JPS5668024A - Channel selector - Google Patents

Channel selector

Info

Publication number
JPS5668024A
JPS5668024A JP14498279A JP14498279A JPS5668024A JP S5668024 A JPS5668024 A JP S5668024A JP 14498279 A JP14498279 A JP 14498279A JP 14498279 A JP14498279 A JP 14498279A JP S5668024 A JPS5668024 A JP S5668024A
Authority
JP
Japan
Prior art keywords
prescaler
pll
electric power
controller
channel selector
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
JP14498279A
Other languages
Japanese (ja)
Other versions
JPS5927531B2 (en
Inventor
Yoichi Sakamoto
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 JP14498279A priority Critical patent/JPS5927531B2/en
Publication of JPS5668024A publication Critical patent/JPS5668024A/en
Publication of JPS5927531B2 publication Critical patent/JPS5927531B2/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
    • H03J7/04—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant
    • H03J7/06—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant using counters or frequency dividers
    • H03J7/065—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant using counters or frequency dividers the counter or frequency divider being used in a phase locked loop

Landscapes

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

Abstract

PURPOSE:To prolong the life of a battery when the battery is used as the electric power supply of receiver, by cutting off the electric power supply to the prescaler of a PLL frequency synthesizer when an automatic tuner enters the tuning state. CONSTITUTION:When the transmission frequency of a desired selected channel arrives from input device 9, PLL/AFT switching controller 16 sets the channel selector in PLL mode and also controls prescaler electric power supply controller 21 to supply current from prescaler electric power terminal 22 to prescaler 2. As PLL is placed in locked state, phase lock detector 17 controls controller 16, whose output sets the channel selector in AFT mode and also controls controller 21 to cut off the electric power supply to prescaler 2. Once the channel selector enters the detuning state, information on the detuning is obtained from output circuit 19 and with the output of controller 16, the channel selector is changed over to the PLL mode again. When PLL is locked, on the other hand, the AFT mode is set again and the electric current to prescaler 2 is cut off.
JP14498279A 1979-11-08 1979-11-08 Channel selection device Expired JPS5927531B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14498279A JPS5927531B2 (en) 1979-11-08 1979-11-08 Channel selection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14498279A JPS5927531B2 (en) 1979-11-08 1979-11-08 Channel selection device

Publications (2)

Publication Number Publication Date
JPS5668024A true JPS5668024A (en) 1981-06-08
JPS5927531B2 JPS5927531B2 (en) 1984-07-06

Family

ID=15374719

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14498279A Expired JPS5927531B2 (en) 1979-11-08 1979-11-08 Channel selection device

Country Status (1)

Country Link
JP (1) JPS5927531B2 (en)

Also Published As

Publication number Publication date
JPS5927531B2 (en) 1984-07-06

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