JPS57186843A - Tone squelch voice monitoring system - Google Patents
Tone squelch voice monitoring systemInfo
- Publication number
- JPS57186843A JPS57186843A JP56072570A JP7257081A JPS57186843A JP S57186843 A JPS57186843 A JP S57186843A JP 56072570 A JP56072570 A JP 56072570A JP 7257081 A JP7257081 A JP 7257081A JP S57186843 A JPS57186843 A JP S57186843A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- voice
- communication
- signal
- wave
- 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
- 238000012544 monitoring process Methods 0.000 title 1
- 238000001914 filtration Methods 0.000 abstract 2
- 230000005236 sound signal 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
Landscapes
- Transceivers (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
- Noise Elimination (AREA)
Abstract
PURPOSE:To execute an intraoffice communication when necessary, without disturbing the communication of other station, by outputting a regular voice in case of the intraoffice communication, and dropping a voice output automatically in case of communication with other station. CONSTITUTION:Communication is executed between stations by using in common the same frequency, a desired wave and an undesired wave are discriminated as to its signal by a tone squelch circuit 2, are inputted to an electric power amplifying circuit 3, and a working state of the circuit is monitored in accordance with whether a voice output from a loudspeaker 4 is large or small. This circuit 2 is constituted of a voice passing part 2a and a signal discriminating part 2b, and to the signal discriminating part 2b, a voice amplifying part 3a of the amplifying circuit 3 is connected through a resistor 16. Subsequently, a voice signal and a noise component contained in a tone signal are separated by a low frequency low band filtering circuit 1 and a high band filtering circuit 5, and when an undesired wave of the same frequency has been received, the circuit is set to a conducting state. On the other hand, when a desired wave has been received, an input to the circuit 3 is not reduced but a sound signal is outputted from the loudspeaker 4, by high impedance of the resistor 16.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56072570A JPS57186843A (en) | 1981-05-12 | 1981-05-12 | Tone squelch voice monitoring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56072570A JPS57186843A (en) | 1981-05-12 | 1981-05-12 | Tone squelch voice monitoring system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS57186843A true JPS57186843A (en) | 1982-11-17 |
Family
ID=13493157
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56072570A Pending JPS57186843A (en) | 1981-05-12 | 1981-05-12 | Tone squelch voice monitoring system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57186843A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5996952U (en) * | 1982-12-21 | 1984-06-30 | 富士通株式会社 | mobile radio equipment |
| JPH0549246U (en) * | 1991-12-03 | 1993-06-29 | 本田技研工業株式会社 | Jig for polishing spot facing cutter |
-
1981
- 1981-05-12 JP JP56072570A patent/JPS57186843A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5996952U (en) * | 1982-12-21 | 1984-06-30 | 富士通株式会社 | mobile radio equipment |
| JPS646603Y2 (en) * | 1982-12-21 | 1989-02-21 | ||
| JPH0549246U (en) * | 1991-12-03 | 1993-06-29 | 本田技研工業株式会社 | Jig for polishing spot facing cutter |
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