JPS57113686A - Dot interference reduction circuit - Google Patents

Dot interference reduction circuit

Info

Publication number
JPS57113686A
JPS57113686A JP50681A JP50681A JPS57113686A JP S57113686 A JPS57113686 A JP S57113686A JP 50681 A JP50681 A JP 50681A JP 50681 A JP50681 A JP 50681A JP S57113686 A JPS57113686 A JP S57113686A
Authority
JP
Japan
Prior art keywords
signal
chroma signal
chroma
signal component
period
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
JP50681A
Other languages
Japanese (ja)
Inventor
Shigeru Takegami
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP50681A priority Critical patent/JPS57113686A/en
Publication of JPS57113686A publication Critical patent/JPS57113686A/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
    • H04N9/646—Circuits for processing colour signals for image enhancement, e.g. vertical detail restoration, cross-colour elimination, contour correction, chrominance trapping filters

Abstract

PURPOSE:To reduce dot interference without deterioration resolution, by rejecting chroma signal components through the operation of them only the period of existence, for the chrominance signal components remained not cancelled in luminance components. CONSTITUTION:A delay device 1 delaying a composite video input signal of NTSC system by 1H period, and a chrominance signal processing circuit 5 and the like are provided. Assuming that no chroma signal is present on the n-th horizontal scanning line and the chroma signal appears on the n+1-th horizontal scanning line. In this case, although no chroma signal is in existence in an output signal (d) of the circuit 1 at the n+1-th scanning period, since the chroma signal component is present in an input signal (a), this chroma signal component is applied to the base of a transistor TR30. The emitter voltage of a TR4 is increased every time the chroma signal component appears for the output, and the gain to the luminance signal component is reduced. Thus, the luminance signal component without chroma signal component is supplied to the circuit 5.
JP50681A 1981-01-07 1981-01-07 Dot interference reduction circuit Pending JPS57113686A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP50681A JPS57113686A (en) 1981-01-07 1981-01-07 Dot interference reduction circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP50681A JPS57113686A (en) 1981-01-07 1981-01-07 Dot interference reduction circuit

Publications (1)

Publication Number Publication Date
JPS57113686A true JPS57113686A (en) 1982-07-15

Family

ID=11475646

Family Applications (1)

Application Number Title Priority Date Filing Date
JP50681A Pending JPS57113686A (en) 1981-01-07 1981-01-07 Dot interference reduction circuit

Country Status (1)

Country Link
JP (1) JPS57113686A (en)

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