JPS57123772A - Ghost elimination device - Google Patents

Ghost elimination device

Info

Publication number
JPS57123772A
JPS57123772A JP56203712A JP20371281A JPS57123772A JP S57123772 A JPS57123772 A JP S57123772A JP 56203712 A JP56203712 A JP 56203712A JP 20371281 A JP20371281 A JP 20371281A JP S57123772 A JPS57123772 A JP S57123772A
Authority
JP
Japan
Prior art keywords
ghost
output
signal
impulse response
circuits
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
JP56203712A
Other languages
Japanese (ja)
Other versions
JPS627750B2 (en
Inventor
Yoshizumi Eto
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 JP56203712A priority Critical patent/JPS57123772A/en
Publication of JPS57123772A publication Critical patent/JPS57123772A/en
Publication of JPS627750B2 publication Critical patent/JPS627750B2/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)
  • Noise Elimination (AREA)

Abstract

PURPOSE:To eliminate ghost correctly while relaxing the necessary precision of a circuit by supplying an output signal to a transversal filter which uses the accumulated value of impulse response of ghost in the output signal as a coefficient, and using a difference between an input signal and a filter output as an output signal. CONSTITUTION:From a step signal in an output signal from an output terminal 4, a differentiating circuit 2 finds impulse response, and a ghost component in the impulse response at each time is supplied to accumulation circuits 10a-10z of a transversal filter through a switch circuit 9. The sum of the products of outputs of the circuits 10a-10z and the output value of a shift register 5 is found by multipliers 6a-6z, and an adder 7. Further, a difference between the output of the adder 7 and the input signal is found by a subtracter 8. When the output signals of the multipliers 6a-6z do not correspond to the ghost component and the ghost component appears at the terminal 4, the remaining ghost component is supplied to the circuits 10a-10z again to eliminate the remaining ghost lastly, thus eliminating the ghost correctly.
JP56203712A 1981-12-18 1981-12-18 Ghost elimination device Granted JPS57123772A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56203712A JPS57123772A (en) 1981-12-18 1981-12-18 Ghost elimination device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56203712A JPS57123772A (en) 1981-12-18 1981-12-18 Ghost elimination device

Publications (2)

Publication Number Publication Date
JPS57123772A true JPS57123772A (en) 1982-08-02
JPS627750B2 JPS627750B2 (en) 1987-02-19

Family

ID=16478595

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56203712A Granted JPS57123772A (en) 1981-12-18 1981-12-18 Ghost elimination device

Country Status (1)

Country Link
JP (1) JPS57123772A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994017600A1 (en) * 1993-01-19 1994-08-04 Ntt Mobile Communications Network Inc. Method for removing interference wave, receiver and communication system which use the method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01166447U (en) * 1988-05-10 1989-11-21

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5227975A (en) * 1975-08-26 1977-03-02 Toyoda Mach Works Ltd Programmed feed control device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5227975A (en) * 1975-08-26 1977-03-02 Toyoda Mach Works Ltd Programmed feed control device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994017600A1 (en) * 1993-01-19 1994-08-04 Ntt Mobile Communications Network Inc. Method for removing interference wave, receiver and communication system which use the method

Also Published As

Publication number Publication date
JPS627750B2 (en) 1987-02-19

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