JPS6460117A - System for transmitting control signal - Google Patents

System for transmitting control signal

Info

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
Application number
JP21677487A
Other languages
Japanese (ja)
Inventor
Takeo Suzuki
Junji Matsuo
Takeshi Murata
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Toshiba Telecommunication System Engineering Corp
Original Assignee
Toshiba Corp
Toshiba Telecommunication System Engineering Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toshiba Corp, Toshiba Telecommunication System Engineering Corp filed Critical Toshiba Corp
Priority to JP21677487A priority Critical patent/JPS6460117A/en
Publication of JPS6460117A publication Critical patent/JPS6460117A/en
Pending legal-status Critical Current

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.
JP21677487A 1987-08-31 1987-08-31 System for transmitting control signal Pending JPS6460117A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (1)

* Cited by examiner, † Cited by third party
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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