JP3142218B2 - Disaster prevention monitoring system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disaster prevention monitoring system, and more particularly, to connecting a communication device to a terminal device for disaster prevention and security including a disaster prevention receiver connected via a transmission line, thereby enabling communication between terminal devices. The present invention relates to a disaster prevention monitoring system capable of performing data transmission and voice communication.

[0002]

2. Description of the Related Art Disaster prevention monitoring systems are installed to prevent fires and theft in buildings, and as shown in FIG.
A disaster prevention receiver 1 (hereinafter, abbreviated as a receiver) is installed in a disaster prevention center of the building, and a distribution board 2, a repeater 3, a terminal 4 (a sensor, etc.), a display device 7, and the like are installed on each floor. The terminal device including the disaster prevention receiver 1 is connected via a line 5. In addition, the communication device 6 is attached to each terminal device 10 so that the user can directly talk with each site or disaster prevention center. In this case, for example, the line 5 connecting between the receiver 1 and the distribution board 2 is composed of two types of lines: a disaster prevention signal line 51 for digitally transmitting a disaster prevention signal such as a fire signal and a communication line 52 for analog transmission of a communication signal. It is configured.

[0003]

However, in such a conventional disaster prevention monitoring system, a disaster prevention signal line 5 is required.
The transmission line 1 and the communication line 52 are dedicated lines due to the difference in transmission systems, and even if one of them is disconnected, the function cannot be replaced by the other. Therefore, despite the fact that two lines are constructed, it is necessary to double wiring the disaster prevention signal line 51 because of the necessity of backup in case of disconnection. In this case, three lines must be drawn. There was a problem that the workability had to be turned very badly.

[0004] In many cases, it is necessary to install the track 5 outdoors in a large site, and in that case, it is necessary to take measures to prevent noise and lightning protection of the track 5. In such a case, transmission using an optical fiber is often performed as a countermeasure for this, but it is easy to convert the disaster prevention signal line 51 by digital transmission into an optical fiber, but the communication line 52 by analog transmission is optically transmitted. Fiber conversion was difficult. Further, even if both lines are made into optical fibers, it is necessary to add an optical link separately, and there is a problem that the cost is unavoidable.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to reduce the number of lines by digitizing an audio signal to improve workability and reduce costs.

[0006]

In order to solve the above-mentioned problems, according to the present invention, a plurality of terminal devices for disaster prevention and crime prevention are connected via a transmission line and provided on the terminal device. In a disaster prevention monitoring system that performs data transmission and voice communication between terminal devices by connecting the communication device to the communication circuit, the terminal device converts a voice signal input from the communication device into digital data via the communication circuit. An A / D converter for outputting digital data, a first-in-first-out memory for transmission which is connected to the A / D converter, stores digital data, and outputs previously stored data earlier than stored data. A RAM having a transmission buffer for temporarily storing data output from the first-in first-out memory and a reception buffer for temporarily storing audio data transmitted to the terminal device; A memory out reception first-in first outputting earlier than the data stored after the data stored previously stores the data of the reception buffer of the RAM,
A D / A converter for converting digital data in the first-in-first-out memory for reception into a voice signal and outputting the voice signal to the communication device via the communication circuit; A communication control unit for exchanging data, an A / D converter,
A central control unit for controlling voice communication by controlling a first-in first-out memory for reception and transmission, a RAM, a D / A converter, and a communication control unit is provided.

According to a second aspect of the present invention, the communication circuit transmits a communication device connection signal to the central control device when the communication device is connected to the communication circuit, and the central control device transmits the communication device connection signal. The voice communication control is performed only when the connection signal is received.

Further, according to the third aspect of the present invention, the central control unit assembles the data in the transmission buffer into a transmission packet and attaches an identifier indicating that the data is voice data to control the communication. , And the communication control unit attaches an address indicating the transmission source to the transmission packet and transmits the packet to the transmission path.

In addition, according to the present invention, the central control unit checks the identifier of the data received by the communication control unit, and receives the data when the identifier is an identifier indicating voice data. It is configured to send to the buffer.

According to a fifth aspect of the present invention, when data from a plurality of terminal devices are stored in the reception buffer of the RAM, the central control device adds the data from each terminal device. To the first-in first-out memory for reception.

