JPH0798793A - Discharge warning system - Google Patents

Abstract

PURPOSE:To prevent the sound of control signal which commands the end of the warning broadcasting from being sent from a speaker as to a discharge warning system of dam, etc. CONSTITUTION:In the discharge warning system provided with a voice signal sending means 2 on a control monitoring station 1 and sending a voice signal and a control signal to turn the power of a voice amplifier 4 on and off in a warning station 3 for the voice signal through a radio line to the warning station 3 by the same voice band, a control signal sending means 5 is provided on the control monitoring station 1 and converts the control signal into a modulation signal allocated at the end of the voice band at the transmission. A band-pass filter 6 is provided on the warning station 3 and selectively extracts the modulation signal. Further, a control signal accepting means 7 is provided to demodulate the extracted signal and accept the control signal. A low-pass filter 8 is provided to cut the modulation signal and inputs the only voice signal to the voice amplifier 4. With the accepted control signal, the power of the voice amplifier 4 is turned on and off.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alarm system for remotely controlling broadcast or alarm siren sounding indicating an emergency or warning condition, and particularly when a river such as a dam or weir is discharged or a river is suddenly flooded due to rainfall. The present invention relates to a discharge warning system for controlling warning broadcasts, warning sirens, river display boards, etc. for the purpose of protecting people and goods on the riverbank and calling attention to them.

In the discharge warning system, after the warning message is broadcast, the audio amplifier power supply of the alarm station is controlled to be turned off so that the broadcasting is stopped. Therefore, the control and monitoring station broadcasts to the alarm station via the same line. Send a stop signal. The alarm station demodulates and analyzes this signal, and executes a series of broadcast stop processing. At this time, it is necessary to prevent the audio frequency signal corresponding to the broadcast stop signal from being loudly transmitted as an unnecessary sound unrelated to the broadcast from the speaker.

[0003]

2. Description of the Related Art FIG. 5 shows a general configuration of a conventional discharge warning system to which the present invention is applied. 11 is a control / monitor station, 12 is a relay station, 13 _1, 13 _2, …
Indicates an alarm station. The control and monitoring station 11 transmits and receives control signals and transmits and receives control signals by wireless signals between the relay station 12 and the control and monitoring device 14 for transmitting and receiving various control signals related to the discharge warning and performing alarm broadcasting by voice. And a wireless device 15 for transmitting.

[0004] relay station 12, control monitoring station 11 and each alarm station 13 _1, 13 _2, ... and radio 16 for transmitting and receiving radio signals to and from a relay device for relaying the transmission and reception signal 17 Have and. Each alarm station 13 _1, 13 _2, ... Is a relay station 1
It has a wireless device 18 for transmitting and receiving wireless signals to and from the wireless communication device 2 and an alarm device 19 for issuing a discharge warning. The alarm device 19 has a siren 20 for generating a discharge warning sound, and a speaker 21 for sending a discharge warning message.

FIG. 6 shows an example of the configuration of a conventional control and monitoring device. An operation display unit 31 can perform various operations for issuing a discharge warning, and also performs related displays. Reference numeral 32 denotes an operation display control unit, which is an operation display unit 31.
The transmission and reception of various control signals and the control of the generation of display signals are performed based on the operation in. 33 is a call operation unit,
Performs the operation of sending the release warning message. Reference numeral 34 is a call function control unit, which controls the release warning message transmission based on the operation of the call operation unit 33.

A transmission control unit 35 controls transmission of various control signals between the operation display control unit 32 and the call function control unit 34. A modulator / demodulator 36 performs mutual modulation and demodulation of a transmission signal and a modem signal, for example.
A line input / output unit 37 connects the input / output signals of the modulation / demodulation unit 36 and the voice signal output from the call function control unit 34 to each other, and connects the line to the wireless device. A main control processing unit 38 controls and processes the entire operation of the control and monitoring device.

FIG. 7 shows an example of the configuration of a conventional alarm device. 41 is a line input / output unit, 42 is a modulation / demodulation unit, 4
Reference numeral 3 denotes a transmission control unit, which is a line input / output unit 37, a modulation / demodulation unit 36, a transmission control unit 35 in the control and monitoring device.
The control signal and the voice signal from the line are separated and transmitted. A siren control unit 44 controls the sounding of the discharge warning siren based on the siren sounding control signal (main control signal) from the transmission control unit 43.

Reference numeral 45 is a call function control unit, which transmits and receives a control signal (sub-control signal) relating to the start and stop of alarm broadcasting through the line input / output unit 41 to start and stop the voice amplifier 46. Control is performed and a voice signal (release warning message) is output to the voice amplifier 46. The audio amplifier 46 amplifies the audio signal and sends it to the speaker.

Reference numeral 47 is a main control processing unit which controls and processes the entire operation of the alarm device. Reference numeral 48 is a delay circuit inserted in the voice line connected to the line input / output unit 41, and has a function of delaying the voice signal for a predetermined time.

