JP4711421B2 - Transmission system - Google Patents

Description

The present invention relates to a transmission system, and more particularly to a transmission system suitable for a disaster prevention system.

In a conventional sensor system, a terminal device performs a periodical transmission operation in which a signal is transmitted every predetermined time between the terminal device and a receiving board (see, for example, Patent Document 1).
JP 2003-016555 A

  However, in the conventional transmission system described above, since the receiving panel uses a commercial power source, it is sufficient to reduce the burden on the terminal device during periodic transmission. However, both the transmission side and the reception side are battery-driven. In some cases, it is desired to extend the life of the battery. To meet this demand, it is necessary to reduce current consumption on both the transmission side and the reception side.

An object of the present invention is to provide a transmission system that consumes less current on both the transmission side and the reception side of the transmission system.

The present invention includes a transmission period and a transmission suspension period longer than the transmission period, and transmits the same transmission information a plurality of times in one transmission period, and includes one transmission period and one transmission suspension period. And a transmission apparatus that repeats the transmission cycle, a reception period for receiving transmission information from the transmission apparatus, and a reception pause period that is shorter than the reception period. The transmission system includes a reception apparatus that forms one reception cycle by a period and one reception pause period and repeats this reception cycle, and the transmission pause period and the reception pause period are substantially the same.

According to the present invention, there is an effect that current consumption is small on both the transmission side and the reception side of the transmission system.

  The best mode for carrying out the invention is the following examples.

  FIG. 1 is a block diagram showing a wireless disaster prevention system 100 according to an embodiment of the present invention.

  The wireless disaster prevention system 100 includes a transmission device T and a reception device R.

  The transmission device T includes a fire detector SEa, a gas leak detector SEb, and a fire transmitter SEc. The transmission device T only needs to be configured by at least one of the fire detector SEa, the gas leak detector SEb, and the fire transmitter SEc.

  The transmission device T includes a transmission period and a transmission suspension period longer than the transmission period, and transmits the same transmission information a plurality of times in one transmission period, and one transmission period and one transmission. This is an example of a transmission apparatus in which one transmission cycle is formed by a pause period and this transmission cycle is repeated.

  The fire detector SEa is a smoke detector or a heat detector. The gas leak sensor SEb is a sensor having a detection element for city gas or LP gas. The fire transmitter SEc is a push button device that is manually operated by a person who discovers a fire and issues a fire alarm.

  The receiving device R includes an acoustic device 20, a light emitting device 30, and a vibration device 40. Note that the receiving device R only needs to be configured by at least one of the acoustic device 20, the light emitting device 30, and the vibration device 40.

  In addition, the receiving device R includes a reception period for receiving transmission information from the transmission device T, and a reception pause period shorter than the reception period, and one reception period and one reception pause period are used. This is an example of a receiving apparatus that forms one receiving cycle and repeats this receiving cycle.

  The transmission suspension period and the reception suspension period are almost the same.

  The sound device 20 may be a buzzer, for example, but is preferably a device capable of sound alert. The light emitting device 30 is a so-called strobe warning device that warns by flashing strong light. The vibration device 40 is a so-called vibrator that makes a human body feel a vibration and warn.

  FIG. 2 is a block diagram showing the fire detector SEa used in the disaster prevention system 100.

  The fire detector SEa includes a fire detection unit 11, a battery 12, a power supply circuit 13, an antenna 14, a transmission circuit 15, a voltage monitoring circuit 16, a control circuit 17, a storage unit 18, and an indicator lamp 19. Have

  In FIG. 2, the transmission circuit 15 does not have a reception circuit as a transmission circuit. The voltage monitoring circuit 16 confirms whether power is supplied. The control circuit 17 is configured by a microcomputer or the like. The storage unit 18 is a memory that holds necessary data. The indicator lamp 19 displays a fire alarm or a power supply voltage drop state by lighting or blinking.

  Further, the fire detector SEa is not provided with a receiving circuit, and is provided with only a detection portion for detecting a physical phenomenon and a transmission circuit for transmitting the detected physical phenomenon.

