JPS5745778A - Automatic waveform equalizer for television signal - Google Patents

Automatic waveform equalizer for television signal

Info

Publication number
JPS5745778A
JPS5745778A JP55120589A JP12058980A JPS5745778A JP S5745778 A JPS5745778 A JP S5745778A JP 55120589 A JP55120589 A JP 55120589A JP 12058980 A JP12058980 A JP 12058980A JP S5745778 A JPS5745778 A JP S5745778A
Authority
JP
Japan
Prior art keywords
circuit
inputted
signal
test signal
waveform
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
JP55120589A
Other languages
Japanese (ja)
Inventor
Hiroshi Yamada
Koji Aoki
Kenji Watanabe
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP55120589A priority Critical patent/JPS5745778A/en
Publication of JPS5745778A publication Critical patent/JPS5745778A/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

Landscapes

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

Abstract

PURPOSE:To prevent the divergence due to over-compensation of a TV signal automatic equalizer and to make stable the automatic equalization of waveform, by stopping the operation of waveform equalization, if the voltage level of waveform exceeds a prescribed voltage range in the process of automatic waveform equalization. CONSTITUTION:A test signal in a TV signal is inputted to a transversal filter 12 via an input terminal 11, the output of the filter 12 is inputted to gain adjusting circuits 13(-l)-13m with equal equalizing period, and echo signals according to the equalizing information are produced from each of the circuits 13(-l)-13m. The echo signals are inputted to a sampling circuit 16 and a clock reproduction circuit 16' via a concentrated amplifier 14, and the test signal is sampled at the circuit 16 with the clock from the circuit 16' to be applied to an identification circuit 17, and it is compared with the standard test signal, if there is any distortion in the inputted test signal, a signal is inputted to a shift register 18 via an over-compensation detection circuit 21, allowing to control the circuit to cancel the distortion and the result is stored in a memory 19. The signal is applied to the circuit 13(-l)-13m via integrators 20(-l)-20m to prevent divergence due to the over-compensation.
JP55120589A 1980-09-02 1980-09-02 Automatic waveform equalizer for television signal Pending JPS5745778A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55120589A JPS5745778A (en) 1980-09-02 1980-09-02 Automatic waveform equalizer for television signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55120589A JPS5745778A (en) 1980-09-02 1980-09-02 Automatic waveform equalizer for television signal

Publications (1)

Publication Number Publication Date
JPS5745778A true JPS5745778A (en) 1982-03-15

Family

ID=14790005

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55120589A Pending JPS5745778A (en) 1980-09-02 1980-09-02 Automatic waveform equalizer for television signal

Country Status (1)

Country Link
JP (1) JPS5745778A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62272671A (en) * 1986-05-21 1987-11-26 Hitachi Ltd Ghost detecting circuit
US5335020A (en) * 1993-03-03 1994-08-02 Rca Thomson Licensing Corporation IIR ghost cancelling system with reduction of filter instability

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62272671A (en) * 1986-05-21 1987-11-26 Hitachi Ltd Ghost detecting circuit
US5335020A (en) * 1993-03-03 1994-08-02 Rca Thomson Licensing Corporation IIR ghost cancelling system with reduction of filter instability

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