JPH11343616A - Discharge warning system and discharge warning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a discharge warning system and a discharge warning device, in the discharge warning system in which a control monitor station brings a plurality of warning stations under control, which is provided with a leakage sound broadcasting preventive function due to the transmission of the broadcasting starting signal to the other warning station after the warning station receives successively broadcast starting signals under a control mode. SOLUTION: After the output control part 2r of a warning device 20 of respective warning stations receives successively broadcast starting signals under a control mode via a demodulating circuit of a modulating and demodulating part 2c a speaker on/off control signal of a line-on level is output to an amplitude starting control part 2s by receiving the broadcast starting signal. Thus, the amplitude starting control part 2s opens the signal input terminal of a voice amplifier 2i from the earth (ground) level to connect it to the broadcast signal output terminal of a warning control path 2h, and releases the operation inhibiting condition of the voice amplifier 2i to bring the output operation of a speacker 2j into an enabling condition (broadcast enabling condition).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge warning device applied to the system. Further, the present invention provides a discharge with a function of preventing sound leakage when transmitting a broadcast start signal under a sequential control mode such as an all-stations sequential control mode, a block sequential control mode, a timer sequential control mode, or a block timer sequential control mode. The present invention relates to an alarm system and a discharge alarm device applied to the system.

[0002]

2. Description of the Related Art The configuration of a discharge warning system installed for managing rivers and dams will be described with reference to FIGS. FIG. 6 is a block diagram showing the configuration of a discharge warning system according to the Ministry of Construction, which is the subject of the present invention. FIG. 7 is a discharge warning handled by a control monitoring device of a control monitoring station which is one component of the discharge warning system. It is a figure showing the example of a screen composition of a water system chart.

In FIG. 6, a control monitoring station 1 calls and controls a speaker alarm station 2 (A) and a siren alarm station 2 (B) to generate pseudo sound, siren, sound broadcasting, and the like. Perform the operation. Further, the operation status of the alarm station 2 is printed and displayed based on a return signal returned from the alarm station 2 that has received the call control.

[0004] The speaker alarm station 2 (A) is provided with a pseudo sound blowing,
And operation such as audio broadcasting, and the operation status is returned to the control monitoring station 1. The audio broadcast at this time includes a microphone broadcast from the control and monitoring station 1, a broadcast due to generation of a master station voice, a broadcast due to generation of a slave station voice, and the like.

[0005] The siren alarm station 2 (B) is a control monitoring station 1
In accordance with the call control from, operations such as siren sounding, pseudo sounding, and sound broadcasting are performed, and the operation status is returned to the control monitoring station 1.

In a system configuration in which a relay station 3 of a radio line is interposed in a transmission path between the control monitoring station 1 and the alarm stations 2, 2,... ..., the relay station 3 is automatically activated, and after the control of the last relay station 3 using the same relay station is completed, the relay operation is terminated.

The radio transmission between the control monitoring station 1 and the alarm stations 2, 2,... (Including the case where the relay station 3 is interposed) is performed by a 70 MHz band radio apparatus of the Ministry of Construction or a 400 MHZ band of the Ministry of Construction.
A band wireless device (wireless device in the figure) is used.

The control and monitoring station 1 includes a plurality of alarm stations 2, 2,.
Control of the discharge alarm simultaneously or in accordance with a predetermined order. The control modes at this time include an all-stations sequential control mode, a block sequential control mode, a timer sequential control mode, a block timer sequential control mode, an all-stations simultaneous control mode, a block simultaneous control mode, and the like.

The all-stations sequential control mode includes all the alarm stations 2, 2,
.. Are not provided with an inter-station timer and are controlled according to a predetermined order. The block sequential control mode is a system in which all the alarm stations 2, 2,... Are divided into a plurality of blocks, and the blocks are controlled according to a predetermined order without providing an inter-station timer. The timer sequential control mode is a method of controlling all alarm stations 2, 2,... According to a set time of an inter-station timer according to a predetermined order.
The block timer sequential control mode is for all alarm stations 2, 2,
Are divided into a plurality of blocks, and the inside of the blocks is controlled in accordance with a set time of an inter-station timer and in a predetermined order. The simultaneous control mode for all stations is
2,... Are controlled simultaneously. The block simultaneous control mode is a method in which all the alarm stations 2, 2,... Are divided into a plurality of blocks, and the inside of the blocks is controlled simultaneously. In each of the above sequential control modes, a confirmation operation by a return signal accompanies every sequential control of each alarm station.

