JPS54159814A - Television ghost erasing unit - Google Patents

Television ghost erasing unit

Info

Publication number
JPS54159814A
JPS54159814A JP6925978A JP6925978A JPS54159814A JP S54159814 A JPS54159814 A JP S54159814A JP 6925978 A JP6925978 A JP 6925978A JP 6925978 A JP6925978 A JP 6925978A JP S54159814 A JPS54159814 A JP S54159814A
Authority
JP
Japan
Prior art keywords
signals
horizontal
vertical synchronizing
ghost erasing
comparator circuit
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
JP6925978A
Other languages
Japanese (ja)
Other versions
JPS6145915B2 (en
Inventor
Shinichi Makino
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 JP6925978A priority Critical patent/JPS54159814A/en
Publication of JPS54159814A publication Critical patent/JPS54159814A/en
Publication of JPS6145915B2 publication Critical patent/JPS6145915B2/ja
Granted 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 prevent unstable operations by operating a ghost erasing unit only when horizontal and vertical synchronizing signals of inputted TV signals have a prescribed frequency relation corresponding to normal broadcasting waves. CONSTITUTION:Input signals Vin are supplied at horizontal synchronizing separator circuit 24 and vertical synchronizing separator circuit 25, and horizontal synchronizing signals are applied to comparator circuit 28 through frequency divider 26 and window signal generator circuit 27. The comparator circuit generates signal P1 if vertical synchronizing signals exist during the period of window signals, and the comparator circuit generates signal P2 otherwise. These signals are supplied to counters 30 and 31, and these counters generate signals PN and PM when N-number M-number signals P1 and P2 are counted respectively. Consequently, FF 33 is reset to stop the ghost erasing operation when P2/ P1> M/N is true. In case of a normal TV signal, the ghost erasing operation is normally operated because horizontal and vertical synchronizing signals are stable and the relation above is not satisfied.
JP6925978A 1978-06-08 1978-06-08 Television ghost erasing unit Granted JPS54159814A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6925978A JPS54159814A (en) 1978-06-08 1978-06-08 Television ghost erasing unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6925978A JPS54159814A (en) 1978-06-08 1978-06-08 Television ghost erasing unit

Publications (2)

Publication Number Publication Date
JPS54159814A true JPS54159814A (en) 1979-12-18
JPS6145915B2 JPS6145915B2 (en) 1986-10-11

Family

ID=13397525

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6925978A Granted JPS54159814A (en) 1978-06-08 1978-06-08 Television ghost erasing unit

Country Status (1)

Country Link
JP (1) JPS54159814A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56166675A (en) * 1980-05-28 1981-12-21 Toshiba Corp Television ghost eliminator
JPS57201383A (en) * 1981-06-04 1982-12-09 Matsushita Electric Ind Co Ltd Ghost removing device
JPS58104575A (en) * 1981-12-17 1983-06-22 Sony Corp Ghost eliminating device
US4476491A (en) * 1981-08-11 1984-10-09 Hitachi, Ltd. Ghost reduction circuit for television receiver

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56166675A (en) * 1980-05-28 1981-12-21 Toshiba Corp Television ghost eliminator
JPH0159790B2 (en) * 1980-05-28 1989-12-19 Toshiba Kk
JPS57201383A (en) * 1981-06-04 1982-12-09 Matsushita Electric Ind Co Ltd Ghost removing device
US4476491A (en) * 1981-08-11 1984-10-09 Hitachi, Ltd. Ghost reduction circuit for television receiver
JPS58104575A (en) * 1981-12-17 1983-06-22 Sony Corp Ghost eliminating device

Also Published As

Publication number Publication date
JPS6145915B2 (en) 1986-10-11

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