JPS54146909A - Preset channel selection unit - Google Patents

Preset channel selection unit

Info

Publication number
JPS54146909A
JPS54146909A JP5452178A JP5452178A JPS54146909A JP S54146909 A JPS54146909 A JP S54146909A JP 5452178 A JP5452178 A JP 5452178A JP 5452178 A JP5452178 A JP 5452178A JP S54146909 A JPS54146909 A JP S54146909A
Authority
JP
Japan
Prior art keywords
counter
circuit
tuning
increased
operated
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.)
Granted
Application number
JP5452178A
Other languages
Japanese (ja)
Other versions
JPS6013571B2 (en
Inventor
Toshinori Murata
Shigeo Matsuura
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 JP5452178A priority Critical patent/JPS6013571B2/en
Priority to US06/035,101 priority patent/US4270215A/en
Priority to GB7915165A priority patent/GB2024548B/en
Priority to DE19792918529 priority patent/DE2918529A1/en
Publication of JPS54146909A publication Critical patent/JPS54146909A/en
Publication of JPS6013571B2 publication Critical patent/JPS6013571B2/en
Expired 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
    • H03J7/28—Automatic scanning over a band of frequencies where the scanning is accomplished by varying the electrical characteristics of a non-mechanically adjustable element using counters or frequency dividers

Landscapes

  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
  • Superheterodyne Receivers (AREA)

Abstract

PURPOSE:To detect automatically a channel number by counting the number of passing times of local oscillation frequencies corresponding to respective channels until the selection of a specific channel in the electronic tuning tuner having a voltage control-type local oscillator. CONSTITUTION:When preset start switch 17 is depressed, gate circuit 15 is operated to send pulses, which are generated by pulse generator circuit 16, to counter 10. The output of counter 10 is increased in the data value, and the output voltage of D/A converter 8 is increased, and the local oscillation frequency of electronic tuning 1 is increased. When the frequency reaches an optimum tuning point, tuning decision circuit 14 is operated, and gate circuit 15 becomes a non-operating state. At this time, three peak points are obtained from detection amplifier circuit 3 and are divided by factor 3 in circuit 5 and are sent to counter 6. As a result, since one pulse is added in counter 6 at every tuning time, the channel number can be detected automatically.
JP5452178A 1978-05-10 1978-05-10 Preset channel selection device Expired JPS6013571B2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP5452178A JPS6013571B2 (en) 1978-05-10 1978-05-10 Preset channel selection device
US06/035,101 US4270215A (en) 1978-05-10 1979-05-01 Channel indicator
GB7915165A GB2024548B (en) 1978-05-10 1979-05-01 Preset channel selection apparatus
DE19792918529 DE2918529A1 (en) 1978-05-10 1979-05-08 PRESET CHANNEL SELECTOR

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5452178A JPS6013571B2 (en) 1978-05-10 1978-05-10 Preset channel selection device

Publications (2)

Publication Number Publication Date
JPS54146909A true JPS54146909A (en) 1979-11-16
JPS6013571B2 JPS6013571B2 (en) 1985-04-08

Family

ID=12972952

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5452178A Expired JPS6013571B2 (en) 1978-05-10 1978-05-10 Preset channel selection device

Country Status (1)

Country Link
JP (1) JPS6013571B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6218189A (en) * 1985-07-16 1987-01-27 Pioneer Electronic Corp Terminal equipment in catv

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6218189A (en) * 1985-07-16 1987-01-27 Pioneer Electronic Corp Terminal equipment in catv
JPH0771280B2 (en) * 1985-07-16 1995-07-31 パイオニア株式会社 Terminal device in CATV

Also Published As

Publication number Publication date
JPS6013571B2 (en) 1985-04-08

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