The alarm operation under the control of the control monitoring station 1 includes sound broadcasting such as microphone broadcasting in addition to siren and siren pseudo sound. When audio broadcasting control is performed by a microphone or the like, chime sound broadcasting is automatically performed for about 5 seconds, and thereafter, audio transmitted from the control monitoring station 1 is broadcast. After the end of the broadcast, the chime sound for about 5 seconds is automatically broadcast by the broadcast stop control from the control monitoring station 1, and then the broadcast operation ends.

Each of the alarm stations 2, 2,... Transmits a return signal indicating the operation content of its own alarm station 2 under the control of the control monitoring station 1. For example, under the above-described sequential control modes, a broadcast start signal is sequentially transmitted from the control monitoring station 1 to each of the alarm stations 2, 2,.
When each of the alarm stations 2, 2,... Receives the broadcast start signal, it activates an amplifier to drive the speaker, and returns a return signal to the control monitoring station 1.

The return signal at this time includes an audible sound, an operation confirmation signal, an alarm station status signal, and the like. That is, when the siren or siren pseudo sound is controlled,
The siren sound or the pseudo sound is collected and returned for about 5 seconds. Subsequently, an operation confirmation signal indicating a siren sounding, a pseudo sounding sound, and the like, an alarm station state signal, and the like are returned.

When the sound broadcast control is performed by a microphone or the like, a chime sound is broadcast for about 5 seconds, and the chime sound is collected and returned. Subsequently, an operation confirmation signal indicating activation of the audio amplifier, an alarm station status signal, and the like are returned.

When the broadcast stop control is performed, the chime sound is broadcast for about 5 seconds, and the chime sound is collected and returned. Subsequently, an operation confirmation signal indicating the stop of the audio amplifier, an alarm station status signal, and the like are returned.

In addition to the above-described processing functions, there are processing functions such as inspection, monitoring, and printing, but the description thereof is omitted here. In the discharge alarm system having the above-described configuration, conventionally, at the time of starting operation by the sequential control of the alarm stations 2, 2,..., The leakage noise accompanying the transmission of the audible sound signal from the activated alarm station. (Sound leakage) occurs.

That is, the control / monitoring station 1 controls each of the alarm stations 2, 2,... Under control by using the all-stations sequential control mode, the block sequential control mode, the timer sequential control mode, or the block timer sequential control mode. When the control of the release alarm broadcast is sequentially performed from the first alarm station 2 to the last alarm station 2 during the control period, the alarm station 2 which has been activated from the alarm station 2 which has been activated during the control period, The control signal (including the return signal) is broadcast as leakage noise (sound leakage).

FIG. 8 shows the generation timing of the leakage noise (sound leakage) at this time. Here, prior to the release warning broadcast, a broadcast start signal is sequentially transmitted to each of the warning stations (station A → station B → station C...) In the predetermined sequential control mode as described above. When starting the broadcast output amplifier of each alarm station (station A → station B → station C...), From the alarm station (eg, station A) which has been started,
The audible frequency signal accompanying the broadcast start (including the return signal) of the alarm station (station B → station C...) That starts thereafter leaks and is broadcast as noise (sound leakage). This noise (sound leakage) is transmitted as noise to the surrounding residents every time not only during the discharge warning broadcast but also at the time of checking and confirming the discharge warning operation.

[0018]

As described above, conventionally, the control and monitoring station operates in a sequential control mode such as an all-stations sequential control mode, a block sequential control mode, a timer sequential control mode, or a block timer sequential control mode. When sequentially controlling the discharge alarm broadcast from the first alarm station to the last alarm station for each alarm station under control, during the control period, from the activated alarm station,
After that, the control signal of the alarm station that starts up is broadcast as leakage noise (sound leakage), and when checking and confirming the release alarm operation,
Each time, there is an inconvenience that the noise is transmitted to the surrounding residents.

The present invention has been made in view of the above circumstances,
In a discharge alarm system in which one control monitoring station controls a plurality of alarm stations, the alarm station sequentially receives a broadcast start signal in a control mode and transmits a broadcast start signal to another alarm station. An object of the present invention is to provide a discharge alarm system and a discharge alarm device having a function of preventing sound leakage broadcasting.

[0020]

According to the present invention, there is provided a discharge alarm system in which one control monitoring station controls a plurality of alarm stations.
In the predetermined sequential control mode, the above-mentioned alarm stations are sequentially broadcast-started, and after all the alarm stations under control are broadcast-started, a means for simultaneously transmitting a specific control signal to each of the alarm stations is provided, The alarm station is provided with means for receiving the specific control signal and making the amplifier of the speaker operable after the broadcast is started, and each of the alarm stations sequentially receives the broadcast start signal under the control mode and receives another signal. It is characterized in that noise (sound leakage) output from a speaker due to transmission of a broadcast start signal to an alarm station is prevented.

