JPS56156029A - Ssb multidirectional multiplex communication device - Google Patents
Ssb multidirectional multiplex communication deviceInfo
- Publication number
- JPS56156029A JPS56156029A JP6034180A JP6034180A JPS56156029A JP S56156029 A JPS56156029 A JP S56156029A JP 6034180 A JP6034180 A JP 6034180A JP 6034180 A JP6034180 A JP 6034180A JP S56156029 A JPS56156029 A JP S56156029A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- voice
- automatic gain
- gain control
- output
- 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
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
PURPOSE:To eliminate the necessity for transmission of a pilot signal among the slave stations and thus realize an inexpensive communication device, by securing a common use of the same channel among the slave stations and then giving feedback control to an automatic gain control circuit by the output of a mean-value wave detecting circuit for the output of a voice amplifying circuit. CONSTITUTION:A voice amplifying circuit 10 having an automatic gain control circuit is provided, and the mean value of amplitude is detected by a mean-value wave detecting circuit 11 for the output of the circuit 10 to give feedback control to the automatic gain control circuit with the detection output of the circuit 11. In such way, the signal level is equalized by means of a signal obtained by giving a wave detection to a voice signal to eliminate the necessity for transmission of a pilot signal among many slave stations. At the same time, each station is made to use the same channel in common. As a result, a direction-based automatic gain control circuit, a direction-based pilot signal and its detecting circuit plus a synthesizing circuit are disused. Thus a direction-based voice demodulating/amplifying circuit can be formed with a single voice demodulating circuit.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6034180A JPS56156029A (en) | 1980-05-06 | 1980-05-06 | Ssb multidirectional multiplex communication device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6034180A JPS56156029A (en) | 1980-05-06 | 1980-05-06 | Ssb multidirectional multiplex communication device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS56156029A true JPS56156029A (en) | 1981-12-02 |
Family
ID=13139357
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6034180A Pending JPS56156029A (en) | 1980-05-06 | 1980-05-06 | Ssb multidirectional multiplex communication device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS56156029A (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS49112516A (en) * | 1973-02-23 | 1974-10-26 | ||
JPS5388510A (en) * | 1977-01-14 | 1978-08-04 | Nec Corp | Simultaneous call preventing system for radio communication |
-
1980
- 1980-05-06 JP JP6034180A patent/JPS56156029A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS49112516A (en) * | 1973-02-23 | 1974-10-26 | ||
JPS5388510A (en) * | 1977-01-14 | 1978-08-04 | Nec Corp | Simultaneous call preventing system for radio communication |
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