JPS5720035A - Synthesizer receiver - Google Patents

Synthesizer receiver

Info

Publication number
JPS5720035A
JPS5720035A JP9538980A JP9538980A JPS5720035A JP S5720035 A JPS5720035 A JP S5720035A JP 9538980 A JP9538980 A JP 9538980A JP 9538980 A JP9538980 A JP 9538980A JP S5720035 A JPS5720035 A JP S5720035A
Authority
JP
Japan
Prior art keywords
terminal
low
tuning
high level
input
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
JP9538980A
Other languages
Japanese (ja)
Other versions
JPS6312410B2 (en
Inventor
Katsuhiko Miyanaga
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 JP9538980A priority Critical patent/JPS5720035A/en
Publication of JPS5720035A publication Critical patent/JPS5720035A/en
Publication of JPS6312410B2 publication Critical patent/JPS6312410B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/34—Muting amplifier when no signal is present or when only weak signals are present, or caused by the presence of noise signals, e.g. squelch systems
    • H03G3/348—Muting in response to a mechanical action or to power supply variations, e.g. during tuning; Click removal circuits

Landscapes

  • Superheterodyne Receivers (AREA)
  • Noise Elimination (AREA)

Abstract

PURPOSE:To eliminate a displeasing tone generated when a reference frequency is set, by operating a squelch circuit for a prescribed time by detecting a tuning pulse after the operation of tuning-speed changeover switch. CONSTITUTION:A tuning-speed changeover switch S is chaged over to differentiate the outputs of inverters 21 and 22 at 23 and 24, whose differential outputs are applied in the form of the sum to the set terminal S of an FF27. Consequently, the terminal Q' of the FF27 is set low. When a tunig pulse is supplied to an input terminal 13, on the other hand, the terminal Q' of an FF25 changes to a low level. Therefore, the output of an OR gate 28 is low during the said period to discharge a capacitor C4, and an output terminal 14 is made high, so that the signal of the terminal 14 decreases the response gain of a low-frequency amplifier to input frequency characteristics. When the terminal Q' of the FF27 returns to the high level, a diode D3 turns off and the terminal 14 is made low a prescribed time later to release the amplifier from the squelch operation. As the terminal Q' of the FF25 change to the high level, the FF27 is reset and the terminal Q' is held at the high level without reference to an input.
JP9538980A 1980-07-11 1980-07-11 Synthesizer receiver Granted JPS5720035A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9538980A JPS5720035A (en) 1980-07-11 1980-07-11 Synthesizer receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9538980A JPS5720035A (en) 1980-07-11 1980-07-11 Synthesizer receiver

Publications (2)

Publication Number Publication Date
JPS5720035A true JPS5720035A (en) 1982-02-02
JPS6312410B2 JPS6312410B2 (en) 1988-03-18

Family

ID=14136287

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9538980A Granted JPS5720035A (en) 1980-07-11 1980-07-11 Synthesizer receiver

Country Status (1)

Country Link
JP (1) JPS5720035A (en)

Also Published As

Publication number Publication date
JPS6312410B2 (en) 1988-03-18

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