According to the above configuration, after starting the broadcast to all the alarm stations, the amplifiers of the respective alarm stations are enabled to operate, so that each of the alarm stations sequentially receives the broadcast start signal under the control mode. It is possible to reliably prevent noise (sound leakage) broadcast from a speaker accompanying transmission of a broadcast start signal to another alarm station later.

Further, according to the present invention, in a discharge alarm device of an alarm station applied to a discharge alarm system, after receiving a broadcast start signal in a predetermined sequential control mode, a specific control signal (speaker line on) is simultaneously controlled. Signal), and a means for enabling an amplifier (audio amplifier) of the speaker to be operable by receiving the signal.

According to the above configuration, the amplifier for driving the speaker does not reach the operable state only by receiving the broadcast start signal in the sequential control mode, and the speaker line is turned on after the broadcast start signal is transmitted to all alarm stations. Since the amplifier enters the operable state for the first time after receiving the signal, the noise (sound leakage) from the speaker accompanying the transmission of the broadcast start signal to another alarm station after receiving the broadcast start signal in the sequential control mode ) Broadcasting can be reliably prevented.

According to the present invention, there is provided a discharge alarm device of an alarm station applied to a discharge alarm system, wherein the signal is generated when a broadcast start signal included in a signal received from the control monitoring station is sequentially transmitted under a sequential control mode. A filter for removing a signal component of a specific audible frequency band corresponding to the audible frequency (a sound leakage signal component at the time of sequentially transmitting the broadcast start signal) is provided on the broadcast signal path.

According to the above arrangement, only the audible sound signal component (sound leakage signal component) of the control signal (including the return signal) in the sequential transmission of the broadcast start signal in the sequential control mode is cut by the filter. In addition, it is possible to reliably prevent noise (sound leakage) broadcast from a speaker accompanying transmission of the broadcast start signal to another alarm station after receiving the broadcast start signal in the sequential control mode, and to reduce the frequency of the received broadcast start signal. Reliable warning broadcasting according to the signal can be performed.

According to the present invention, in a discharge alarm device of an alarm station applied to a discharge alarm system, a delay means for delaying a signal received from the control monitoring station for a predetermined time, and a delay time within a delay time of the delay means. Determining means for determining whether the signal received from the control monitoring station is a broadcast signal and outputting a broadcast prohibition control signal when the signal is not a broadcast signal; anda broadcast prohibition control signal output from the determination means. Alarm control means for controlling the output of the alarm broadcast.

According to the above arrangement, while the reception signal is delayed by the delay means, the reception signal is determined by the determination means and only the unnecessary signal (sound leakage signal) is cut off, so that the broadcast start signal by sequential control is obtained. Noise (leakage sound) broadcasting during transmission of the data can be prevented. That is, at the time of receiving a control system signal at the time of transmitting a broadcast start signal or the like in the sequential control mode, the operation of the audio amplifier driving the speaker is prohibited by the broadcast inhibition control signal, and the broadcast signal is received. At this time, since the warning broadcast according to the broadcast signal is performed with a delay corresponding to the time required for the determination processing, the broadcast start signal is transmitted to another warning station after receiving the broadcast start signal in the sequential control mode. Noise from speakers due to noise
Broadcasting can be reliably prevented, and a reliable alarm broadcast according to the broadcast signal can be performed without any loss of the received broadcast signal.

[0028]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the overall configuration of a discharge alarm device provided in each alarm station of the discharge alarm system according to the first embodiment of the present invention.

In FIG. 1, reference numeral 20 denotes an alarm device provided in an alarm station of the discharge alarm system, which corresponds to a speaker alarm device (or a siren alarm device) shown in FIG. 6 on the system.

Reference numeral 2a denotes a basic control unit which controls the entire discharge alarm device, and performs input / output control of each input / output control unit, determination of a received code, and the like. Various control signals including a broadcast start signal, a return signal accompanied by an audible sound, an alarm broadcast signal, monitoring information, etc., with a control monitoring station (corresponding to the control monitoring station 1 shown in FIG. 6) via a wireless device. Exchange.

2b is under the control of the basic control unit 2a,
It is a wireless device for transmitting and receiving the various kinds of information as described above to and from the control monitoring station, and is configured by a 70 MHz band wireless device of the Ministry of Construction or a 400 MHz wireless device of the Ministry of Construction.

