JPS57136889A - Color killer circuit - Google Patents

Color killer circuit

Info

Publication number
JPS57136889A
JPS57136889A JP56022724A JP2272481A JPS57136889A JP S57136889 A JPS57136889 A JP S57136889A JP 56022724 A JP56022724 A JP 56022724A JP 2272481 A JP2272481 A JP 2272481A JP S57136889 A JPS57136889 A JP S57136889A
Authority
JP
Japan
Prior art keywords
signal
secam
small
output
filter
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
JP56022724A
Other languages
Japanese (ja)
Inventor
Takashi Misaki
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 JP56022724A priority Critical patent/JPS57136889A/en
Publication of JPS57136889A publication Critical patent/JPS57136889A/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
    • H04N9/79—Processing of colour television signals in connection with recording
    • H04N9/87—Regeneration of colour television signals

Landscapes

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

Abstract

PURPOSE:To increase the allowance for discriminaton miss, by connecting an input terminal of a color burst signal to a filter where 4.25MHz passes through and 4.4MHz is attenuated and discriminating the output variance period. CONSTITUTION:A filter 4 has a characteristic of 4.25MHz as passing region and 4.4MHz and 4.4MHz as attenuated regions. In case of a SECAM system color television signal (SECAM signal), an output waveform of a ceramic filter 4 is d' and a fH/2 AMP5 (where; fH is horizontal frequency) generates a signal e', and in case of a PAL color television signal where a Schmitt circuit 7 discriminates a SECAM signal, the output waveform of a ceramic filter 4 is d'' and the signal level is small. Thus, when a PAL signal is in dubbing, even if the level variance is produced into a waveform d''', since the energy of fH/2 is small, the output of the AMP5 is small as e' and the circuit 7 never discrminates the signal as a SECAM signal.
JP56022724A 1981-02-18 1981-02-18 Color killer circuit Pending JPS57136889A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56022724A JPS57136889A (en) 1981-02-18 1981-02-18 Color killer circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56022724A JPS57136889A (en) 1981-02-18 1981-02-18 Color killer circuit

Publications (1)

Publication Number Publication Date
JPS57136889A true JPS57136889A (en) 1982-08-24

Family

ID=12090714

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56022724A Pending JPS57136889A (en) 1981-02-18 1981-02-18 Color killer circuit

Country Status (1)

Country Link
JP (1) JPS57136889A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0518183U (en) * 1991-08-17 1993-03-05 三星電子株式会社 Broadcast signal detection circuit

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5086225A (en) * 1973-11-29 1975-07-11
JPS54158129A (en) * 1978-06-05 1979-12-13 Hitachi Ltd Color killer detection circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5086225A (en) * 1973-11-29 1975-07-11
JPS54158129A (en) * 1978-06-05 1979-12-13 Hitachi Ltd Color killer detection circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0518183U (en) * 1991-08-17 1993-03-05 三星電子株式会社 Broadcast signal detection circuit

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