JPS5453901A - Channel selector - Google Patents

Channel selector

Info

Publication number
JPS5453901A
JPS5453901A JP12055777A JP12055777A JPS5453901A JP S5453901 A JPS5453901 A JP S5453901A JP 12055777 A JP12055777 A JP 12055777A JP 12055777 A JP12055777 A JP 12055777A JP S5453901 A JPS5453901 A JP S5453901A
Authority
JP
Japan
Prior art keywords
tuning
preset
generator
clock
circuit
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
JP12055777A
Other languages
Japanese (ja)
Inventor
Shigeo Matsuura
Eisaku Akutsu
Hiroshi Miyamoto
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 JP12055777A priority Critical patent/JPS5453901A/en
Publication of JPS5453901A publication Critical patent/JPS5453901A/en
Pending legal-status Critical Current

Links

Landscapes

  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

PURPOSE: To quicken the preset operation by automatic selection to the fine tuning preset with the reception signal and to the coarse tuning preset without it, by performing increase or decrease in the reception frequency through the use of two preset switches.
CONSTITUTION: In the channel selector converting the output of the clock pulse generator into analog quantity and applying it to the electronic tuner having the local oscillator of electronic control type as the tuning voltage, the first clock pulse generator 30 generating the pulse determining the changes in the tuning voltage and the second clock pulse generator 31 generating the clock pulse in higher frequency than that of the output pulse of the generator 30 are provided. Further, the tuning detection circuit 6 detecting that the tuning voltage is close to the optimum tuning point with the detection of the presence of the synchronizing signal, and the control circuit 5 controlled with the output of the circuit 6 are provided, and the circuit 5 feeds the clock lower in the generator 30 with the presence of the synchronizing signal to the counter 4 and the clock higher in the oscillator 31 with the absence of signal, allowing to perform fine and coarse preset automatically
COPYRIGHT: (C)1979,JPO&Japio
JP12055777A 1977-10-07 1977-10-07 Channel selector Pending JPS5453901A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12055777A JPS5453901A (en) 1977-10-07 1977-10-07 Channel selector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12055777A JPS5453901A (en) 1977-10-07 1977-10-07 Channel selector

Publications (1)

Publication Number Publication Date
JPS5453901A true JPS5453901A (en) 1979-04-27

Family

ID=14789245

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12055777A Pending JPS5453901A (en) 1977-10-07 1977-10-07 Channel selector

Country Status (1)

Country Link
JP (1) JPS5453901A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58210712A (en) * 1982-06-01 1983-12-08 Mitsubishi Electric Corp Manual digital tuning circuit
JPS625720U (en) * 1985-06-24 1987-01-14

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5111309A (en) * 1974-07-18 1976-01-29 Matsushita Electric Industrial Co Ltd Deijitaruchuuna
JPS5176901A (en) * 1974-09-25 1976-07-03 Texas Instruments Inc HOSOJUSHINKIDOCHOSOCHI

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5111309A (en) * 1974-07-18 1976-01-29 Matsushita Electric Industrial Co Ltd Deijitaruchuuna
JPS5176901A (en) * 1974-09-25 1976-07-03 Texas Instruments Inc HOSOJUSHINKIDOCHOSOCHI

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58210712A (en) * 1982-06-01 1983-12-08 Mitsubishi Electric Corp Manual digital tuning circuit
JPS625720U (en) * 1985-06-24 1987-01-14

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