JPS56782A - Automatic tuning unit - Google Patents

Automatic tuning unit

Info

Publication number
JPS56782A
JPS56782A JP7605879A JP7605879A JPS56782A JP S56782 A JPS56782 A JP S56782A JP 7605879 A JP7605879 A JP 7605879A JP 7605879 A JP7605879 A JP 7605879A JP S56782 A JPS56782 A JP S56782A
Authority
JP
Japan
Prior art keywords
signal
circuit
output
modulation
time constant
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
JP7605879A
Other languages
Japanese (ja)
Inventor
Takeshi Arai
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.)
Sanyo Electric Co Ltd
Original Assignee
Sanyo 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 Sanyo Electric Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP7605879A priority Critical patent/JPS56782A/en
Publication of JPS56782A publication Critical patent/JPS56782A/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
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/50—Tuning indicators; Automatic tuning control

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Television Receiver Circuits (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

PURPOSE:To increase the channel selection speed in digital channel selector, by providing the means to pick up the horizontal synchronizing signal or its vicinity for the signal obtained through frequency discrimination. CONSTITUTION:The output of the frequency discrimination circuit 8 is rejected for the video carrier, and the video component in amplitude modulation is fed to the gate circuit 13 via the smoothing circuit 12 having small time constant not filtered. Since this gate circuit 13 takes the horizontal deflection pulse or the synchronizing signal in amplitude separation as the gate signal S, this output is almost a constant amplitude pulse train signal not effected with the degree of modulation of the video signal. Accordingly, the S-shaped voltage waveform not depending on the degree of modulation of the video signal is obtained by passing through this output to the smoothing circuit 14. Further, the time constant of the smoothing circuit 14 can also be set smaller, the lowering in the channel selection speed by the time constant can be avoided and the speed can be increased.
JP7605879A 1979-06-15 1979-06-15 Automatic tuning unit Pending JPS56782A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7605879A JPS56782A (en) 1979-06-15 1979-06-15 Automatic tuning unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7605879A JPS56782A (en) 1979-06-15 1979-06-15 Automatic tuning unit

Publications (1)

Publication Number Publication Date
JPS56782A true JPS56782A (en) 1981-01-07

Family

ID=13594167

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7605879A Pending JPS56782A (en) 1979-06-15 1979-06-15 Automatic tuning unit

Country Status (1)

Country Link
JP (1) JPS56782A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57135582A (en) * 1981-02-16 1982-08-21 Hitachi Ltd Reception circuit for fm television signal
JPS57135581A (en) * 1981-02-16 1982-08-21 Hitachi Ltd Reception circuit for fm television signal
JPS58111522A (en) * 1981-12-25 1983-07-02 Sony Corp Aft circuit
JPS5964980A (en) * 1982-09-01 1984-04-13 アールシーエー　ライセンシング　コーポレーシヨン Tuning controller for television
US4546391A (en) * 1982-02-04 1985-10-08 Olympus Optical Co., Ltd. Video signal recording apparatus
EP0344991A2 (en) * 1988-05-30 1989-12-06 Matsushita Electric Industrial Co., Ltd. AFC apparatus

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57135582A (en) * 1981-02-16 1982-08-21 Hitachi Ltd Reception circuit for fm television signal
JPS57135581A (en) * 1981-02-16 1982-08-21 Hitachi Ltd Reception circuit for fm television signal
JPS58111522A (en) * 1981-12-25 1983-07-02 Sony Corp Aft circuit
US4546391A (en) * 1982-02-04 1985-10-08 Olympus Optical Co., Ltd. Video signal recording apparatus
JPS5964980A (en) * 1982-09-01 1984-04-13 アールシーエー　ライセンシング　コーポレーシヨン Tuning controller for television
EP0344991A2 (en) * 1988-05-30 1989-12-06 Matsushita Electric Industrial Co., Ltd. AFC apparatus

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