JPS555560A - Channel selection unit - Google Patents

Channel selection unit

Info

Publication number
JPS555560A
JPS555560A JP7894478A JP7894478A JPS555560A JP S555560 A JPS555560 A JP S555560A JP 7894478 A JP7894478 A JP 7894478A JP 7894478 A JP7894478 A JP 7894478A JP S555560 A JPS555560 A JP S555560A
Authority
JP
Japan
Prior art keywords
channel selection
channels
selection voltage
written
channel
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
JP7894478A
Other languages
Japanese (ja)
Inventor
Tetsuo Hori
Hiroshi Sobashima
Setsuo Okuda
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.)
Fujitsu General Ltd
Gen Co Ltd
Original Assignee
Fujitsu General Ltd
Gen 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 Fujitsu General Ltd, Gen Co Ltd filed Critical Fujitsu General Ltd
Priority to JP7894478A priority Critical patent/JPS555560A/en
Publication of JPS555560A publication Critical patent/JPS555560A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/18—Automatic scanning over a band of frequencies
    • H03J7/20—Automatic scanning over a band of frequencies where the scanning is accomplished by varying the electrical characteristics of a non-mechanically adjustable element
    • H03J7/24—Automatic scanning over a band of frequencies where the scanning is accomplished by varying the electrical characteristics of a non-mechanically adjustable element using varactors, i.e. voltage variable reactive diodes

Landscapes

  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

PURPOSE:To enable small capacity for the channel selection voltage memory, by memorizing the channel selection voltage as to some channels and forming the channel selection voltages for all the stations with the microprocessor based on the data. CONSTITUTION:Since there are 62 channels for UHF, the channel selection voltage for 15 channels share every other 5 channels is written in the non-voltatile memory in advance at factory. When the channel not written in is inputted with the ten-key, the microprocessor obtains the channel selection voltage of closest two channels to the input channel from the memory and produces the channel selection voltage to the channels not written in with the straight line approximation between the voltages. In this case, it is an important factor that the characeristic curve showing the relation of the local oscillation frequency versus the tuning voltage of the tuner can be regarded as a straight line to what extent.
JP7894478A 1978-06-29 1978-06-29 Channel selection unit Pending JPS555560A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7894478A JPS555560A (en) 1978-06-29 1978-06-29 Channel selection unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7894478A JPS555560A (en) 1978-06-29 1978-06-29 Channel selection unit

Publications (1)

Publication Number Publication Date
JPS555560A true JPS555560A (en) 1980-01-16

Family

ID=13675987

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7894478A Pending JPS555560A (en) 1978-06-29 1978-06-29 Channel selection unit

Country Status (1)

Country Link
JP (1) JPS555560A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5282101A (en) * 1975-12-29 1977-07-09 Matsushita Electric Ind Co Ltd Voltage generator

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5282101A (en) * 1975-12-29 1977-07-09 Matsushita Electric Ind Co Ltd Voltage generator

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