JPS55147884A - Aft circuit of television receiver - Google Patents

Aft circuit of television receiver

Info

Publication number
JPS55147884A
JPS55147884A JP5605679A JP5605679A JPS55147884A JP S55147884 A JPS55147884 A JP S55147884A JP 5605679 A JP5605679 A JP 5605679A JP 5605679 A JP5605679 A JP 5605679A JP S55147884 A JPS55147884 A JP S55147884A
Authority
JP
Japan
Prior art keywords
circuit
frequency
aft
output
tuner
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
JP5605679A
Other languages
Japanese (ja)
Other versions
JPS6323715B2 (en
Inventor
Eiichi Itani
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.)
Sanyo Electric Co Ltd
Original Assignee
Sanyo Electric 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 Sanyo Electric Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP5605679A priority Critical patent/JPS55147884A/en
Publication of JPS55147884A publication Critical patent/JPS55147884A/en
Publication of JPS6323715B2 publication Critical patent/JPS6323715B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/50—Tuning indicators; Automatic tuning control

Abstract

PURPOSE:To make the AFT operation sure by generating the stop signal for the control operation of a local oscillation frequency from vertical synchronizing signal components extracted from the output of a frequency discriminating circuit, in the AFT circuit of the TV receiver of the frequency synthesizer system. CONSTITUTION:Tuner 1 incorporating local oscillator VCO 2 is controlled by PLL circuit 5. Shift of the receiving frequency is detected by frequency discriminating circuit 14, and this detection output is compensated by controlling the frequency division ratio of programmable frequency dividing circuit 7 through DC amplifying circuit 15. Vertical synchronizing components extracting circuit 27 stops the frequency division ratio change operation of circuit 14 through controller 8 by the output of circuit 14 and vertical blanking pulses when the local oscillation frequency of tuner 1 enters within a prescribed frequency range. Consequently, hunting can be prevented, and the AFT operation is stabilized.
JP5605679A 1979-05-07 1979-05-07 Aft circuit of television receiver Granted JPS55147884A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5605679A JPS55147884A (en) 1979-05-07 1979-05-07 Aft circuit of television receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5605679A JPS55147884A (en) 1979-05-07 1979-05-07 Aft circuit of television receiver

Publications (2)

Publication Number Publication Date
JPS55147884A true JPS55147884A (en) 1980-11-18
JPS6323715B2 JPS6323715B2 (en) 1988-05-17

Family

ID=13016416

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5605679A Granted JPS55147884A (en) 1979-05-07 1979-05-07 Aft circuit of television receiver

Country Status (1)

Country Link
JP (1) JPS55147884A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5964980A (en) * 1982-09-01 1984-04-13 アールシーエー　ライセンシング　コーポレーシヨン Tuning controller for television
EP0237167A2 (en) * 1986-01-31 1987-09-16 RCA Thomson Licensing Corporation Television tuning system with aft provisions
US5065244A (en) * 1989-07-11 1991-11-12 Sony Corporation Automatic fine tuning circuit

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5266305A (en) * 1975-11-26 1977-06-01 Matsushita Electronics Corp Frequency synthesizer tuner for television receiver
JPS5422124A (en) * 1977-07-20 1979-02-19 Mitsubishi Electric Corp Automatic fine adjustment circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5266305A (en) * 1975-11-26 1977-06-01 Matsushita Electronics Corp Frequency synthesizer tuner for television receiver
JPS5422124A (en) * 1977-07-20 1979-02-19 Mitsubishi Electric Corp Automatic fine adjustment circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5964980A (en) * 1982-09-01 1984-04-13 アールシーエー　ライセンシング　コーポレーシヨン Tuning controller for television
EP0237167A2 (en) * 1986-01-31 1987-09-16 RCA Thomson Licensing Corporation Television tuning system with aft provisions
US5065244A (en) * 1989-07-11 1991-11-12 Sony Corporation Automatic fine tuning circuit

Also Published As

Publication number Publication date
JPS6323715B2 (en) 1988-05-17

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