FIG. 8 shows an operation sequence of a conventional discharge warning system. When a broadcast start signal is sent as a control signal from the control monitoring station (master station) as a voice signal within the voice band when the broadcast is started, the alarm station (slave station) receives this signal to analyze the received information. Then, the speaker power supply (voice amplifier power supply) is turned on according to the analysis result. In this state, the master station broadcasts the release warning message by microphone, but the speaker output is delayed by a certain time by the delay circuit inserted in the voice line and sent out.

When the broadcast stop signal is sent as a control signal from the parent station as an in-voice band signal when the broadcast is stopped, the slave station receives this signal to analyze the received information, and depending on the analysis result. The speaker power is turned off, but at this time, the same delay circuit delays the broadcast stop signal in the audio line, so that the audio frequency signal corresponding to the broadcast stop signal is not sent from the speaker. Absent.

As described above, in the discharge warning system, the discharge warning message by the sound signal to the warning station and the control signal for starting and stopping the sound amplifier power supply for sending the sound are used in the same sound band. Is configured to be transmitted.

Therefore, in the alarm station, unnecessary sound is prevented from being transmitted from the speaker based on these control signals transmitted by the in-voice band signal, particularly the broadcast stop signal for turning off the power source of the alarm broadcast audio amplifier. For this reason, conventionally, a delay function is provided in an alarm station so that broadcast sound is delayed and sent from a speaker, and demodulation and analysis are executed without delaying a control signal.

In this case, the delay time depends on the control signal reception /
It is set according to the time from demodulation to control execution.
That is, the delay time is adjusted according to the communication speed of the control signal, or the delay time is adjusted according to the longest communication speed. The unnecessary sound is masked by the time difference set in this way.

[0015]

As described above, in the alarm station of the conventional discharge alarm system, the delay circuit is inserted in the audio line to delay the audio signal and the control signal, so that when the broadcasting is stopped, The audio frequency signal corresponding to the broadcast stop signal is prevented from being transmitted from the speaker during the period from the reception of the broadcast stop signal to the turning off of the speaker power supply.

However, when the delay circuit delays the audio signal for a long time, there is a problem that not only the sound quality is deteriorated by the delay element but also the economical burden due to the delay mechanism and the peripheral control circuit increases.

The present invention is intended to solve such a problem of the prior art, and in order to prevent a control signal from being transmitted from a speaker for alarm broadcasting in an alarm station of a discharge alarm system, Does not require a delay circuit in the voice line, and therefore does not cause the above problems,
It is intended to provide a discharge warning system.

[0018]

FIG. 1 shows the basic configuration of the present invention. According to the present invention, the control and monitoring station 1 is provided with a voice signal transmitting means 2, and a voice signal and a control signal for turning on / off the power of the voice amplifier 4 in the alarm station 3 for the voice signal are wirelessly transmitted in the same voice band. In the discharge alarm system for transmitting to the alarm station 3 via a line, the control and monitoring station 1 is provided with a control signal transmitting means 5 for converting the control signal into a modulated signal arranged at the end of the voice band and transmitting the modulated signal. A bandpass filter 6 for selectively extracting the modulated signal to the alarm station 3, and a control signal receiving means 7 for demodulating the extracted signal and receiving a control signal.
And a low-pass filter 8 that cuts off the modulated signal and inputs only the audio signal to the audio amplifier 4, and the power of the audio amplifier 4 is turned on and off by the received control signal.

[0019]

In the discharge warning system of the present invention, the control and monitoring station 1 is provided with the voice signal transmitting means 2 for turning on / off the voice signal and the power of the voice amplifier 4 in the alarm station 3 for the voice signal. The control signal is transmitted to the alarm station 3 via the wireless line in the same voice band.

In such a discharge warning system, the control and monitoring station 1 is provided with a control signal transmitting means 5 for converting this control signal into a modulation signal arranged at the end of the voice band and transmitting it.

Further, the alarm station 3 is provided with a bandpass filter 6
Is provided to selectively extract the modulated signal, the control signal receiving means 7 is provided to demodulate the extracted signal to receive the control signal, and the low pass filter 8 is provided to block the modulated signal. Then, only the audio signal is input to the audio amplifier 4.

The audio amplifier 4 is controlled by this control signal.
Since the power source of the alarm broadcasting system is turned on and off, it is possible to prevent the audio frequency signal corresponding to the control signal from being output as an unnecessary sound from the alarm broadcasting speaker in the alarm station of the discharge alarm system.

[0023]

Embodiments of the present invention will be described below with reference to FIGS. FIG. 2 shows a configuration example of the control and monitoring device according to the present invention. The same components as those in FIG. 6 are designated by the same reference numerals, and the description thereof will be omitted. A transmission control unit (1) 35A controls the transmission of a main control signal related to the siren sound and the like with the operation display control unit 32.
A modulation / demodulation unit (1) 36A modulates and demodulates the main control signal with the line input / output unit 37. A transmission control unit (2) 35B controls transmission of the sub control signal with the call function control unit 34. A modulation / demodulation unit (2) 36B modulates and demodulates the sub control signal with the line input / output unit 37.

