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JPS6486715A - Automatic frequency control circuit - Google Patents

Automatic frequency control circuit

Info

Publication number
JPS6486715A
JPS6486715A JP62245478A JP24547887A JPS6486715A JP S6486715 A JPS6486715 A JP S6486715A JP 62245478 A JP62245478 A JP 62245478A JP 24547887 A JP24547887 A JP 24547887A JP S6486715 A JPS6486715 A JP S6486715A
Authority
JP
Japan
Prior art keywords
signal
frequency
difference data
pulse
counter
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
JP62245478A
Other languages
Japanese (ja)
Inventor
Yoshikatsu Matsugaki
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.)
Toshiba Corp
Original Assignee
Toshiba 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 Toshiba Corp filed Critical Toshiba Corp
Priority to JP62245478A priority Critical patent/JPS6486715A/en
Publication of JPS6486715A publication Critical patent/JPS6486715A/en
Pending legal-status Critical Current

Links

Landscapes

  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

PURPOSE:To stabilize frequency with a high precision by converting the frequency signal outputted from a frequency signal generating part to a pulse signal and counting this pulse signal at intervals of a certain time in evert certain period and obtaining difference data from reference data. CONSTITUTION:A frequency signal a(t) is converted to a pulse signal corresponding to the frequency by a comparator 18 and is inputted to a counter 19. A gate pulse b(t) is generated from a quartz oscillator or the like by a stable clock based on a synchronizing signal separated from a television signal. A counted value c(t) of the counter 19 is latched and is compared with reference data Dref by a digital computing element 21 to calculate difference data. Thus difference data is converted to an analog signal g(t) by a D/A converter 22 and is added to an input television signal Sin through a loop filter 17 by an adder 11 to adjust the control level of a VCO circuit 12.
JP62245478A 1987-09-29 1987-09-29 Automatic frequency control circuit Pending JPS6486715A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62245478A JPS6486715A (en) 1987-09-29 1987-09-29 Automatic frequency control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62245478A JPS6486715A (en) 1987-09-29 1987-09-29 Automatic frequency control circuit

Publications (1)

Publication Number Publication Date
JPS6486715A true JPS6486715A (en) 1989-03-31

Family

ID=17134257

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62245478A Pending JPS6486715A (en) 1987-09-29 1987-09-29 Automatic frequency control circuit

Country Status (1)

Country Link
JP (1) JPS6486715A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04302217A (en) * 1991-03-29 1992-10-26 Sanyo Electric Co Ltd Voltage controlled oscillation circuit
JPH0795056A (en) * 1993-05-10 1995-04-07 Internatl Business Mach Corp <Ibm> Variable frequency standard clock formation device
JPH08139593A (en) * 1994-11-15 1996-05-31 Nec Corp Oscillation circuit

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5636234A (en) * 1979-08-31 1981-04-09 Matsushita Electric Ind Co Ltd Frequency following type voltage control oscillating unit
JPS5730334A (en) * 1980-07-31 1982-02-18 Toshiba Corp Protection of wiring layer

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5636234A (en) * 1979-08-31 1981-04-09 Matsushita Electric Ind Co Ltd Frequency following type voltage control oscillating unit
JPS5730334A (en) * 1980-07-31 1982-02-18 Toshiba Corp Protection of wiring layer

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04302217A (en) * 1991-03-29 1992-10-26 Sanyo Electric Co Ltd Voltage controlled oscillation circuit
JPH0795056A (en) * 1993-05-10 1995-04-07 Internatl Business Mach Corp <Ibm> Variable frequency standard clock formation device
JPH08139593A (en) * 1994-11-15 1996-05-31 Nec Corp Oscillation circuit

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