JPS5733846A - Selective calling signal receiving system - Google Patents
Selective calling signal receiving systemInfo
- Publication number
- JPS5733846A JPS5733846A JP10772980A JP10772980A JPS5733846A JP S5733846 A JPS5733846 A JP S5733846A JP 10772980 A JP10772980 A JP 10772980A JP 10772980 A JP10772980 A JP 10772980A JP S5733846 A JPS5733846 A JP S5733846A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- receiver
- selective calling
- sensitivity
- calling signal
- 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
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Circuits Of Receivers In General (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
PURPOSE:To prevent a malfunction which is caused by radio waves of other zone using the same frequency, by reducing the sensitivity of a receiver when waiting for a selective calling signal, and returning the sensitivity of the receiver when a call signal of its own station has been detected. CONSTITUTION:When a receiver is in a waiting state, high-frequency attenuator switching circuits 81, 82 are in on-state, and it is connected with an antenna 1, the switching circuit 81, a high-frequency attenuator 7, the switching circuit 82 and a radio wave receiver 2, an input level is lowered, and only strong radio waves of a specific zone are received. When a call signal of the own station is detected in a selective calling signal detecting circuit 3 from a demodulation output, a demodulation output changeover switch 4 is turned on, simultaneously the high frequency attenuator switching circuits 81, 82 are turned off, connection of the antenna 1, the switching circuit 81, the switching circuit 82 and the radio wave receiving circuit 2 is formed, the sensitivity of the receiving circuit 2 is made maximum, and the demodulation output passes through the switch 4, is amplified by a low-frequency amplifying circuit 5, and after that, it is outputted from a loudspeaker 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10772980A JPS5733846A (en) | 1980-08-07 | 1980-08-07 | Selective calling signal receiving system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10772980A JPS5733846A (en) | 1980-08-07 | 1980-08-07 | Selective calling signal receiving system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5733846A true JPS5733846A (en) | 1982-02-24 |
Family
ID=14466462
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10772980A Pending JPS5733846A (en) | 1980-08-07 | 1980-08-07 | Selective calling signal receiving system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5733846A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5953646A (en) * | 1994-06-30 | 1999-09-14 | Nec Corporation | System for controlling power consumption of a mobile radio communication device during standby using signal error rate |
-
1980
- 1980-08-07 JP JP10772980A patent/JPS5733846A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5953646A (en) * | 1994-06-30 | 1999-09-14 | Nec Corporation | System for controlling power consumption of a mobile radio communication device during standby using signal error rate |
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