JPS5531387A - Muting circuit of fm receiver - Google Patents
Muting circuit of fm receiverInfo
- Publication number
- JPS5531387A JPS5531387A JP10539078A JP10539078A JPS5531387A JP S5531387 A JPS5531387 A JP S5531387A JP 10539078 A JP10539078 A JP 10539078A JP 10539078 A JP10539078 A JP 10539078A JP S5531387 A JPS5531387 A JP S5531387A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- direct
- generating circuit
- level
- vca3
- 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
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 develops a direct-current voltage across control voltage generating circuit 2 in proportion to signal A. Demodulated signal B, on the other hand, is inputted to voltage control attenuator CVA3 via capacitor C2. The output of VCA3 is led out via capacitor C3 and also inputted to direct-current voltage generating circuit 4, which outputs direct-current voltage E in proportion to the level. Control voltage generating circuit 2 adds applied voltages C and E and applies control voltage G, corresponding to the addition output, to VCA3. In inverse proportion of voltage G, 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.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10539078A JPS5531387A (en) | 1978-08-29 | 1978-08-29 | Muting circuit of fm receiver |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10539078A JPS5531387A (en) | 1978-08-29 | 1978-08-29 | Muting circuit of fm receiver |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5531387A true JPS5531387A (en) | 1980-03-05 |
Family
ID=14406310
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10539078A Pending JPS5531387A (en) | 1978-08-29 | 1978-08-29 | Muting circuit of fm receiver |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5531387A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5711539A (en) * | 1980-06-24 | 1982-01-21 | Toa Tokushu Denki Kk | Squelch circuit |
-
1978
- 1978-08-29 JP JP10539078A patent/JPS5531387A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5711539A (en) * | 1980-06-24 | 1982-01-21 | Toa Tokushu Denki Kk | Squelch circuit |
JPS6356729B2 (en) * | 1980-06-24 | 1988-11-09 | Toa Electric Co Ltd |
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