JPS57185782A - Multiple discrimination circuit for character broadcast signal - Google Patents

Multiple discrimination circuit for character broadcast signal

Info

Publication number
JPS57185782A
JPS57185782A JP7035381A JP7035381A JPS57185782A JP S57185782 A JPS57185782 A JP S57185782A JP 7035381 A JP7035381 A JP 7035381A JP 7035381 A JP7035381 A JP 7035381A JP S57185782 A JPS57185782 A JP S57185782A
Authority
JP
Japan
Prior art keywords
circuit
signal
character
detection circuit
broadcast signal
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
JP7035381A
Other languages
Japanese (ja)
Inventor
Toyoji Yabe
Shigetoshi Murakami
Kiichi Hasegawa
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Priority to JP7035381A priority Critical patent/JPS57185782A/en
Publication of JPS57185782A publication Critical patent/JPS57185782A/en
Pending 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

Landscapes

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

Abstract

PURPOSE:To obtain a circuit with increased reliability for discrimination, by detecting a signal in the same frequency component as a signal of a clock run-in part of a character information signal and discriminating if the character broadcast is made. CONSTITUTION:A composite video signal from a video detection circuit 4 is mixed with a character signal from a decoder 6 at a mixer 5 and applied to a cathode ray tube and also to a data slice circuit 11 and a synchronizing separation circuit 12. When a character signal is superimposed in a vertical blandking period, the signal is digitized at the slice circuit 11 and applied to a data input terminal of a shift register 15 through and AND gate 13. A sinusoidal wave AO is outputted only at the gate period with an amplifier 16 tuned to a frequency (about 2.86MHz), and if the clock run-in is presented is discriminated at a detection circuit 34 via a detection circuit 31, a level comparison circuit 32 and an integrating circuit 33.
JP7035381A 1981-05-11 1981-05-11 Multiple discrimination circuit for character broadcast signal Pending JPS57185782A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7035381A JPS57185782A (en) 1981-05-11 1981-05-11 Multiple discrimination circuit for character broadcast signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7035381A JPS57185782A (en) 1981-05-11 1981-05-11 Multiple discrimination circuit for character broadcast signal

Publications (1)

Publication Number Publication Date
JPS57185782A true JPS57185782A (en) 1982-11-16

Family

ID=13428975

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7035381A Pending JPS57185782A (en) 1981-05-11 1981-05-11 Multiple discrimination circuit for character broadcast signal

Country Status (1)

Country Link
JP (1) JPS57185782A (en)

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