Reference numeral 2c denotes a modulation / demodulation unit connected to the radio apparatus 2b, which includes a modulation circuit for converting a pulse code into a frequency modulation signal, a demodulation circuit for converting a frequency modulation signal into a pulse code, and the like.

Reference numeral 2d denotes a transmission control unit interposed between the bus connected to the basic control unit 2a and the wireless device 2b, which manages a data transmission procedure between the control and monitoring device of the control and monitoring station, It performs code transmission / reception control.

Reference numeral 2e denotes a sound collecting and returning unit, and an alarm control unit 2h
Under the control of, the function of returning the audible sound for about 5 seconds after the start and the return of the output audio signal collected by the sound collecting microphone 2f. If there are a plurality of sound collecting microphones, the sound signal collected by using any one of them is returned.

Reference numeral 2f denotes a sound-collecting microphone which collects chime broadcasts output from the speaker 2j and warning broadcasts such as siren pseudo-sounds, and outputs them to the sound-collecting return unit 2e.
2g is a sound collection level determination unit, and the sound collection microphone 2
The level of the sound collected at f is determined. In this case, the target of sound collection is a siren pseudo sound, a chime sound, a broadcast sound, and the like. These level determinations are performed based on preset values including a sound pressure level, a sounding pattern accuracy, and the like.

Reference numeral 2h denotes an alarm control unit, which is a basic control unit 2a.
Under the above control, siren pseudo sound control and broadcast control are performed. Here, on the signal transmission path between the audio amplifier 2i and the broadcast start in the sequential control mode, until the broadcast start signal is sent to all the alarm stations controlled by the same control monitoring station. , The signal input to the audio amplifier 2i is cut off, and the broadcast output from the speaker 2j is prohibited.

An audio amplifier (amplifier) 2i inputs an alarm broadcast signal such as a siren pseudo sound, a chime sound, and a broadcast sound output from the alarm control section 2h, amplifies the power, and drives the speaker 2j.

2j follows the output signal of the audio amplifier 2i,
A loudspeaker (loudspeaker) for outputting warning broadcasts such as siren pseudo sound, chime sound, and broadcast sound to a predetermined area. Here, it is a two- to four-way type, and is 1 meter on the front axis at an input of 1 watt. A structure having an output sound pressure characteristic capable of ensuring a sound pressure of 104 decibels (dB) or more at the point (1) is used.

Reference numeral 2k denotes a chime sound output unit, which outputs (broadcasts) a predetermined unit time before starting the broadcast after starting the broadcast and after ending the broadcast. The chime sound at this time is a four-stroke sound by an electronic sound (a do-me-sound (high) and a do-so-sound).
(Mead).

Reference numeral 2p denotes an impedance determination unit which measures the impedance of the speaker 2j during inspection control and determines whether or not a predetermined standard (normal impedance range, sound detection frequency, etc.) is satisfied.

Reference numeral 2q denotes a sound generator, which stores broadcast contents in a memory, like a tape, and is read out and broadcasted by a start command. Here, a configuration is adopted in which the broadcast content can be added up to a maximum of three items within one minute of one item.

Reference numeral 2r denotes an output control unit for regulating the output of the speaker 2j at the time of starting the broadcast of the warning broadcast. The control monitoring station issues an all station sequential control mode, block sequential control mode, timer sequential control mode, or block timer sequential mode. When a broadcast start signal is received in a sequential control mode such as a control mode, a specific simultaneous control signal (speaker line ON signal; simultaneous line O in FIG.
N signal) (see FIG. 3), a speaker line on / off control signal (FIG.
(See (h)).

Reference numeral 2s denotes an amplifier start-up control unit for starting and controlling the audio amplifier 2i in response to the above-mentioned speaker line on / off control signal (see FIG. 3 (h)). Until the ON state, the signal input terminal of the audio amplifier 2i is disconnected from the broadcast signal output terminal of the alarm control unit 2h, and the output of the audio amplifier 2i is suppressed by lowering to the ground level.

Here, the input control terminal of the audio amplifier 2i is cut off from the broadcast signal output terminal of the alarm control unit 2h, and the output of the audio amplifier 2i is suppressed by lowering the input terminal to the ground level. However, the present invention is not limited to this. For example, a means for controlling the gain of the audio amplifier 2i, a means for controlling the operating power supply of the audio amplifier 2i, a means for switching the speaker / impedance element on the output side of the audio amplifier, and other amplifier activation control It is also feasible by means.

FIG. 2 is a block diagram showing a configuration of a main part of the above-mentioned discharge warning device 20 according to the first embodiment of the present invention. Here, the same parts as those in FIG. Omitted.

