JPS6460117A - System for transmitting control signal - Google Patents
System for transmitting control signalInfo
- Publication number
- JPS6460117A JPS6460117A JP21677487A JP21677487A JPS6460117A JP S6460117 A JPS6460117 A JP S6460117A JP 21677487 A JP21677487 A JP 21677487A JP 21677487 A JP21677487 A JP 21677487A JP S6460117 A JPS6460117 A JP S6460117A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- sound
- control signal
- amplifying device
- detected
- 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
Abstract
PURPOSE:To securely prevent an unnecessary tone from being generated due to digital signals to be sent with preceding and succeeding to a sound signal by using such a way that a control signal divides a sound signal and a frequency band, transmitting them with overlapping and while the control signal comes, a sound amplifying device is operated. CONSTITUTION:When a signal is transmitted, a selecting call activating signal 101 is detected by a signal detecting unit 1 and a condition in which a system is operatable is obtained. Next, a sound signal 102 and a control signal 103 come with being overlapped, however, only the control signal 103 is given to a detecting circuit 3 by the operation of an HPF4 and an LPF 5 and only the sound signal 102 is given to a sound amplifying device 2. At first, the control signal 103 is detected by the detecting circuit 3 and the output is caused to be turned on. Then the sound amplifying device 2 starts amplifying operation and the sound signal 102 is amplified and given to a speaker 6. When the sound signal 102 is ended and the control signal 103 is not detected by the detecting circuit 3, the output is caused to be turned off and the sound amplifying device 2 stops the amplifying operation. Thus, the unnecessary tone due to the digital signal can be prevented from being generated.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21677487A JPS6460117A (en) | 1987-08-31 | 1987-08-31 | System for transmitting control signal |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21677487A JPS6460117A (en) | 1987-08-31 | 1987-08-31 | System for transmitting control signal |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6460117A true JPS6460117A (en) | 1989-03-07 |
Family
ID=16693684
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP21677487A Pending JPS6460117A (en) | 1987-08-31 | 1987-08-31 | System for transmitting control signal |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6460117A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2018207236A (en) * | 2017-05-31 | 2018-12-27 | 東芝インフラシステムズ株式会社 | Broadcast communication system, information providing device and signal transmission method |
-
1987
- 1987-08-31 JP JP21677487A patent/JPS6460117A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2018207236A (en) * | 2017-05-31 | 2018-12-27 | 東芝インフラシステムズ株式会社 | Broadcast communication system, information providing device and signal transmission method |
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