JPS5498118A - Automatic frequency controller - Google Patents

Automatic frequency controller

Info

Publication number
JPS5498118A
JPS5498118A JP437778A JP437778A JPS5498118A JP S5498118 A JPS5498118 A JP S5498118A JP 437778 A JP437778 A JP 437778A JP 437778 A JP437778 A JP 437778A JP S5498118 A JPS5498118 A JP S5498118A
Authority
JP
Japan
Prior art keywords
frequency
video
circuit
detector circuit
output
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
JP437778A
Other languages
Japanese (ja)
Inventor
Toshio Murakami
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP437778A priority Critical patent/JPS5498118A/en
Publication of JPS5498118A publication Critical patent/JPS5498118A/en
Pending legal-status Critical Current

Links

Landscapes

  • Television Receiver Circuits (AREA)

Abstract

PURPOSE: To prevent tuning from being stabilized for sound signals of a prior adjacent channel, by detecting whether 1.5M Hz beat signals of the video detector output are present or not in AFC used in the tuner of a preset tuning-system television receiver.
CONSTITUTION: Video signals which are applied to video intermediate frequency circuit 1 are amplified and are applied to video detector circuit 2. 1.5M Hz beat which is the difference between the video carrier and the sound trap frequency is detected from the output of detector circuit 2 by beat signal detector circuit 4. When the local oscillated frequency is fluctuated to a lower frequency by any cause, 1.5M Hz components appear, and detector circuit 4 detects them and switches switch circuit 6 to the 7 side. Then, since the AFC voltage is switched from the output of frequency discriminator 3 to fixed voltage Ec, the local oscillated frequency is moved to a higher frequency; and when 1.5M Hz components disappear, the switch circuit is switched to the 8 side and is stabilized.
COPYRIGHT: (C)1979,JPO&Japio
JP437778A 1978-01-20 1978-01-20 Automatic frequency controller Pending JPS5498118A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP437778A JPS5498118A (en) 1978-01-20 1978-01-20 Automatic frequency controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP437778A JPS5498118A (en) 1978-01-20 1978-01-20 Automatic frequency controller

Publications (1)

Publication Number Publication Date
JPS5498118A true JPS5498118A (en) 1979-08-02

Family

ID=11582663

Family Applications (1)

Application Number Title Priority Date Filing Date
JP437778A Pending JPS5498118A (en) 1978-01-20 1978-01-20 Automatic frequency controller

Country Status (1)

Country Link
JP (1) JPS5498118A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5188124A (en) * 1975-01-31 1976-08-02

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5188124A (en) * 1975-01-31 1976-08-02

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