FIG. 3 is a time chart for explaining the operation of the first embodiment. In the first embodiment, the control monitoring station (see reference numeral 1 in FIG. 6) performs the all station sequential control mode, the block sequential control mode, the timer sequential control mode, or the block timer sequential control when starting the release warning broadcast. In a predetermined sequential control mode such as a mode, each alarm station (see reference numeral 2 in FIG. 6) to be controlled
As shown in (a) to (d), broadcast activation is sequentially performed,
After broadcasting all the alarm stations (stations A to N in FIG. 3) which are to be controlled, the speaker lines shown in FIG. 3 (e) are simultaneously controlled by the respective alarm stations (stations A to N). An ON signal (simultaneous line ON signal) is transmitted.

The alarm device 20 of each of the alarm stations (A to N stations)
Receives the broadcast start signal under the sequential control mode,
The audio amplifier 2i is activated, but until the speaker line on signal (simultaneous line ON signal) is received from the control monitoring station, the signal input terminal of the audio amplifier 2i is connected to the alarm controller 2h.
3e, the speaker 2j is disconnected from the broadcast signal output terminal and is in a state in which operation is prohibited due to the ground level, and the speaker 2j is in a silent state (non-drive state).
Speaker line on signal (broad line ON signal)
, The speaker 2j becomes operable for the first time.
At this time, the speaker line on signal (simultaneous line ON signal) received from the control monitoring station is input to the output control unit 2r via the demodulation circuit of the modulation and demodulation unit 2c. 2s, a line-on-level speaker line on / off control signal is output as shown in FIG.
s releases the signal input terminal of the audio amplifier 2i from the ground level, connects the signal input terminal of the alarm control unit 2h to the broadcast signal output terminal, and releases the operation inhibition state of the audio amplifier 2i.
State in which output operation of speaker 2j is possible (broadcastable state)
Becomes

Here, the operation in the first embodiment of the present invention will be described with reference to FIGS. In the discharge warning system having the configuration shown in FIG. 6, the control monitoring device of the control monitoring station (see reference numeral 1 in FIG. 6) performs the warning of each warning station placed under control prior to the warning broadcast. As shown in FIG. 3A, a broadcast start signal is sequentially transmitted to the device 20 in a predetermined order.

When the alarm devices 20 of the respective alarm stations that have received the broadcast start signal sequentially receive the broadcast start signal under the control mode, according to the signal, as shown in FIGS. The activation of the amplifier 2i is controlled. At the time of this broadcast start control, the output control unit 2r still outputs the speaker line ON signal (simultaneous line ON signal) via the modem unit 2c.
Since the signal has not been received, the signal input terminal of the audio amplifier 2i is disconnected from the broadcast signal output terminal of the alarm control unit 2h, and the audio amplifier 2i is set to the ground (ground) level, so that the operation of the audio amplifier 2i is prohibited. Therefore, the speaker 2j does not operate and is in a silent state (non-drive state).

At the time of the broadcast start control, the start of the alarm station (for example, the station A) is accompanied by the start of the broadcast of the alarm station (the station B → the station C...) (Including the return signal) which is started thereafter. Although the audible frequency signal leaks and is conventionally broadcast as noise (sound leakage), in this embodiment, the signal input terminal of the audio amplifier 2i is connected to the broadcast of the alarm control unit 2h during the broadcast start control as described above. Disconnected from the signal output end for
Since the audio amplifier 2i is at the ground (ground) level, the operation of the audio amplifier 2i is in the disabled state, and the speaker 2j is in the silent state (non-drive state), the above-mentioned noise (sound leakage) broadcast is avoided.

The control monitoring device of the control monitoring station (reference numeral 1 in FIG. 6)
3) transmits a broadcast start signal sequentially to the alarm devices 20 of all the alarm stations placed under the control object, and then simultaneously transmits the alarm stations to the respective alarm stations as shown in FIG. Transmits the speaker line ON signal (simultaneous line ON signal).

Output control unit 2r of alarm device 20 of each alarm station
Receives a broadcast start signal through the demodulation circuit of the modulation / demodulation unit 2c in a sequential control mode, and then receives a broadcast start signal.
As shown in FIG. 3 (h), a speaker line on / off control signal of a line on level is output to the amplifier activation control unit 2s. Thus, the amplifier activation control unit 2s releases the signal input terminal of the audio amplifier 2i from the ground level, connects the signal input terminal of the alarm control unit 2h to the broadcast signal output terminal, and releases the operation inhibition state of the audio amplifier 2i. , The output operation of the speaker 2j is enabled (broadcastable state).

