FR2453573A1 - METHOD FOR ADJUSTING THE GAIN OF A USEFUL CHROMINANCE CHANNEL IN SECAM ENCODERS AND DEVICE FOR USING THE METHOD - Google Patents

METHOD FOR ADJUSTING THE GAIN OF A USEFUL CHROMINANCE CHANNEL IN SECAM ENCODERS AND DEVICE FOR USING THE METHOD

Info

Publication number
FR2453573A1
FR2453573A1 FR8007750A FR8007750A FR2453573A1 FR 2453573 A1 FR2453573 A1 FR 2453573A1 FR 8007750 A FR8007750 A FR 8007750A FR 8007750 A FR8007750 A FR 8007750A FR 2453573 A1 FR2453573 A1 FR 2453573A1
Authority
FR
France
Prior art keywords
gain
adjusting
useful
chrominance channel
secam
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.)
Granted
Application number
FR8007750A
Other languages
French (fr)
Other versions
FR2453573B1 (en
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.)
RCA Corp
Original Assignee
RCA Corp
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
Priority claimed from US06/094,279 external-priority patent/US4264918A/en
Application filed by RCA Corp filed Critical RCA Corp
Publication of FR2453573A1 publication Critical patent/FR2453573A1/en
Application granted granted Critical
Publication of FR2453573B1 publication Critical patent/FR2453573B1/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
    • H04N11/18—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous and sequential signals, e.g. SECAM-system
    • H04N11/183—Encoding means therefor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals
    • H04N9/68—Circuits for processing colour signals for controlling the amplitude of colour signals, e.g. automatic chroma control circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Processing Of Color Television Signals (AREA)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
  • Color Television Systems (AREA)

Abstract

La présente invention concerne un dispositif pour régler le gain d un canal de chrominance SECAM ayant un modulateur de fréquence. Selon l'invention, on prévoit un moyen 58, 60, 68 pour insérer un signal de test dans le canal, un moyen 62, 64, 66 pour mesurer la déviation de fréquence résultante due à ce signal de test, et un moyen 74 pour régler le gain du canal selon la déviation résultante. L'invention s'applique notamment aux téléviseurs en couleurs SECAM.The present invention relates to a device for adjusting the gain of a SECAM chrominance channel having a frequency modulator. According to the invention, there is provided a means 58, 60, 68 for inserting a test signal into the channel, a means 62, 64, 66 for measuring the resulting frequency deviation due to this test signal, and a means 74 for adjust the gain of the channel according to the resulting deviation. The invention applies in particular to SECAM color televisions.

FR8007750A 1979-04-05 1980-04-04 METHOD FOR ADJUSTING THE GAIN OF A USEFUL CHROMINANCE CHANNEL IN SECAM ENCODERS AND DEVICE FOR USING THE METHOD Expired FR2453573B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB7912024 1979-04-05
US06/094,279 US4264918A (en) 1979-04-05 1979-11-19 Automatic chroma gain control circuits useful in secam coders

Publications (2)

Publication Number Publication Date
FR2453573A1 true FR2453573A1 (en) 1980-10-31
FR2453573B1 FR2453573B1 (en) 1986-05-02

Family

ID=26271138

Family Applications (1)

Application Number Title Priority Date Filing Date
FR8007750A Expired FR2453573B1 (en) 1979-04-05 1980-04-04 METHOD FOR ADJUSTING THE GAIN OF A USEFUL CHROMINANCE CHANNEL IN SECAM ENCODERS AND DEVICE FOR USING THE METHOD

Country Status (3)

Country Link
DE (1) DE3013195C2 (en)
FR (1) FR2453573B1 (en)
GB (1) GB2050105B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4528527A (en) * 1982-03-08 1985-07-09 Rca Corporation SECAM Modulator

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2283611A1 (en) * 1974-08-30 1976-03-26 Thomson Csf DEVICE FOR CONTROLLING THE REST FREQUENCY OF A COLOR TELEVISION SUB-CARRIER AND CORRESPONDING ENCODERS FOR THE SECAM SYSTEM
DE2935582A1 (en) * 1978-09-02 1980-03-06 Marconi Instruments Ltd METHOD FOR GENERATING A FREQUENCY-MODULATED SIGNAL AND SIGNAL GENERATOR FOR THIS METHOD

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2446539A1 (en) * 1974-09-28 1976-04-15 Bosch Gmbh Robert CIRCUIT ARRANGEMENT FOR AUTOMATIC GAMMA ADJUSTMENT

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2283611A1 (en) * 1974-08-30 1976-03-26 Thomson Csf DEVICE FOR CONTROLLING THE REST FREQUENCY OF A COLOR TELEVISION SUB-CARRIER AND CORRESPONDING ENCODERS FOR THE SECAM SYSTEM
DE2935582A1 (en) * 1978-09-02 1980-03-06 Marconi Instruments Ltd METHOD FOR GENERATING A FREQUENCY-MODULATED SIGNAL AND SIGNAL GENERATOR FOR THIS METHOD

Also Published As

Publication number Publication date
DE3013195C2 (en) 1982-11-11
GB2050105A (en) 1980-12-31
GB2050105B (en) 1983-06-15
DE3013195A1 (en) 1980-10-23
FR2453573B1 (en) 1986-05-02

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Legal Events

Date Code Title Description
ST Notification of lapse