[0011] On the other hand, according to the present invention, when the data from a predetermined number or more of the terminal devices is stored in the reception buffer of the RAM, the central control device receives the communication device connection signal. Regardless of the presence or absence, transmission of audio data from the terminal device is stopped.

[0012]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing an entire configuration of one embodiment of a disaster prevention monitoring system according to the present invention. In the present embodiment, the communication signal from the terminal device 10 is digitized to reduce the transmission line 5. This embodiment also has a configuration in which the terminal device 10 is connected via the line 5 as in the conventional system described above, but in this embodiment, the line 5 also serves as the disaster prevention signal line 51 and the communication line 52. And one transmission line 53. In this embodiment, the case where one transmission line 53 is used as the line 5 is shown for simplicity. However, as described above, two transmission lines 53 are actually provided for backup. .

Next, the terminal device 10 used in this embodiment will be described.
Will be described. FIG. 2 is a block diagram showing a configuration around the communication board 20. In the present embodiment, a receiver 1 and a distribution board 2 are assumed as the terminal apparatuses 10 having such a configuration, and a communication device 6 is attached to the receiver 1 and the distribution board 2 to perform a call between the terminal apparatuses 10. . Note that such a configuration is adopted for the repeater 3 and the display device 7, and the repeater 3
Needless to say, it is possible to make a call between the terminal devices 10 including the display device 7 and the display device 7. Hereinafter, the dispersion board 2 will be described as an example.

The distribution board 2 has another terminal device 10
A communication board 20 and a communication circuit 29 as shown in FIG. Then, by attaching the communication device 6 to the communication circuit 29, communication with another terminal device 10 is performed.

On the other hand, the communication board 20 has the following configuration. That is, the communication board 20 is first provided with a central control unit for controlling the communication board 20 and a CPU unit (hereinafter, CPU) 21 including its peripheral circuits. Next, this communication board 20
The A / D converter 22 converts an audio signal input from the communication device 6 into digital data through the A / D converter 9 and outputs the digital data, and conversely converts the digital data sent to the distribution board 2 into an audio signal. D / A converter 2 for outputting to communication circuit 29
3 are provided. In addition, A / D
A first-in-first-out memory for storing digital data sent from the converter 22 and digital data sent to the distribution board 2 and outputting previously stored data earlier than data stored later. (Hereinafter, FIFO memory)
24 are provided. In this case, the FIFO memory 24 is transmitted to the transmission FIFO memory (hereinafter referred to as transmission FIFO memory) 24 a which handles digital data sequentially transmitted from the A / D converter 22 and the distribution board 2. It comprises a first-in first-out memory for receiving digital data (hereinafter referred to as a FIFO memory for reception) 24b. Note that the FIFO memory is particularly used here because C
This is for collecting digital audio data in order to reduce the load on the PU 21, the A / D converter 22, and the D / A converter 23.

The FIFO memory 24 has a RAM
(Random access memory) 25 is connected. The RAM 25 has a transmission buffer 25 for temporarily storing data output from the transmission FIFO memory 24a.
a, and a receiving buffer 25b for temporarily storing audio data transmitted to the distribution board 2 is provided. Further, the RAM 25 is connected to the communication control unit 26 connected to the transmission line 53. The distribution board 2 exchanges data with another terminal device 10 via the communication control unit 26. On the other hand, the communication board 20 additionally includes the distribution board 2.
External I / F unit 2 for connecting the repeater 3 and the terminal 4 to the
And a ROM (Read Only Memory) 28 in which an application program for controlling the communication board 20 is stored.

Next, the operation of transmitting and receiving voice data according to this embodiment will be described. First, the transmission operation will be described. When a disaster such as a fire occurs and a clerk arrives at the site and connects the communication device 6 to the communication circuit 29 of the distribution board 2, the CP
A jack signal indicating that the communication device 6 has been connected to the distribution board 2 is input from the communication circuit 29 to U21. And
The CPU 21 receiving this jack signal instructs the A / D converter 22 to take in the audio signal. Here, the A / D converter 22 converts the analog audio data transmitted from the communication circuit 29 into digital data and outputs the digital audio data to the transmission FIFO memory 24a in synchronization with the sampling cycle generated by the CPU 21. The transmission FIFO memory 24a that has received the digital data stores the data and outputs a signal to notify the CPU 21 when the data is accumulated for one packet. Upon receiving this signal, the CPU 21 instructs the transmission FIFO memory 24a to transmit data to the transmission buffer 25a of the RAM 25. According to this command, the transmission FIFO memory 24a
The data stored earlier is output earlier than the data stored later, and the data is output to the transmission buffer 25a.

