JPS5597741A - Squelch circuit - Google Patents
Squelch circuitInfo
- Publication number
- JPS5597741A JPS5597741A JP638479A JP638479A JPS5597741A JP S5597741 A JPS5597741 A JP S5597741A JP 638479 A JP638479 A JP 638479A JP 638479 A JP638479 A JP 638479A JP S5597741 A JPS5597741 A JP S5597741A
- Authority
- JP
- Japan
- Prior art keywords
- noise
- circuit
- squelch
- output
- noise amplifier
- 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
Landscapes
- Noise Elimination (AREA)
Abstract
PURPOSE: To increase the lowest sensitivity input level while maintaining input level resolution near the highest sensitivity of a noise squelch, by providing a noise amplifier with an automatic gain control system.
CONSTITUTION: A demodulator output to terminal 1 is supplied to speaker 4 by way of de-emphasis circuit 2, switching circuit 9 and audio amplifier 3. In the demodulator output to terminal 1, high-pass filter 5 detects a noise of a band where no sound signal resides and the detection output is supplied to switching circuit 9 by way of electronic control type attenuator 10, noise amplifier 6, rectifying-smoothing circuit 7, and squelch operation-point adjustment circuit 8 to carry squelch operation out. The attenuation value of electronic control type attenuator 10 is automatically controled by a control signal obtained by passing the output of noise amplifier 6 through rectifying-smoothing circuit 11, so that even if a noise level would vary, the stable squelch operation will be brought to effect.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP638479A JPS5597741A (en) | 1979-01-20 | 1979-01-20 | Squelch circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP638479A JPS5597741A (en) | 1979-01-20 | 1979-01-20 | Squelch circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5597741A true JPS5597741A (en) | 1980-07-25 |
Family
ID=11636879
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP638479A Pending JPS5597741A (en) | 1979-01-20 | 1979-01-20 | Squelch circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5597741A (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5019365U (en) * | 1973-06-18 | 1975-03-04 | ||
JPS5358712A (en) * | 1976-11-08 | 1978-05-26 | Clarion Co Ltd | Noise detecting circuit |
JPS5382215A (en) * | 1976-12-28 | 1978-07-20 | Clarion Co Ltd | Noise detecting circuit |
-
1979
- 1979-01-20 JP JP638479A patent/JPS5597741A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5019365U (en) * | 1973-06-18 | 1975-03-04 | ||
JPS5358712A (en) * | 1976-11-08 | 1978-05-26 | Clarion Co Ltd | Noise detecting circuit |
JPS5382215A (en) * | 1976-12-28 | 1978-07-20 | Clarion Co Ltd | Noise detecting circuit |
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