JPS568919A - Electronic tuning type channel selector - Google Patents

Electronic tuning type channel selector

Info

Publication number
JPS568919A
JPS568919A JP8403479A JP8403479A JPS568919A JP S568919 A JPS568919 A JP S568919A JP 8403479 A JP8403479 A JP 8403479A JP 8403479 A JP8403479 A JP 8403479A JP S568919 A JPS568919 A JP S568919A
Authority
JP
Japan
Prior art keywords
tuning point
tuning
arithmetic circuit
voltage
type 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.)
Granted
Application number
JP8403479A
Other languages
Japanese (ja)
Other versions
JPS6353732B2 (en
Inventor
Masachika Harada
Koji Asahi
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.)
Texas Instruments Japan Ltd
Original Assignee
Texas Instruments Japan 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 Texas Instruments Japan Ltd filed Critical Texas Instruments Japan Ltd
Priority to JP8403479A priority Critical patent/JPS568919A/en
Publication of JPS568919A publication Critical patent/JPS568919A/en
Publication of JPS6353732B2 publication Critical patent/JPS6353732B2/ja
Granted 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)

Abstract

PURPOSE:To obtain an accurate tuning point by detecting an AFT voltage reaching two threshold levels shifting from the best tuning point positively and negatively by a fixed value. CONSTITUTION:Once a frequency sweep reaches the 1st tuning point, namely, when the 1st tuning voltage X at the 1st tuning point is detected by information counter 9, arithmetic circuit 41 counts the output of a 1/4 counter that frquency- divides a clock input. At this time, information counter 9 keeps on counting and when the frequency sweep reaches the 2nd tuning point, the count operation of the arithmetic circuit is stopped. Denoting a voltage at the 2nd tuning point as Y, the final count value of the arithmetic circuit is represented as X+(Y-X)/4 and this value is stored in memory 8 at a fixed address as the best tuning point.
JP8403479A 1979-07-04 1979-07-04 Electronic tuning type channel selector Granted JPS568919A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8403479A JPS568919A (en) 1979-07-04 1979-07-04 Electronic tuning type channel selector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8403479A JPS568919A (en) 1979-07-04 1979-07-04 Electronic tuning type channel selector

Publications (2)

Publication Number Publication Date
JPS568919A true JPS568919A (en) 1981-01-29
JPS6353732B2 JPS6353732B2 (en) 1988-10-25

Family

ID=13819238

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8403479A Granted JPS568919A (en) 1979-07-04 1979-07-04 Electronic tuning type channel selector

Country Status (1)

Country Link
JP (1) JPS568919A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010124195A (en) * 2008-11-19 2010-06-03 Sony Corp Channel selecting device, channel selecting method, and program

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010124195A (en) * 2008-11-19 2010-06-03 Sony Corp Channel selecting device, channel selecting method, and program
US8248539B2 (en) 2008-11-19 2012-08-21 Sony Corporation Channel selecting device, channel selecting method, and program

Also Published As

Publication number Publication date
JPS6353732B2 (en) 1988-10-25

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