The control monitoring device of the control monitoring station (reference numeral 1 in FIG. 6)
) Simultaneously transmits a speaker line ON signal (simultaneous line ON signal) to the alarm devices 20 of all the alarm stations placed under the control object, and then, as in the existing system, the above alarm stations. , An audio signal of the release alarm broadcast is transmitted to the alarm device 20 at the same time, and thereafter, a broadcast stop signal is transmitted.

When the alarm control unit 2h provided in the alarm device 20 of each alarm station receives the audio signal of the above-mentioned warning alarm broadcast through the demodulation circuit of the modulation / demodulation unit 2c, the alarm control unit 2s converts the audio signal into an amplifier activation control unit 2s. Via the audio amplifier 2i.

The audio amplifier 2i power-amplifies the audio signal of the release alarm broadcast input from the alarm control unit 2h, and amplifies the speaker 2j.
To broadcast a discharge warning from the speaker 2j. As described above, according to the broadcast activation control according to the first embodiment of the present invention, after the broadcast activation is applied to the alarm devices 20 of all the alarm stations, the audio amplifiers (amplifiers) provided in the alarm devices 20 of the respective alarm stations are provided. 2) Since 2i is activated, each alarm station sequentially receives a broadcast activation signal under the control mode, and after that, reliably transmits a noise (sound leakage) broadcast from the speaker 2j accompanying transmission of the broadcast activation signal to another alarm station. Can be prevented.

Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 4 is a block diagram showing a configuration of a main part of a discharge warning device 20 according to a second embodiment of the present invention. Here, the same portions as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

In the second embodiment, the broadcast start signal under the sequential control mode, which is included in the reception signal, is provided on an alarm output circuit that drives the speaker 2j of each alarm station under the control of the control monitoring station. The broadcast start control of the control monitoring station is performed by removing a signal component of a specific audio frequency band corresponding to an audio frequency generated at the time of sequential transmission, that is, through a filter for removing a sound leakage signal component at the time of sequentially transmitting the broadcast start signal. In the existing configuration, noise (sound leakage) broadcast from the speaker 2j due to transmission of a broadcast start signal during broadcast start control is prevented.

In FIG. 4, reference numeral 2m denotes a reception control unit for controlling the alarm control unit 2h based on a control signal received from the control monitoring station. 2n is a filter circuit for removing a signal component in a specific audible frequency band corresponding to an audible frequency generated at the time of sequentially transmitting the broadcast start signal under the sequential control mode. The sound leakage signal component at the time of sequentially transmitting the broadcast start signal of the broadcast signal input to the section 2h is removed.

In the above configuration, the control and monitoring device of the control and monitoring station (see reference numeral 1 in FIG. 6) performs a predetermined operation on the alarm device 20 of each of the alarm stations placed under control prior to the warning broadcast. The broadcast start signal is transmitted in order.

When the reception control section 2m provided in the alarm device 20 of each alarm station receives a broadcast start signal in a predetermined sequential control mode via the demodulation circuit of the modulation / demodulation section 2c, the reception control section 2m outputs a voice signal via the alarm control section 2h. The activation of the amplifier 2i is controlled.

At the time of the broadcast start control, the start of the alarm station (for example, station A) is accompanied by the start of the broadcast of the alarm station (station B → station C...) (Including the return signal) which is started thereafter. The audible frequency signal leaks and is conventionally broadcast as noise (sound leakage), but in this embodiment, a filter circuit 2n is interposed in front of the alarm control unit 2h, and the alarm control unit is controlled by the filter circuit 2n. The sound leakage signal component during the sequential transmission of the broadcast start signal included in the broadcast signal input to 2h is cut.

As a result, from the signal input to the audio amplifier 2i, only the signal component of the specific audible frequency band corresponding to the audible frequency generated at the time of sequentially transmitting the broadcast start signal in the sequential control mode is removed. Alarm broadcasting without noise (sound leakage) due to the leakage of the sound.

Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 5 is a block diagram showing a configuration of a main part of a discharge warning device 20 according to a third embodiment of the present invention. Here, the same parts as those in FIG.

