal demodulator comprises a PAL one-line-period-delay decoder 1, 2,3, 5, the R-Y chroma signal being fed to a pair of synchronous demodulators 6 and 7, Fig. 1, and the B-Y chroma signal to synchronous demodulators 8 and 9. With no phase error in the two phase quadrature subcarrier signals from subcarrier generator 11 (supplied by burst gate 4) which are fed to each pair of demodulators, the outputs of the demodulators of each pair are equal. If there is a phase error then the differences between the ouputs of the demodulators of each pair are used to control a phase displacement device 14 in the feedback loop of generator 11. The colour difference signals R-Y and B-Y are derived by adding 18 and 22 the outputs of each pair of demodulators. The phase error controlling signal is derived using peak detectors 20, 21, 24 and 25, adders 26 and 27 and differential amplifier 28. The circuit includes -45 degrees phase shifter 13, -90 degrees phase shifter 17, + 90 degrees phase shifter 15 and PAL switch 16. In a second embodiment, Fig. 2, two subcarrier generators 11 and 11<SP>1</SP> are used, the lower part of the circuit being substantially the same as the lower part of Fig. 1, and the operation of the upper part being the same as the lower part once the switched phase inverter (PAL switch) 16 has neutralized the periodic phase reversal of the signal R-Y.
GB183676A 1975-01-17 1976-01-16 Colour television signal demodulator circuit Expired GB1514411A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT6709375A IT1027306B (en) 1975-01-17 1975-01-17 DEMODULATOR CIRCUIT OF TELECISIVE CHROMATIC SIGNALS

Publications (1)

Publication Number Publication Date
GB1514411A true GB1514411A (en) 1978-06-14

Family

ID=11299506

Family Applications (1)

Application Number Title Priority Date Filing Date
GB183676A Expired GB1514411A (en) 1975-01-17 1976-01-16 Colour television signal demodulator circuit

Country Status (3)

Country Link
DE (1) DE2556847C2 (en)
GB (1) GB1514411A (en)
IT (1) IT1027306B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4223257C2 (en) * 1992-07-15 1994-07-14 Telefunken Microelectron Circuit arrangement for demodulating the SECAM color beard signal

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1276087B (en) * 1965-08-26 1968-08-29 Fernseh Gmbh Control circuit for correcting color saturation errors in a PAL decoder

Also Published As

Publication number Publication date
DE2556847C2 (en) 1984-11-29
DE2556847A1 (en) 1976-07-22
IT1027306B (en) 1978-11-20

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Legal Events

Date Code Title Description
PS Patent sealed
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee