JPS5538788A - Tracking correction device for broadcast receiver - Google Patents

Tracking correction device for broadcast receiver

Info

Publication number
JPS5538788A
JPS5538788A JP11271578A JP11271578A JPS5538788A JP S5538788 A JPS5538788 A JP S5538788A JP 11271578 A JP11271578 A JP 11271578A JP 11271578 A JP11271578 A JP 11271578A JP S5538788 A JPS5538788 A JP S5538788A
Authority
JP
Japan
Prior art keywords
circuit
frequency
tuning
synthesizer
tracking
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
JP11271578A
Other languages
Japanese (ja)
Other versions
JPS6130770B2 (en
Inventor
Masaaki Maekawa
Koichi Nakano
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 JP11271578A priority Critical patent/JPS5538788A/en
Publication of JPS5538788A publication Critical patent/JPS5538788A/en
Publication of JPS6130770B2 publication Critical patent/JPS6130770B2/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
    • H03J7/02—Automatic frequency control
    • H03J7/04—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant
    • H03J7/06—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant using counters or frequency dividers
    • H03J7/065—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant using counters or frequency dividers the counter or frequency divider being used in a phase locked loop

Landscapes

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

Abstract

PURPOSE:To secure the optimum tuning for the superheterodyne receiver of synthesizer system using the PLL by controlling the variable capacity element for tracking correction provided to the local oscillation circuit when the output of the IF. CONSTITUTION:The frequency of local oscillation circuit B is controlled to (f+ 455kHz) via PLL synthesizer 4, along with the tuning frequency of signal tuning circuit A to f (reception frequency) respectively. The tracking error is caused by dispersion of variable capacity element C. Comparator 5 compares the output of IF circuit 2 with reference voltage V. Based on this comparison result, CPU6 controls D/A converter 9 to vary control voltage VTR of tracking correcting variable cap CTR. In this case, synthesizer 4 controls control voltage VC to prevent the variation of the local frequency. In other words, voltage VTR is controlled continuously until the tuning frequency of circuit A becomes f and circuit 5 detects the optimum tuning state.
JP11271578A 1978-09-12 1978-09-12 Tracking correction device for broadcast receiver Granted JPS5538788A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11271578A JPS5538788A (en) 1978-09-12 1978-09-12 Tracking correction device for broadcast receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11271578A JPS5538788A (en) 1978-09-12 1978-09-12 Tracking correction device for broadcast receiver

Publications (2)

Publication Number Publication Date
JPS5538788A true JPS5538788A (en) 1980-03-18
JPS6130770B2 JPS6130770B2 (en) 1986-07-16

Family

ID=14593693

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11271578A Granted JPS5538788A (en) 1978-09-12 1978-09-12 Tracking correction device for broadcast receiver

Country Status (1)

Country Link
JP (1) JPS5538788A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5457951A (en) * 1977-10-18 1979-05-10 Toshiba Corp Removal method for harmful object in electronic tube
JPS54139462A (en) * 1978-04-21 1979-10-29 Toshiba Corp Manufacture of color picture tube
JPS5823146A (en) * 1981-08-04 1983-02-10 Toshiba Corp Method of removing harmful matters existing in cathode- ray tube

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5457951A (en) * 1977-10-18 1979-05-10 Toshiba Corp Removal method for harmful object in electronic tube
JPS54139462A (en) * 1978-04-21 1979-10-29 Toshiba Corp Manufacture of color picture tube
JPS5823146A (en) * 1981-08-04 1983-02-10 Toshiba Corp Method of removing harmful matters existing in cathode- ray tube

Also Published As

Publication number Publication date
JPS6130770B2 (en) 1986-07-16

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