JPS5714209A - Squelch circuit - Google Patents
Squelch circuitInfo
- Publication number
- JPS5714209A JPS5714209A JP8893080A JP8893080A JPS5714209A JP S5714209 A JPS5714209 A JP S5714209A JP 8893080 A JP8893080 A JP 8893080A JP 8893080 A JP8893080 A JP 8893080A JP S5714209 A JPS5714209 A JP S5714209A
- Authority
- JP
- Japan
- Prior art keywords
- squelch
- amplifier
- frequency
- detector
- squelch circuit
- 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
- 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
- H03G3/344—Muting responsive to the amount of noise (noise squelch)
Landscapes
- Control Of Amplification And Gain Control (AREA)
- Noise Elimination (AREA)
Abstract
PURPOSE:To obtain a wide squelch range by branching a squelch circuit from an intermediate-frequency stage and by providing the squelch circuit with an AGC amplifier controlled with a squelch level control signal. CONSTITUTION:A squelch circuit 20 receives some branch part of an output from an intermediate-frequency filter 10 an intermediate-frequency amplifier 12, and it is inputted to a noise detector 32 by way of an AGC amplifier 22, an intermediate- frequency amplifier and detector 24, a high-pass filter 26, an electronic volume control 28, and a noise amplifer 30 to detect a noise component, thereby controlling an analog switch 16 provided between the detector of a receiver and an audio amplifier 18. Then, a manually controlled DC-level squelch control voltage input to a terminal 34 is supplied to the AGC amplifier 22 and electronic volume control 28 for control.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8893080A JPS5714209A (en) | 1980-06-30 | 1980-06-30 | Squelch circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8893080A JPS5714209A (en) | 1980-06-30 | 1980-06-30 | Squelch circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5714209A true JPS5714209A (en) | 1982-01-25 |
Family
ID=13956610
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8893080A Pending JPS5714209A (en) | 1980-06-30 | 1980-06-30 | Squelch circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5714209A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0372006A1 (en) * | 1987-10-30 | 1990-06-13 | FERNANDEZ, Emilio A | Improved paging device |
-
1980
- 1980-06-30 JP JP8893080A patent/JPS5714209A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0372006A1 (en) * | 1987-10-30 | 1990-06-13 | FERNANDEZ, Emilio A | Improved paging device |
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