In the third embodiment, a delay circuit for delaying a signal received from a control monitoring station for a predetermined time, and whether a signal received from the control monitoring station within a delay time of the delay circuit is a broadcast signal or not. A determination circuit that determines whether or not the signal is a broadcast signal and outputs a broadcast prohibition control signal when the signal is not a broadcast signal; and an alarm control unit that controls output of an alarm broadcast based on the broadcast prohibition control signal output from the determination circuit. While the delay circuit delays the received signal, the determination circuit determines the received signal,
By cutting only unnecessary signals (sound leakage signals), noise (sound leakage) broadcasting at the time of transmitting a broadcast start signal by sequential control is prevented. That is, at the time of receiving a control system signal at the time of transmitting a broadcast start signal or the like in the sequential control mode, the operation of the audio amplifier driving the speaker is prohibited by the broadcast inhibition control signal, and the broadcast signal is received. At this time, since the warning broadcast according to the broadcast signal is performed with a delay corresponding to the time required for the determination processing, the broadcast start signal is transmitted to another warning station after receiving the broadcast start signal in the sequential control mode. This makes it possible to reliably prevent noise (sound leakage) broadcasting from a speaker, and to ensure that a received broadcast signal is not lost, and that a reliable alarm broadcast according to the broadcast signal can be performed.

In FIG. 5, reference numeral 2u denotes a judgment circuit for judging whether or not the signal received from the control monitoring station is a broadcast signal. When the signal is not a broadcast signal, a broadcast inhibition control signal is sent to the alarm control section 2h. Send out.

Reference numeral 2v denotes a delay circuit provided before the alarm control unit 2h, which delays the broadcast signal input to the alarm control unit 2h by the time required for the judgment operation of the judgment circuit 2u.
In the above configuration, the control and monitoring device of the control and monitoring station (see reference numeral 1 in FIG. 6) performs, in a predetermined order, the alarm devices 20 of the respective alarm stations placed under the control target before the warning broadcast. The broadcast start signal is transmitted sequentially.

When the reception control unit 2m provided in the alarm device 20 of each alarm station receives a broadcast start signal in a predetermined sequential control mode via the demodulation circuit of the modulation / demodulation unit 2c, the reception control unit 2m outputs a sound via the alarm control unit 2h. The activation of the amplifier 2i is controlled.

At the time of the broadcast activation control, the activated alarm station (for example, station A) is accompanied by the broadcast activation (including the return signal) of the subsequently activated alarm station (station B → station C...). The audible frequency signal leaks and is conventionally broadcast as noise (sound leakage). In this embodiment, however, the delay circuit 2
While the received signal is delayed by v, the received signal is determined by the determination circuit 2u, and based on the determined signal, the alarm control unit 2h cuts only the unnecessary signal (sound leakage signal). This allows
Noise (sound leakage) broadcasting during transmission of the broadcast start signal by the sequential control is prevented, and correct alarm broadcasting without omission is performed.

[0069]

As described above in detail, according to the present invention, 1
In a discharge alarm system in which a control monitoring station places a plurality of alarm stations under control, after an alarm station receives a broadcast start signal in a sequential control mode, a leakage associated with transmission of a broadcast start signal to another alarm station is performed. Discharge alarm system with a function to prevent sound broadcasting,
And a discharge alarm device.

That is, according to the present invention, in a discharge warning system in which one control monitoring station controls a plurality of warning stations,
At the start of the discharge warning broadcast, the control monitoring station sequentially activates the above-mentioned alarm stations in a predetermined sequential control mode, and after broadcasting all the alarm stations under control, starts the respective broadcast stations. Means for simultaneously transmitting a specific control signal to the alarm station; and, after the broadcast is started, the alarm station is provided with a means for receiving the specific control signal to make the speaker amplifier operable. After the broadcast start signal is received in the control mode, noise (sound leakage) output from the speaker due to transmission of the broadcast start signal to other alarm stations is prevented, so that all alarm stations start broadcasting. , The amplifier of each alarm station becomes operable, so that each alarm station sequentially receives a broadcast start signal under the control mode and then transmits the broadcast start signal to another alarm station. Noise (sound leakage) broadcast from It is possible to prevent.

According to the present invention, in a discharge alarm device of an alarm station applied to a discharge alarm system, after receiving a broadcast start signal in a predetermined sequential control mode, a specific control signal (speaker (A line-on signal) to receive the broadcast start signal in the sequential control mode, thereby driving the speaker. Since the amplifier does not reach the operable state and the speaker line on signal after the broadcast start signal has been sent to all alarm stations is received and the amplifier enters the operable state for the first time, broadcasting starts in the control mode sequentially. After receiving the signal, it is possible to reliably prevent noise (sound leakage) broadcast from the speaker accompanying transmission of the broadcast start signal to another alarm station.

