GB1015179A - Improvements in or relating to colour television standards changing apparatus - Google Patents

Improvements in or relating to colour television standards changing apparatus

Info

Publication number
GB1015179A
GB1015179A GB136964A GB136964A GB1015179A GB 1015179 A GB1015179 A GB 1015179A GB 136964 A GB136964 A GB 136964A GB 136964 A GB136964 A GB 136964A GB 1015179 A GB1015179 A GB 1015179A
Authority
GB
United Kingdom
Prior art keywords
combining circuit
colour
signal
phase shifter
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
GB136964A
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.)
Telefunken Patentverwertungs GmbH
Original Assignee
Telefunken Patentverwertungs GmbH
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 Telefunken Patentverwertungs GmbH filed Critical Telefunken Patentverwertungs GmbH
Publication of GB1015179A publication Critical patent/GB1015179A/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
    • H04N11/20—Conversion of the manner in which the individual colour picture signal components are combined, e.g. conversion of colour television standards

Landscapes

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

Abstract

1,015,179. Colour television. TELEFUNKEN PATENTVERWERTUNGSGESELLSCHAFT. Jan. 13, 1964 [Feb. 28, 1963], No. 1369/64. Heading H4F. A colour television standards changer for transforming colour television signals according to the modified NTSC system (PAL system), in which one of the two colour quadrature modulated subcarrier vectors (Q<SP>1</SP> or I<SP>1</SP>) is periodically reversed in phase at line frequency, into signals according to the normal NTSC system, comprises means for feeding the complete video signal to a filter 2 which rejects the colour subcarrier and passes the brightness signal (2y<SP>1</SP>) to combining circuit 4; means for feeding the complete video signal to a filter 6 which selects and passes the colour subcarrier and its sidebands (a) through a 180 degrees phase shifter to combining circuit 8, (b) directly to combining circuit 11, (c) through a line duration delay circuit and adjustable phase shifter 10 to combining circuits 8 and 11, the output from combining circuit 11 (2Q<SP>1</SP>) being fed to combining circuit 4 and the output from combining circuit 8 (2I<SP>1</SP> or - 2I<SP>1</SP>) being fed directly or through a 180 degrees phase shifter 15 to combining circuit 4, the transformed signals being taken off along line 16. The output from stage 8 yields the signals 2I<SP>1</SP> and - 2I1 alternately, I<SP>1</SP> being the colour subcarrier vector (difference signal) which is periodically reversed through 180 degrees in the PAL system, and by means of the 180 degrees phase shifter 15 and switch 14 the signal supplied to stage 4 is + 2I<SP>1</SP>. The signals + 2I<SP>1</SP>, + 2Q<SP>1</SP> and 2y<SP>1</SP> thus form the normal NTSC signal in combining circuit 4. A normal NTSC signal may pass without obstruction through the standards changer.
GB136964A 1963-02-28 1964-01-13 Improvements in or relating to colour television standards changing apparatus Expired GB1015179A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DET23536A DE1167883B (en) 1963-02-28 1963-02-28 Color television standards converter

Publications (1)

Publication Number Publication Date
GB1015179A true GB1015179A (en) 1965-12-31

Family

ID=7551031

Family Applications (1)

Application Number Title Priority Date Filing Date
GB136964A Expired GB1015179A (en) 1963-02-28 1964-01-13 Improvements in or relating to colour television standards changing apparatus

Country Status (2)

Country Link
DE (1) DE1167883B (en)
GB (1) GB1015179A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4374396A (en) * 1979-04-26 1983-02-15 Robert Bosch Gmbh Chrominance sub-carrier modifier for PAL-color television signals
GB2123241A (en) * 1982-06-25 1984-01-25 S P T Video Limited Improvements in or relating to colour television colour decoders

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CS182761B2 (en) * 1969-09-18 1978-05-31 Yasuharu Kubota Colour television camera

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4374396A (en) * 1979-04-26 1983-02-15 Robert Bosch Gmbh Chrominance sub-carrier modifier for PAL-color television signals
GB2123241A (en) * 1982-06-25 1984-01-25 S P T Video Limited Improvements in or relating to colour television colour decoders

Also Published As

Publication number Publication date
DE1167883B (en) 1964-04-16

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