JPS57196676A - Character broadcast receiver - Google Patents

Character broadcast receiver

Info

Publication number
JPS57196676A
JPS57196676A JP8107581A JP8107581A JPS57196676A JP S57196676 A JPS57196676 A JP S57196676A JP 8107581 A JP8107581 A JP 8107581A JP 8107581 A JP8107581 A JP 8107581A JP S57196676 A JPS57196676 A JP S57196676A
Authority
JP
Japan
Prior art keywords
synchronizing signal
clock synchronizing
signal
gain control
given
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
JP8107581A
Other languages
Japanese (ja)
Other versions
JPS6253112B2 (en
Inventor
Masutomi Oota
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 JP8107581A priority Critical patent/JPS57196676A/en
Publication of JPS57196676A publication Critical patent/JPS57196676A/en
Publication of JPS6253112B2 publication Critical patent/JPS6253112B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/025—Systems for the transmission of digital non-picture data, e.g. of text during the active part of a television frame
    • H04N7/035—Circuits for the digital non-picture data signal, e.g. for slicing of the data signal, for regeneration of the data-clock signal, for error detection or correction of the data signal

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Television Systems (AREA)

Abstract

PURPOSE:To prevent malfunction due to a test signal, by automatically detecting a horizontal scanning period to which a clock synchronizing signal (character broadcast signal) is inserted, gating the clock synchronizing signal, detecting the amplitude fluctuation, and operating the automatic gain control. CONSTITUTION:A clock synchronizing signal only is gated at an analog switch 2 and given to a band pass filter 3. This signal is given to a comparator 4 and a clock synchronizing signal is counted with a counter 5 limited to a time when the clock synchronizing signal is located. On the other hand, the output of a filter 3 passes throuh an analog switch 12 only at the location of the clock synchronizing signal insertion of the horizontal scanning period, and the amplitude fluctuation of the clock synchronizing signal is detected with a peak hold circuit 13. This detected output is supplied to a gain control terminal of a video amplifying circuit 1.
JP8107581A 1981-05-29 1981-05-29 Character broadcast receiver Granted JPS57196676A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8107581A JPS57196676A (en) 1981-05-29 1981-05-29 Character broadcast receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8107581A JPS57196676A (en) 1981-05-29 1981-05-29 Character broadcast receiver

Publications (2)

Publication Number Publication Date
JPS57196676A true JPS57196676A (en) 1982-12-02
JPS6253112B2 JPS6253112B2 (en) 1987-11-09

Family

ID=13736259

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8107581A Granted JPS57196676A (en) 1981-05-29 1981-05-29 Character broadcast receiver

Country Status (1)

Country Link
JP (1) JPS57196676A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4953795A (en) * 1988-10-24 1990-09-04 Beloit Corporation Wood chip cracking apparatus

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53139923A (en) * 1977-05-13 1978-12-06 Matsushita Electric Ind Co Ltd Automatic gain control unit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53139923A (en) * 1977-05-13 1978-12-06 Matsushita Electric Ind Co Ltd Automatic gain control unit

Also Published As

Publication number Publication date
JPS6253112B2 (en) 1987-11-09

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