FIG. 3 shows an example of the configuration of the alarm device according to the present invention. The same components as those in FIG. 7 are designated by the same reference numerals, and the description thereof will be omitted. 42A is a modulator / demodulator
In (1), the main control signal is modulated and demodulated with the line input / output unit 41. A transmission control unit (1) 43A controls transmission of the main control signal with the siren control unit 44. A modulator / demodulator (2) 42B modulates and demodulates the sub control signal with the line input / output unit 41.
43B is a transmission control unit (2), which is a call function control unit 45.
And the transmission control of the sub-control signal.

A band pass filter (BP) 49 selectively passes only the sub control signal between the line input / output unit 41 and the modulator / demodulator (2) 42B. Reference numeral 50 is a low-pass filter (LP) that allows only a voice signal having a frequency equal to or lower than a specific cutoff frequency to pass between the line input / output unit 41 and the call function control unit 45 and cuts off the sub control signal.

At this time, the audio signal and each control signal are transmitted in the following form. When the voice band transmitted by the radio signal is, for example, 3.4 kHz, the voice signal is transmitted by FM-modulating the band of 0.3 to 2.5 kHz. The main control signal is transmitted in the band of 1700 ± 400 Hz by FS-modulating the subcarrier provided near the main carrier at 1200 bps. The subcarrier is also transmitted in the band of 2700 ± 50 Hz by FS modulation at 200 bps. The modulation method of the audio signal and each control signal is not limited to this case, and another method may be used.

FIG. 4 shows an operation sequence of the discharge warning system of the present invention. When the broadcast start signal is sent as a control signal from the control monitoring station (master station) at the time of broadcasting start, the alarm station (slave station) receives this signal to analyze the received information and display the analysis result. In response, the speaker power supply (audio output amplifier power supply) is turned on. In this state, when the master station broadcasts the release warning message by the microphone, the speaker output is immediately generated.

When the broadcast stop signal is sent from the master station as a control signal when the broadcast is stopped, the slave station receives this signal to analyze the received information, and the speaker power is turned off according to the analysis result. become. At this time, the modulated signal corresponding to the broadcast stop signal in the audio line is blocked by the low-pass filter, so that an unnecessary sound based on this is not transmitted from the speaker. Since the main control signal for controlling the sound of the siren and the like is transmitted after the end of broadcasting the audio signal, no unnecessary sound is generated by this.

As described above, in the present invention, the main control signal for controlling the sounding of the alarm siren, the activation of the alarm broadcast,
The sub control signal for controlling stop etc. is transmitted from the different transmission paths in the same voice band, and the alarm station selectively extracts the sub control signal to control ON / OFF of the audio amplifier power supply and Since the signal is separated from the sub-control signal and is output to drive the speaker, it is possible to prevent the audio frequency signal corresponding to the broadcast stop signal from being transmitted as a loud sound as an unnecessary sound.

[0030]

As described above, according to the present invention, in the discharge warning system, it is possible to effectively prevent the audio frequency signal corresponding to the broadcast stop signal from being output from the speaker as an unnecessary sound. Further, in this case, since a delay circuit is not required for the voice line, distortion of the speaker voice can be prevented and it is economically advantageous.

[Brief description of drawings]

FIG. 1 is a diagram showing a principle configuration of the present invention.

FIG. 2 is a diagram showing a configuration example of a control and monitoring device according to the present invention.

FIG. 3 is a diagram showing a configuration example of an alarm device according to the present invention.

FIG. 4 is a diagram showing an operation sequence of the discharge warning system of the present invention.

FIG. 5 is a diagram showing an overall configuration of a conventional release warning system to which the present invention is applied.

FIG. 6 is a diagram showing a configuration example of a conventional control and monitoring device.

FIG. 7 is a diagram showing a configuration example of a conventional alarm device.

FIG. 8 is a diagram showing an operation sequence of a conventional release warning system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 control monitoring station 2 audio signal transmitting means 3 alarm station 4 audio amplifier 5 control signal transmitting means 6 band pass filter 7 control signal receiving means 8 low pass filter

Claims (1)

[Claims] 1. A control monitoring station (1) is provided with a voice signal transmitting means (2) for turning on and off a voice signal and a power source of a voice amplifier (4) in an alarm station (3) for the voice signal. In a discharge alarm system for transmitting a control signal to the alarm station (3) via a wireless line in the same voice band, the control monitoring station (1) provides the control signal to the modulation signal arranged at the end of the voice band. A control signal transmitting means (5) for converting to and transmitting the signal is provided, and the alarm station (3) is provided with a bandpass filter (6) for selectively extracting the modulated signal, and demodulating the extracted signal. Control signal receiving means (7) for receiving the control signal
A low-pass filter (8) for cutting off the modulation signal and inputting only a voice signal to the voice amplifier (4) is provided, and the power source of the voice amplifier (4) is turned on and off according to the received control signal. Discharge warning system characterized by having done.