JPS553236A - Pulse noise detection circuit - Google Patents
Pulse noise detection circuitInfo
- Publication number
- JPS553236A JPS553236A JP7561478A JP7561478A JPS553236A JP S553236 A JPS553236 A JP S553236A JP 7561478 A JP7561478 A JP 7561478A JP 7561478 A JP7561478 A JP 7561478A JP S553236 A JPS553236 A JP S553236A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- noise
- detection
- level
- transistor
- 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 title abstract 8
- 230000007257 malfunction Effects 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
- H03G3/345—Muting during a short period of time when noise pulses are detected, i.e. blanking
Landscapes
- Manipulation Of Pulses (AREA)
- Control Of Amplification And Gain Control (AREA)
- Noise Elimination (AREA)
Abstract
PURPOSE:To avoid occurrence the malfunction caused by the continuous noise level for the detection circuit for the pulse noise contained in the radio reception signals by varying the detection level of the pulse noise according to the gain control. CONSTITUTION:The input signals of the high frequency component of the continuous noise such as the pulse noise, the white noise and the like are applied to differential amplifier circuit 2, and the output is applied to full-wave rectifier circuit 27 and 28. And the output of circuit 27 is applied to continuous noise level detection circuit 29 to generate the gain control signals according to the noise level, and the pulse noise in the output signals of circuit 28 is detected by detection circuit 30. Current I4 identical to the collector current of transistor 22 flows to driving transistor 44 of circuit 30, and transistor 8 and 9 are controlled by the gain control signals. By-pass transistor 41 conducts according to current I4, and the detection level of detection transistor 38 varies. As a result, the noise level increases to increase the gain control signals, thus the detection level being increased.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7561478A JPS553236A (en) | 1978-06-21 | 1978-06-21 | Pulse noise detection circuit |
| US06/023,408 US4289981A (en) | 1978-06-21 | 1979-03-23 | Pulsive component detecting apparatus |
| DE2912689A DE2912689C2 (en) | 1978-06-21 | 1979-03-30 | Device for detecting impulsive interference signals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7561478A JPS553236A (en) | 1978-06-21 | 1978-06-21 | Pulse noise detection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS553236A true JPS553236A (en) | 1980-01-11 |
| JPS6143890B2 JPS6143890B2 (en) | 1986-09-30 |
Family
ID=13581255
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7561478A Granted JPS553236A (en) | 1978-06-21 | 1978-06-21 | Pulse noise detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS553236A (en) |
-
1978
- 1978-06-21 JP JP7561478A patent/JPS553236A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6143890B2 (en) | 1986-09-30 |
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