JPS5457816A - Tuner - Google Patents

Tuner

Info

Publication number
JPS5457816A
JPS5457816A JP12474877A JP12474877A JPS5457816A JP S5457816 A JPS5457816 A JP S5457816A JP 12474877 A JP12474877 A JP 12474877A JP 12474877 A JP12474877 A JP 12474877A JP S5457816 A JPS5457816 A JP S5457816A
Authority
JP
Japan
Prior art keywords
frequency
circuit
signal
oscillator
normal
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
JP12474877A
Other languages
Japanese (ja)
Other versions
JPS5758085B2 (en
Inventor
Atsushi Kobayashi
Susumu Ide
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 JP12474877A priority Critical patent/JPS5457816A/en
Publication of JPS5457816A publication Critical patent/JPS5457816A/en
Publication of JPS5758085B2 publication Critical patent/JPS5758085B2/ja
Granted legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE: To obtain a tuner, which requires neither a tracking adjustment nor an AFT circuit, operating ordinarily only when normal broadcast waves exist.
CONSTITUTION: With switch SW1 closed, a sweep voltage is generated and with switch SW2 closed at the same time, intermediate frequency oscillator 7 is operated, so that a signal from antenna 1 will be applied to frequency mixer circuits 4 and 8 via high-frequency amplifier circuit 2 whose tuning frequency is controlled by sweep- voltage generating circit 3. In circuit 8, the output of oscillator 7 is mixed with a high-frequency input signal and a sum-frequency beat component generated as the result of it becomes equal invariably to a normal local oscillation frequency which corresponds to the frequency of the high-frequency input signal. Therefore, when the carrier frequency of a signal within the band of an input tuning circuit becomes equal to that of a normal video carrier signal, it agrees with one of frequencies at which a delay-line type oscillator can oscilate and driving delay-line type oscillator 9 by this output circuit causes a mode switching phenomenon, so that the frequency of its oscillation will change from the prior frequency into another frequency close to a new frequency applied discontinuously
COPYRIGHT: (C)1979,JPO&Japio
JP12474877A 1977-10-17 1977-10-17 Tuner Granted JPS5457816A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12474877A JPS5457816A (en) 1977-10-17 1977-10-17 Tuner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12474877A JPS5457816A (en) 1977-10-17 1977-10-17 Tuner

Publications (2)

Publication Number Publication Date
JPS5457816A true JPS5457816A (en) 1979-05-10
JPS5758085B2 JPS5758085B2 (en) 1982-12-08

Family

ID=14893127

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12474877A Granted JPS5457816A (en) 1977-10-17 1977-10-17 Tuner

Country Status (1)

Country Link
JP (1) JPS5457816A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5652347U (en) * 1979-09-29 1981-05-08

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6180286U (en) * 1984-07-03 1986-05-28

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5652347U (en) * 1979-09-29 1981-05-08

Also Published As

Publication number Publication date
JPS5758085B2 (en) 1982-12-08

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