JPS5733836A - Automatic noise reducing circuit - Google Patents
Automatic noise reducing circuitInfo
- Publication number
- JPS5733836A JPS5733836A JP10773080A JP10773080A JPS5733836A JP S5733836 A JPS5733836 A JP S5733836A JP 10773080 A JP10773080 A JP 10773080A JP 10773080 A JP10773080 A JP 10773080A JP S5733836 A JPS5733836 A JP S5733836A
- Authority
- JP
- Japan
- Prior art keywords
- output
- low
- input level
- comparator
- pass filter
- 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
- H03G5/00—Tone control or bandwidth control in amplifiers
- H03G5/16—Automatic control
- H03G5/18—Automatic control in untuned amplifiers
Landscapes
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
- Noise Elimination (AREA)
Abstract
PURPOSE:To reduce a noise, by varying a high-frequency characteristic of a demoldulation output in accordance with a receiving input level. CONSTITUTION:An output of an AGC detecting circuit 11 which is varied in accordance with an input level of a receiver controls the gain of an intermediate frequency amplifying circuit 1, simultaneously is applied to a comparator 8, and its output controls a variable type low-pass filter 7. In case when a receiving input level is low, an output of the comparator 8 is operated so as to drop a high-frequency characteristic of the variable low-pass filter 7, narrows an equivalent noise band width, reduces a higher harmonic and a noise in an output of a low-frequency amplifier 9, and makes the receiving sensitivity satisfactory. In case when the receiving input level has exceeded a prescribed level, an output of the comparator 8 is operated so as to extend a high-frequency characteristic of the variable low-pass filter 7, and makes the receiving articulation satisfactory.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10773080A JPS5733836A (en) | 1980-08-07 | 1980-08-07 | Automatic noise reducing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10773080A JPS5733836A (en) | 1980-08-07 | 1980-08-07 | Automatic noise reducing circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5733836A true JPS5733836A (en) | 1982-02-24 |
Family
ID=14466491
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10773080A Pending JPS5733836A (en) | 1980-08-07 | 1980-08-07 | Automatic noise reducing circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5733836A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60221972A (en) * | 1984-04-19 | 1985-11-06 | Yuasa Battery Co Ltd | Sodium-sulfur battery |
| JPS60235368A (en) * | 1984-05-08 | 1985-11-22 | Yuasa Battery Co Ltd | Sodium-sulphur battery |
| JPS60235369A (en) * | 1984-05-08 | 1985-11-22 | Yuasa Battery Co Ltd | Sodium-sulphur battery |
| JPH0215579A (en) * | 1988-07-01 | 1990-01-19 | Hitachi Ltd | Na-s battery, operating and using method thereof and manufacture thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS49110205A (en) * | 1973-02-20 | 1974-10-21 | ||
| JPS5086915A (en) * | 1973-11-30 | 1975-07-12 | ||
| JPS52127140A (en) * | 1976-04-19 | 1977-10-25 | Matsushita Electric Ind Co Ltd | Receiver |
-
1980
- 1980-08-07 JP JP10773080A patent/JPS5733836A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS49110205A (en) * | 1973-02-20 | 1974-10-21 | ||
| JPS5086915A (en) * | 1973-11-30 | 1975-07-12 | ||
| JPS52127140A (en) * | 1976-04-19 | 1977-10-25 | Matsushita Electric Ind Co Ltd | Receiver |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60221972A (en) * | 1984-04-19 | 1985-11-06 | Yuasa Battery Co Ltd | Sodium-sulfur battery |
| JPS60235368A (en) * | 1984-05-08 | 1985-11-22 | Yuasa Battery Co Ltd | Sodium-sulphur battery |
| JPS60235369A (en) * | 1984-05-08 | 1985-11-22 | Yuasa Battery Co Ltd | Sodium-sulphur battery |
| JPH0215579A (en) * | 1988-07-01 | 1990-01-19 | Hitachi Ltd | Na-s battery, operating and using method thereof and manufacture thereof |
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