Here, the transmission buffer 25a has a configuration as shown in FIG. 3, and data sent from the transmission FIFO memory 24a is sequentially stored as data having a packet length of, for example, 100 ms.

On the other hand, the CPU 21 searches the transmission buffer 25a asynchronously with the above operation. Then, if there is data in the transmission buffer 25a, a transmission packet is assembled based on the data, and the transmission packet is attached to the communication control unit 26 with an identifier indicating that the data of the packet is audio data. The communication control unit 26 sends data to the transmission line 53 by attaching an address indicating the transmission source to the received packet. As a result, the voice data input from the communication device 6 is broadcast-transmitted to all terminals as digital data.

Next, the receiving operation will be described. CPU
Receives the jack signal from the communication circuit 29, and starts the receiving operation separately from the transmitting operation. That is, first, the CPU instructs the D / A converter 23 to capture an audio signal. On the other hand, when the communication control unit 26 receives a transmission packet from another terminal device 10, the communication control unit 26 issues a signal notifying the CPU 21 of the reception. Upon receiving this signal, the CPU 21 receives the packet and checks whether or not the identifier attached to the packet indicates audio data. If the identifier indicates audio data, only the audio data portion is extracted from the received packet,
In the receiving buffer 25b.

Here, the receiving buffer 25b is configured to be divided for each transmission source as shown in FIG. 4, and the received packet is stored for each transmission source based on the address attached thereto. . For example, data transmitted from a source A is stored in a buffer at address A in FIG.
-1, A-2... Are stored in this order.

On the other hand, the CPU 21 checks the remaining amount of data in the reception FIFO memory 24b asynchronously with the above operation. If the remaining amount is equal to or smaller than the fixed number of bytes and there is data in the reception buffer 25b, the reception buffer 2
5b from FIFO memory 24b
Transfer to At this time, when data is received from a plurality of transmission sources, one packet of data is taken out from the reception buffer 25b of each transmission source, and the data is added and transferred to the reception FIFO memory 24b. . Thus, audio data from a plurality of transmission sources are mixed, and audio from a plurality of locations can be simultaneously heard.
Then, the D / A converter 23 receives the FIFO memory 2 for reception.
From 4b, data is read one byte at a time according to the reproduction rate, converted into analog data, and output to the communication circuit 29.

On the other hand, the above-described mixing of voice data enables a simultaneous conversation between a large number of people, but on the other hand, if there are many speakers, the voice may be complicated and the conversation may be difficult. Therefore, in the present invention, the number of data sources stored in the reception buffer 25b is checked, and if the number is more than a certain number, the transmission of voice data is stopped to thereby reduce the number of speakers who can talk at the same time. Is restricted. That is, in this embodiment, the CPU
21 checks the number of transmission sources of the data stored in the reception buffer 25b. Receive buffer 25b
As shown in FIG. 4, since data is stored based on the address of the transmission source, by confirming whether or not data is stored in each buffer, audio data can be transmitted from any number of terminal devices. Can be confirmed whether or not is sent.

Then, for example, when a three-party call is permitted,
When it is confirmed that data from three or more transmission sources are stored in the reception buffer 25b, the CPU 21 performs the above-described transmission operation even if a jack signal from the communication circuit 29 is received. Stop and stop transmitting from the terminal device. In this case, the reception operation is performed normally without stopping, so that there is no effect on the reception of audio data from another terminal device. As described above, since the operation of stopping the transmission regardless of the reception of the jack signal is performed in each terminal device, the communication within the system is limited to three persons, and confusion due to the complicated communication can be avoided. it can.

It is also possible to add to the CPU 21 a function capable of transmitting an interrupt that interrupts a call from a terminal device in a transmission stopped state in order to transmit an urgent message such as rescue of an injured person. Further, in the above example, a case where a three-party call is permitted has been described, but it goes without saying that this can be appropriately changed to a two-party call or a four-party call. Further, in this example, transmission is limited to voice data, and is not limited to transmission of disaster data such as fire alarm or theft.

