JPS55143821A - Automatic frequency control unit - Google Patents

Automatic frequency control unit

Info

Publication number
JPS55143821A
JPS55143821A JP5210579A JP5210579A JPS55143821A JP S55143821 A JPS55143821 A JP S55143821A JP 5210579 A JP5210579 A JP 5210579A JP 5210579 A JP5210579 A JP 5210579A JP S55143821 A JPS55143821 A JP S55143821A
Authority
JP
Japan
Prior art keywords
circuit
output
signal
afc
components
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
JP5210579A
Other languages
Japanese (ja)
Other versions
JPS5951777B2 (en
Inventor
Akihisa Wada
Masakazu Aya
Tadaaki Nishiguchi
Kenji Katayama
Masakazu Teraoka
Yasuo Shioyama
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP54052105A priority Critical patent/JPS5951777B2/en
Publication of JPS55143821A publication Critical patent/JPS55143821A/en
Publication of JPS5951777B2 publication Critical patent/JPS5951777B2/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
    • H03J7/02—Automatic frequency control

Abstract

PURPOSE:To prevent buzz from being generated in the separate carrier-system TV receiver, by turning off a switch circuit by the output of an AM components detecting circuit when AM components are detected. CONSTITUTION:Video components may be output at the output of frequency converter 4 in case of power on, channel selection operation, large shift of the frequency of the first local oscillating circuit 2, and so on. In this case, since the video signal is an AM signal, an output is output from AM components detecting circuit 9 to turn off switch circuit 11. As a result, no AFC voltage is applied to the second local oscillating circuit 5, and therefore, AFC is not applied to the video signal, the chroma signal, the adjacent signal, and so on, and buzz is not generated from the speaker. Then, if the AFC voltage of circuit 11 is applied to circuit 2, the AFC circuit to circuit 2 from the video intermediate frequency amplifier can be needless.
JP54052105A 1979-04-26 1979-04-26 automatic frequency control device Expired JPS5951777B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP54052105A JPS5951777B2 (en) 1979-04-26 1979-04-26 automatic frequency control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP54052105A JPS5951777B2 (en) 1979-04-26 1979-04-26 automatic frequency control device

Publications (2)

Publication Number Publication Date
JPS55143821A true JPS55143821A (en) 1980-11-10
JPS5951777B2 JPS5951777B2 (en) 1984-12-15

Family

ID=12905564

Family Applications (1)

Application Number Title Priority Date Filing Date
JP54052105A Expired JPS5951777B2 (en) 1979-04-26 1979-04-26 automatic frequency control device

Country Status (1)

Country Link
JP (1) JPS5951777B2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS624207U (en) * 1985-06-26 1987-01-12
JPS63197681U (en) * 1987-06-08 1988-12-20

Also Published As

Publication number Publication date
JPS5951777B2 (en) 1984-12-15

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