JPS5531388A - Muting circuit of fm receiver - Google Patents

Muting circuit of fm receiver

Info

Publication number
JPS5531388A
JPS5531388A JP10539178A JP10539178A JPS5531388A JP S5531388 A JPS5531388 A JP S5531388A JP 10539178 A JP10539178 A JP 10539178A JP 10539178 A JP10539178 A JP 10539178A JP S5531388 A JPS5531388 A JP S5531388A
Authority
JP
Japan
Prior art keywords
signal
vca3
direct
current voltage
level
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
JP10539178A
Other languages
Japanese (ja)
Inventor
Junichi Shibata
Hiroki Aizawa
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.)
Pioneer Corp
Original Assignee
Pioneer Electronic Corp
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 Pioneer Electronic Corp filed Critical Pioneer Electronic Corp
Priority to JP10539178A priority Critical patent/JPS5531388A/en
Publication of JPS5531388A publication Critical patent/JPS5531388A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • 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
    • H03G3/341—Muting when no signals or only weak signals are present

Abstract

PURPOSE:To reduce noises without letting a listener feel a physical disorder due to muting by making a signal attenuation value in muting operation correspond to a demodulation level right before an electric field becomes slight. CONSTITUTION:Intermediate frequency signal A is inputted to direct-current voltage generating circuit 1 via capacitor C1. On detecting the level of signal A, circuit 1 applies inversion output D of a direct-current voltage in proportion to signal A to voltage control attenuator VCA3. Demodulated signal B, on the other hand, is inputted to voltage control attenuator 3 via capacitor C2. The output of VCA3 is led out via capacitor C3 and also inputted to direct-current voltage generating circuit 4. Circuit 4 applies VCA3 with direct-current voltage E in proportion to the input level. In inverse proportion to a difference between signals D and E, VCA3 increases in attenuation value; when the level of signal B is large, the attenuation value is small and when small, it is large, so that demodulated signal F will be outputted.
JP10539178A 1978-08-29 1978-08-29 Muting circuit of fm receiver Pending JPS5531388A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10539178A JPS5531388A (en) 1978-08-29 1978-08-29 Muting circuit of fm receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10539178A JPS5531388A (en) 1978-08-29 1978-08-29 Muting circuit of fm receiver

Publications (1)

Publication Number Publication Date
JPS5531388A true JPS5531388A (en) 1980-03-05

Family

ID=14406335

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10539178A Pending JPS5531388A (en) 1978-08-29 1978-08-29 Muting circuit of fm receiver

Country Status (1)

Country Link
JP (1) JPS5531388A (en)

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