[0026]

As described above, in the disaster prevention monitoring system of the present invention, the voice signal is digitized so that it can be handled in the same manner as the disaster prevention signal, so that the disaster prevention signal line and the communication line are shared. There is an effect that can be. Therefore, it is possible to reduce costs and improve workability due to wire saving. Further, since an optical fiber can be positively adopted for the transmission line, it is possible to easily take lightning arrest measures and reduce the influence of noise.

According to the present invention, when data from a predetermined number or more of terminal devices is stored in the reception buffer, the data is transmitted from the terminal device regardless of whether or not a communication device connection signal is received. Is stopped, the number of speakers in the system can be limited. Therefore, it is possible to avoid confusion due to complicated communication in the system.

[Brief description of the drawings]

FIG. 1 is a diagram showing an entire configuration of an embodiment of a disaster prevention monitoring system according to the present invention.

FIG. 2 is a block diagram showing a configuration around a communication board of the terminal device.

FIG. 3 is a diagram illustrating a configuration of a transmission buffer.

FIG. 4 is a diagram illustrating a configuration of a reception buffer.

FIG. 5 is a diagram showing an entire configuration of a conventional disaster prevention monitoring system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Receiver 2 Distribution board 3 Repeater 4 Terminal 5 Line 6 Communication device 7 Display device 10 Terminal device 20 Communication board 21 CPU unit 22 A / D converter 23 D / A converter 24 First-in first-out memory (FIFO memory) 24a First-in-first-out memory for transmission 24b First-in-first-out memory for reception 25 RAM 25a Transmission buffer 25b Reception buffer 26 Communication control unit 29 Talk circuit 51 Disaster prevention signal line 52 Talk line 53 Transmission line

Continuation of the front page (56) References JP-A-2-249396 (JP, A) JP-A-5-336261 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G08B 23 / 00-31/00

Claims (6)

(57) [Claims] A plurality of terminal devices for disaster prevention and crime prevention are connected via a transmission line, and a communication device provided in the terminal device is connected to a communication device to thereby perform data transmission and voice communication between the terminal devices. In the disaster prevention monitoring system, the terminal device converts an audio signal input from the communication device through the communication circuit into digital data and outputs the digital data, and connects to the A / D converter. A first-in-first-out memory for transmission for storing the digital data and outputting the previously stored data earlier than the stored data, and temporarily storing the data output from the first-in first-out memory. And a receiving buffer for temporarily storing audio data transmitted to the terminal device, and storing data in the receiving buffer of the RAM. A first-in first-out memory for receiving data that is stored earlier than data stored later, a digital data in the first-in-first-out memory for reception is converted into a voice signal, and the speech circuit is operated. A D / A converter for outputting to the communication device via the communication device, a communication control unit connected to the RAM and the transmission line for exchanging data with another terminal device, the A / D converter, A disaster prevention monitoring system comprising: a first-in first-out memory for transmission, a RAM, a D / A converter, and a central control device that controls a voice communication by controlling a communication control unit. 2. The communication circuit sends a communication device connection signal to the central control device when a communication device is connected to the communication circuit, and the central control device receives the communication device connection signal. The disaster prevention monitoring system according to claim 1, wherein the voice communication control is performed only when there is a call. 3. The central control unit assembles the data in the transmission buffer into a transmission packet, sends the data to the communication control unit with an identifier indicating that the data is audio data, and sends the data to the communication control unit. 3. The disaster prevention monitoring system according to claim 1, wherein the transmission packet attaches an address indicating a transmission source to the transmission packet and transmits the transmission packet to the transmission path. 4. The central control device checks an identifier of the data received by the communication control unit, and sends the data to the reception buffer when the identifier is an identifier indicating audio data. The disaster prevention monitoring system according to claim 3, wherein 5. When the data from a plurality of terminal devices is stored in the reception buffer of the RAM, the central control device adds the data from each terminal device to the reception first-in first-out memory. 5. The method according to claim 1, wherein:
Disaster prevention monitoring system described in 1. 6. When the data from a predetermined number or more of the terminal devices is stored in the reception buffer of the RAM, the central control device determines whether or not the terminal device has received the communication device connection signal. The disaster prevention monitoring system according to any one of claims 1 to 5, wherein the transmission of audio data from the computer is stopped.