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JPS5446416A - Search start-stop circuit of automatic channel selector - Google Patents

Search start-stop circuit of automatic channel selector

Info

Publication number
JPS5446416A
JPS5446416A JP11309477A JP11309477A JPS5446416A JP S5446416 A JPS5446416 A JP S5446416A JP 11309477 A JP11309477 A JP 11309477A JP 11309477 A JP11309477 A JP 11309477A JP S5446416 A JPS5446416 A JP S5446416A
Authority
JP
Japan
Prior art keywords
gate
circuit
search start
malfunction
tuning
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
JP11309477A
Other languages
Japanese (ja)
Inventor
Nobuo Minoura
Yasukazu Yoshinaga
Isao Matsumura
Takao Abumi
Kazuhiro Nakai
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.)
Sharp Corp
Original Assignee
Sharp 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 Sharp Corp filed Critical Sharp Corp
Priority to JP11309477A priority Critical patent/JPS5446416A/en
Publication of JPS5446416A publication Critical patent/JPS5446416A/en
Pending legal-status Critical Current

Links

Landscapes

  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

PURPOSE: To make accurate and rapid channel selections possible without malfunction, by generating a search start-stop signal on the basis of a synchronizing signal and AFT detection output signal in a TV receier.
CONSTITUTION: When either search start command or research start pulse is inputted to R-SFF13 via OR gate 14, AND gate 15 is opened to supply the clock pulse of generator 16 to tuning-voltage generating circuit 10, thereby starting sweep operation. On the other hand, local-oscillation nourmal-tuning-point detection circuit 17 detects a turning point where the detection output voltage of AFT circuit 4 changes from negative to positive during the search operation and then opens gate 18, which allows the vertical synchronizing signal from circuit 6 to be supplied to FF13, so that gate 15 will be closed, Consequently, artomatic channel selection can be realized without malfunction
COPYRIGHT: (C)1979,JPO&Japio
JP11309477A 1977-09-19 1977-09-19 Search start-stop circuit of automatic channel selector Pending JPS5446416A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11309477A JPS5446416A (en) 1977-09-19 1977-09-19 Search start-stop circuit of automatic channel selector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11309477A JPS5446416A (en) 1977-09-19 1977-09-19 Search start-stop circuit of automatic channel selector

Publications (1)

Publication Number Publication Date
JPS5446416A true JPS5446416A (en) 1979-04-12

Family

ID=14603321

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11309477A Pending JPS5446416A (en) 1977-09-19 1977-09-19 Search start-stop circuit of automatic channel selector

Country Status (1)

Country Link
JP (1) JPS5446416A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62100769U (en) * 1985-12-13 1987-06-26
JPS6318714A (en) * 1986-07-10 1988-01-26 Mitsubishi Electric Corp Channel selection device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3632864A (en) * 1969-06-02 1972-01-04 Rca Corp Signal seeking system for radio receivers with tuning indicating circuitry for controlling the signal seeking

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3632864A (en) * 1969-06-02 1972-01-04 Rca Corp Signal seeking system for radio receivers with tuning indicating circuitry for controlling the signal seeking

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62100769U (en) * 1985-12-13 1987-06-26
JPS6318714A (en) * 1986-07-10 1988-01-26 Mitsubishi Electric Corp Channel selection device

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