JPS5669975A - Ghost reducing device - Google Patents

Ghost reducing device

Info

Publication number
JPS5669975A
JPS5669975A JP14678179A JP14678179A JPS5669975A JP S5669975 A JPS5669975 A JP S5669975A JP 14678179 A JP14678179 A JP 14678179A JP 14678179 A JP14678179 A JP 14678179A JP S5669975 A JPS5669975 A JP S5669975A
Authority
JP
Japan
Prior art keywords
input signal
mentioned
ghost
delayed
delay line
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
JP14678179A
Other languages
Japanese (ja)
Inventor
Kenji Sato
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP14678179A priority Critical patent/JPS5669975A/en
Publication of JPS5669975A publication Critical patent/JPS5669975A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/21—Circuitry for suppressing or minimising disturbance, e.g. moiré or halo
    • H04N5/211—Ghost signal cancellation

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Picture Signal Circuits (AREA)

Abstract

PURPOSE:To reduce ghosts by simple circuit constitution with only one delay line. CONSTITUTION:Vertical synchronizing part V1 of a video signal, namely, input signal (a-2) has ghost S1 and lags the leading edge of the input signal by mT. The above-mentioned input signal is differentiated to obtain differential values alpha1 and beta1. The above-mentioned differential outputs are delayed by time nT to obtain differential values alpha2 and beta2 by tapped two-way delay line A. When differential value alpha2 is inputted in the period of mask pulse (d-2), on the other hand, peak detection pulse 14 is generated, and consequently switches 1b-nb are turned on; since differential value beta2 of the above-mentioned ghost is being delayed by time mT, it is held at the correspoinding position in memory C via the corresponding switch. Then, the propagation path of delay line A is changed over to supply an amplified-18 input signal, by which the above-mentioned held ghost differential value is multiplied D to obtain a signal delayed mT behind the original input signal. From the input signal, the above-mentioned multiplication output is subtracted 19 to obtain a video signal having the ghost eliminated.
JP14678179A 1979-11-13 1979-11-13 Ghost reducing device Pending JPS5669975A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14678179A JPS5669975A (en) 1979-11-13 1979-11-13 Ghost reducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14678179A JPS5669975A (en) 1979-11-13 1979-11-13 Ghost reducing device

Publications (1)

Publication Number Publication Date
JPS5669975A true JPS5669975A (en) 1981-06-11

Family

ID=15415381

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14678179A Pending JPS5669975A (en) 1979-11-13 1979-11-13 Ghost reducing device

Country Status (1)

Country Link
JP (1) JPS5669975A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2479626A1 (en) * 1980-03-31 1981-10-02 Sony Corp CIRCUIT FOR REMOVING A FANTOME VIDEO IMAGE
JPS58104575A (en) * 1981-12-17 1983-06-22 Sony Corp Ghost eliminating device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2479626A1 (en) * 1980-03-31 1981-10-02 Sony Corp CIRCUIT FOR REMOVING A FANTOME VIDEO IMAGE
JPS58104575A (en) * 1981-12-17 1983-06-22 Sony Corp Ghost eliminating device

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