GB1476984A - System for cancelling time axis variation components in pal system colour television signals - Google Patents

System for cancelling time axis variation components in pal system colour television signals

Info

Publication number
GB1476984A
GB1476984A GB2569374A GB2569374A GB1476984A GB 1476984 A GB1476984 A GB 1476984A GB 2569374 A GB2569374 A GB 2569374A GB 2569374 A GB2569374 A GB 2569374A GB 1476984 A GB1476984 A GB 1476984A
Authority
GB
United Kingdom
Prior art keywords
frequency
frequency converter
signal
output
oscillator
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
GB2569374A
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to GB2569374A priority Critical patent/GB1476984A/en
Priority to NL7407901.A priority patent/NL163401C/en
Priority to AU70126/74A priority patent/AU464336B2/en
Priority to DE2428862A priority patent/DE2428862C3/en
Publication of GB1476984A publication Critical patent/GB1476984A/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
    • H04N9/455—Generation of colour burst signals; Insertion of colour burst signals in colour picture signals or separation of colour burst signals from colour picture signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/79—Processing of colour television signals in connection with recording
    • H04N9/80—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
    • H04N9/82—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only
    • H04N9/83—Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only the recorded chrominance signal occupying a frequency band under the frequency band of the recorded brightness signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/79—Processing of colour television signals in connection with recording
    • H04N9/87—Regeneration of colour television signals
    • H04N9/898—Regeneration of colour television signals using frequency multiplication of the reproduced colour signal carrier with another auxiliary reproduced signal, e.g. a pilot signal carrier

Landscapes

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

Abstract

1476984 Colour television MATSUSHITA ELECTRIC INDUSTRIAL CO Ltd 10 June 1974 25693/74 Heading H4F Timing errors in a PAL colour television signal are cancelled by using a variable frequency oscillator 20 controlled by a phase comparator 21 receiving, via respective frequency converters 16, 19, the colour synchronizing bursts in the received signal and the output of the oscillator 20, the output of frequency converter 19 being fed to a frequency converter 22 which also receives the chrominance component of the received signal and produces a chrominance signal free from timing errors; a phase modulator 28 receiving, via an integrator 27, the output of phase comparator 21 is included between frequency converters 19 and 22 or in the output of frequency converter 22 or in one of the inputs to frequency converter 19. The apparatus may be used in a colour television receiver or, as shown, in playback apparatus receiving a signal played back from a magnetic tape, the received colour subcarrier frequency being 767 kHz. Crystal oscillator 17 operates at 3À58 MHz to provide from frequency converter 16 and burst gate 18 colour synchronizing bursts at 4À3 MHz subject to timing errors. Variable frequency oscillator 20 has a centre frequency of 767 kHz to produce from frequency converter 19 a signal, at 4À34 MHz subject to the same timing errors as the received signal, which is used to produce from frequency converter 22 a chrominance component having a subcarrier frequency of 3À58 MHz free from timing errors. Variable frequency oscillator 20 is controlled by an AFC circuit 25 receiving the horizontal synchronizing signal separated from the output signal by a circuit 24. In an alternative embodiment circuit 25 is omitted and an additional frequency converter (32, Fig. 11, not shown) is included between variable frequency oscillator 20 and frequency converter 19, the additional frequency converter (32) receiving an output from a further variable frequency oscillator (31) controlled by a further phase comparator (29) receiving the separated horizontal synchronizing signal from 24 and, via a frequency divider (30), the output of the further variable frequency oscillator (31).
GB2569374A 1974-06-10 1974-06-10 System for cancelling time axis variation components in pal system colour television signals Expired GB1476984A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB2569374A GB1476984A (en) 1974-06-10 1974-06-10 System for cancelling time axis variation components in pal system colour television signals
NL7407901.A NL163401C (en) 1974-06-10 1974-06-13 MAGNETIC VIDEO REGISTRATION AND DISPLAY DEVICE, PROVIDED WITH ORGANS FOR OVERRIDE TIME VARIATIONS IN A SIGNAL ACCORDING TO THE PAL SYSTEM.
AU70126/74A AU464336B2 (en) 1974-06-10 1974-06-14 System for cancelling time axis variation components in pal system color television signals
DE2428862A DE2428862C3 (en) 1974-06-10 1974-06-14 System for eliminating time axis variation components in color television signals

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB2569374A GB1476984A (en) 1974-06-10 1974-06-10 System for cancelling time axis variation components in pal system colour television signals
NL7407901.A NL163401C (en) 1974-06-10 1974-06-13 MAGNETIC VIDEO REGISTRATION AND DISPLAY DEVICE, PROVIDED WITH ORGANS FOR OVERRIDE TIME VARIATIONS IN A SIGNAL ACCORDING TO THE PAL SYSTEM.
AU70126/74A AU464336B2 (en) 1974-06-10 1974-06-14 System for cancelling time axis variation components in pal system color television signals
DE2428862A DE2428862C3 (en) 1974-06-10 1974-06-14 System for eliminating time axis variation components in color television signals

Publications (1)

Publication Number Publication Date
GB1476984A true GB1476984A (en) 1977-06-16

Family

ID=27423738

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2569374A Expired GB1476984A (en) 1974-06-10 1974-06-10 System for cancelling time axis variation components in pal system colour television signals

Country Status (4)

Country Link
AU (1) AU464336B2 (en)
DE (1) DE2428862C3 (en)
GB (1) GB1476984A (en)
NL (1) NL163401C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0546440A1 (en) * 1991-12-10 1993-06-16 Kabushiki Kaisha Toshiba Automatic phase controlling circuit for processing reproduced chroma signal

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2736199C2 (en) * 1977-08-11 1982-10-21 Robert Bosch Gmbh, 7000 Stuttgart Method and circuit arrangement for compensating for phase errors
JPS57124987A (en) * 1981-01-26 1982-08-04 Matsushita Electric Ind Co Ltd Processor for pal color video signal

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2979558A (en) * 1957-10-02 1961-04-11 Rca Corp Recording and reproducing system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0546440A1 (en) * 1991-12-10 1993-06-16 Kabushiki Kaisha Toshiba Automatic phase controlling circuit for processing reproduced chroma signal
US5339112A (en) * 1991-12-10 1994-08-16 Kabushiki Kaisha Toshiba Automatic phase controlling circuit for processing reproduced chroma signals

Also Published As

Publication number Publication date
AU464336B2 (en) 1975-08-06
NL163401C (en) 1980-08-15
DE2428862B2 (en) 1976-10-14
NL163401B (en) 1980-03-17
DE2428862A1 (en) 1976-01-02
AU7012674A (en) 1975-08-21
NL7407901A (en) 1975-12-16
DE2428862C3 (en) 1982-12-02

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee