JPS5768933A - Fm receiver - Google Patents
Fm receiverInfo
- Publication number
- JPS5768933A JPS5768933A JP14491080A JP14491080A JPS5768933A JP S5768933 A JPS5768933 A JP S5768933A JP 14491080 A JP14491080 A JP 14491080A JP 14491080 A JP14491080 A JP 14491080A JP S5768933 A JPS5768933 A JP S5768933A
- Authority
- JP
- Japan
- Prior art keywords
- detector
- output
- muting
- signal level
- detecting
- 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
Links
- 238000001514 detection method Methods 0.000 abstract 1
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
- H03G3/341—Muting when no signals or only weak signals are present
Landscapes
- Noise Elimination (AREA)
Abstract
PURPOSE:To improve the tracking performance to the reception level change of muting operation, by detecting a minimum value of reception signal level and giving muting to the FM detection output when this minimum value is smaller than the specified value. CONSTITUTION:The output of a signal level detector 11 detecting a signal level of an intermediate frequency signal is inputted to a minute voltage detector 31. This detector 31 detects the lowest voltage from a variable voltage applied to the input and stores the result for a set time. If the output of the detector 11 falls down through the variance by the interference on electromagnetic wave propagation, the output of the detector 31 follows it for reduction, and muting can be given to a switch circuit 19 via an AND circuit 13, allowing to avoid unpleasant noise from an FM receiver. The time constant is selected so that the output of the detector 31 is stored for the set time and since the muting is released so that output can be made gradually without rapid release of muting, audible unpleasantness is made less.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14491080A JPS5768933A (en) | 1980-10-16 | 1980-10-16 | Fm receiver |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14491080A JPS5768933A (en) | 1980-10-16 | 1980-10-16 | Fm receiver |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5768933A true JPS5768933A (en) | 1982-04-27 |
JPS6213853B2 JPS6213853B2 (en) | 1987-03-30 |
Family
ID=15373115
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14491080A Granted JPS5768933A (en) | 1980-10-16 | 1980-10-16 | Fm receiver |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5768933A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4525868A (en) * | 1982-03-23 | 1985-06-25 | Nippon Electric Co., Ltd. | Interference wave detection circuit for use in radio receiver |
-
1980
- 1980-10-16 JP JP14491080A patent/JPS5768933A/en active Granted
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4525868A (en) * | 1982-03-23 | 1985-06-25 | Nippon Electric Co., Ltd. | Interference wave detection circuit for use in radio receiver |
Also Published As
Publication number | Publication date |
---|---|
JPS6213853B2 (en) | 1987-03-30 |
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