JPS57141192A - Pal identity detector - Google Patents

Pal identity detector

Info

Publication number
JPS57141192A
JPS57141192A JP56027511A JP2751181A JPS57141192A JP S57141192 A JPS57141192 A JP S57141192A JP 56027511 A JP56027511 A JP 56027511A JP 2751181 A JP2751181 A JP 2751181A JP S57141192 A JPS57141192 A JP S57141192A
Authority
JP
Japan
Prior art keywords
pulse
frequency
pal
output
horizontal
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.)
Pending
Application number
JP56027511A
Other languages
Japanese (ja)
Inventor
Nobutake Kayama
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP56027511A priority Critical patent/JPS57141192A/en
Publication of JPS57141192A publication Critical patent/JPS57141192A/en
Pending 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
    • H04N9/64—Circuits for processing colour signals
    • H04N9/642—Multi-standard receivers

Abstract

PURPOSE:To perform stable operation without generating an erroneous detection signal by counting the frequency of an increase in a phase difference between a BCO (burst control oscillation) output and an input burst during vertical synchronism, and by generating a detection pulse as a PAL identity signal when the counted frequency is higher than an expected one. CONSTITUTION:An H pulse generating circuit 34 for sample holding type PAL which responds to a separated horizontal pulse is provided. During vertical synchronism, the frequency of an increase in phase difference between a BCO output and an input is counted and when the frequency is higher than an expected one, a detection pulse is generated and the output of OR between the detection pulse and an H pulse is employed as a clock pulse for a toggle FF, whose output is regarded as a PAL identity signal. Consequently, the frequency of an oscillator having the oscillation frequency FH of the circuit 34 is controlled and even if a horizontal separated pulse drops out, a DC level before the dropout is held, so the horizontal pulse 35 of a flywheel has no disorder of its period.
JP56027511A 1981-02-26 1981-02-26 Pal identity detector Pending JPS57141192A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56027511A JPS57141192A (en) 1981-02-26 1981-02-26 Pal identity detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56027511A JPS57141192A (en) 1981-02-26 1981-02-26 Pal identity detector

Publications (1)

Publication Number Publication Date
JPS57141192A true JPS57141192A (en) 1982-09-01

Family

ID=12223151

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56027511A Pending JPS57141192A (en) 1981-02-26 1981-02-26 Pal identity detector

Country Status (1)

Country Link
JP (1) JPS57141192A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4992919A (en) * 1972-12-28 1974-09-04
JPS55163993A (en) * 1979-05-31 1980-12-20 Thomson Brandt Method and apparatus for processing television signal reproducing signal

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4992919A (en) * 1972-12-28 1974-09-04
JPS55163993A (en) * 1979-05-31 1980-12-20 Thomson Brandt Method and apparatus for processing television signal reproducing signal

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