According to the present invention, in a discharge alarm device of an alarm station applied to a discharge alarm system, a broadcast start signal is sequentially transmitted under a sequential control mode, which is included in a signal received from the control monitoring station. A filter that removes a signal component of a specific audible frequency band corresponding to an audible frequency generated at the time (a sound leakage signal component when a broadcast start signal is sequentially transmitted) is interposed in a broadcast signal path for driving a speaker. With this, only the audible sound signal component (sound leak signal component) of the control signal (including the return signal) during the sequential transmission of the broadcast start signal in the sequential control mode is cut by the filter, and the broadcast start in the sequential control mode Noise from the speaker due to transmission of the broadcast start signal to other alarm stations after receiving the signal (sound leakage)
Broadcasting can be reliably prevented, and a reliable alarm broadcast according to the received broadcast signal can be performed.

According to the present invention, in a discharge alarm device of an alarm station applied to a discharge alarm system, delay means for delaying a signal received from the control monitoring station for a predetermined time,
Determining means for determining whether a signal received from the control monitoring station within the delay time of the delay means is a broadcast signal and outputting a broadcast inhibition control signal when the signal is not a broadcast signal; and And a warning control means for controlling the output of the warning broadcast based on the output of the broadcast prohibition control signal. Is determined, and only unnecessary signals (sound leakage signals) are cut, so that noise (sound leakage) broadcasting at the time of transmitting a broadcast start signal by sequential control can be prevented.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the overall configuration of a discharge alarm device provided in each alarm station of a discharge alarm system according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a main part of the discharge alarm device according to the first embodiment.

FIG. 3 is a time chart for explaining the operation of the first embodiment.

FIG. 4 is a block diagram showing a configuration of a main part of a discharge alarm device according to a second embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of a main part of a discharge alarm device according to a third embodiment of the present invention.

FIG. 6 is a block diagram showing a configuration of a discharge warning system targeted by the present invention.

FIG. 7 is a diagram showing a screen configuration example of a discharge alarm water diagram handled by a control monitoring device of a control monitoring station which is a component of the discharge alarm system shown in FIG. 6;

FIG. 8 is a diagram showing the generation timing of leakage noise (sound leakage) of the discharge warning system shown in FIG. 6;

[Explanation of symbols]

 Reference numeral 20: alarm device, 2a: basic control unit, 2b: wireless device, 2c: modulation / demodulation unit, 2d: transmission control unit, 2e: sound collection return unit, 2f: sound collection microphone, 2g: sound collection level determination unit, 2h ... Alarm control unit, 2i: audio amplifier (amplifier), 2j: speaker (loudspeaker), 2k: chime sound output unit, 2m: reception control unit, 2n: filter circuit, 2p: impedance determination unit, 2q: audio generation unit, 2r: output control unit, 2s: amplifier activation control unit, 2u: determination circuit, 2v: delay circuit.

Claims (4)

[Claims] In a discharge alarm system in which one control monitoring station controls a plurality of alarm stations, the control monitoring station transmits a signal to each of the alarm stations in a predetermined sequential control mode when starting a discharge alarm broadcast. A means for transmitting a broadcast activation signal sequentially and transmitting a broadcast activation signal to all alarm stations under control, and then transmitting a specific control signal to each of the alarm stations simultaneously, is provided in each of the alarm stations. A discharge warning system comprising: means for receiving a specific control signal after receiving a start signal, thereby enabling speaker driving. 2. A discharge alarm device for an alarm station applied to a discharge alarm system in which one control monitoring station places a plurality of alarm stations under control. Control means for prohibiting broadcast output when a broadcast start signal is received under a sequential control mode such as a mode, a timer sequential control mode, or a block timer sequential control mode, and subsequently receiving a specific simultaneous control signal from the control monitoring station. Discharge alarm device characterized by comprising: 3. A discharge alarm device of an alarm station applied to a discharge alarm system in which one control monitoring station controls a plurality of alarm stations, wherein the specific audible frequency included in a signal received from the control monitoring station. A filter for removing a signal component of a band is interposed in a broadcast signal path for driving a speaker, and the filter is used to remove a sound leakage signal when a broadcast start signal is sequentially transmitted in a sequential control mode. Discharge alarm device. 4. A discharge alarm device of an alarm station applied to a discharge alarm system in which one control monitoring station places a plurality of alarm stations under control, wherein a delay for delaying a signal received from the control monitoring station by a predetermined time. Means for determining whether the signal received from the control monitoring station is a broadcast signal within the delay time of the delay means, and outputting a broadcast inhibition control signal when the signal is not a broadcast signal; An emission control device comprising: output control means for controlling output of an alarm broadcast based on a broadcast prohibition control signal output from a determination means.