JPS6490626A - Wide range mobile communication system - Google Patents
Wide range mobile communication systemInfo
- Publication number
- JPS6490626A JPS6490626A JP24581887A JP24581887A JPS6490626A JP S6490626 A JPS6490626 A JP S6490626A JP 24581887 A JP24581887 A JP 24581887A JP 24581887 A JP24581887 A JP 24581887A JP S6490626 A JPS6490626 A JP S6490626A
- Authority
- JP
- Japan
- Prior art keywords
- digital
- mode
- signal
- stations
- random number
- 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
Landscapes
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
PURPOSE:To attain wide range communication forming a radio communication system even with mixture of digital/analog communication systems by using a cryptographic device to a transmitter-receiver of a radio station so as to realize digital squelch. CONSTITUTION:The cryptographic device 5 is provided with selection means No.1 and No.2, the means No.1 selects any of radio lines and a most suitable MODEM 53 thereto in each digital station, and the means No.2 switches control modes A-C of a reception signal output. The mode A is the mode operated when all the stations have the device 5 and only when a random number synchronizing signal is detected in the digital reception output of the MODEM 53 in succession to the preamble signal, a decoded voice is outputted to a speaker 2 as a digital squelch function. The mode B is the mixed communication mode and from which of the digital and analog stations the signal is received is decided depending on the presence of the preamble signal of the receptionsection and the random number synchronizing signal, and both the stations are made receivable. The mode C is the mode receiving a signal sent from the MODEM 53 without using a random number device 52 and the digital transmission is provided to the line.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24581887A JPS6490626A (en) | 1987-10-01 | 1987-10-01 | Wide range mobile communication system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24581887A JPS6490626A (en) | 1987-10-01 | 1987-10-01 | Wide range mobile communication system |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6490626A true JPS6490626A (en) | 1989-04-07 |
JPH0473896B2 JPH0473896B2 (en) | 1992-11-24 |
Family
ID=17139307
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP24581887A Granted JPS6490626A (en) | 1987-10-01 | 1987-10-01 | Wide range mobile communication system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6490626A (en) |
-
1987
- 1987-10-01 JP JP24581887A patent/JPS6490626A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPH0473896B2 (en) | 1992-11-24 |
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