  The gas leak detector SEb is a device in which a gas detector or the like is provided instead of the fire detector 11 in the fire detector SEa. The fire transmitter SEc is a device provided with a switch input unit that detects a push button operation instead of the fire detection unit 11.

  Furthermore, the fire detector SEa and the gas leak detector SEb as the transmitting device T are self-recovering sensors. When self-recovering, the fact that self-recovering is included in the predetermined digital code is transmitted. Device.

  FIG. 3 is a block diagram showing the acoustic device 20 used in the disaster prevention system 100.

  The acoustic device 20 includes an antenna 21, a receiving circuit 22, a control unit 23, a storage unit 24, a power supply circuit 25, a battery 26, a voltage monitoring circuit 27, a drive circuit 28, a speaker 29, and an indicator lamp. 201. The acoustic device 20 is an example of the receiving device R and does not have a transmission circuit.

  The reception circuit 22 receives a signal from the transmission device T. The drive circuit 28 drives acoustic ringing, and in the case of voice, is constituted by a voice IC or the like. A buzzer or the like may be used instead of the speaker 29. The indicator lamp 201 displays a state of driving or power supply voltage drop by lighting / flashing.

  In the acoustic device 20, the light emitting device 30 uses a light emitting drive device instead of the drive circuit 28, and uses a light emitting unit such as a strobe instead of the speaker 29.

  The vibration device 40 uses the vibration unit in the acoustic device 20 instead of the drive circuit 28.

  Here, since the fire detector SEa as the transmission device T performs only transmission and does not perform reception, current consumption relating to reception operation does not flow, and it is not necessary to provide a reception circuit. Can be reduced.

  On the other hand, since the acoustic device 20, the light emitting device 30, and the vibration device 40 as the receiving device R do not perform transmission, current consumption relating to transmission operation does not flow, and it is not necessary to provide a transmission circuit. Can be reduced.

  According to the above embodiment, for example, the fire detector can be used as a transmission-only terminal and the acoustic device can be used as a reception-only terminal. Therefore, the device configuration of the disaster prevention system 100 is simple, and the current consumption is reduced. Can be reduced.

  Further, according to the above embodiment, unlike a self-contained fire alarm, it is not necessary to be a fire detector and an acoustic device, and for example, the fire detector needs to have an extra function of an acoustic device. In addition, it can be arranged in a house according to the function.

  Further, in the above embodiment, if each device has its own power source (battery), the power line connection can be omitted, so that no connection work is required. Similarly, in the above embodiment, if the signal transmission in each device is wireless, it is sufficient to install each device on the ceiling surface or wall surface, and the workability such as replacement or rearrangement of each device is remarkably improved. improves. That is, if it is a battery type and a radio | wireless type, the wiring operation | work to each apparatus is completely unnecessary, and it can arrange | position freely and it becomes a system which even an amateur can handle easily.

  FIG. 4 is a time chart showing the operation of the disaster prevention system 100.

  FIG. 4A is a timing chart illustrating the operation of the transmission device T in the disaster prevention system 100.

  As shown in FIG. 4 (1), when the transmission device T (terminal) detects a fire and sends a fire signal, for example, when a factor that requires signal transmission occurs, the transmission device T starts signal transmission. To do. Further, in principle, the signal transmission start timing is irrelevant to the ON / OFF operation of the receiving device R, and is not synchronized with each other.

  The transmission apparatus T has a transmission period A of, for example, 0.5 seconds, a transmission suspension period B of, for example, 1.5 seconds, and the transmission period A occurs, for example, five times. That is, one cycle is constituted by one transmission period A and one transmission suspension period B, and the transmission apparatus T repeats five cycles as a plurality of times. That is, ON and OFF are repeated 5 times.

  4 (4) is a diagram showing transmission information F1, F2, and F3 included in one transmission period A in the disaster prevention system 100. FIG.

  One transmission period A includes transmission information F1, F2, and F3, which are continuous transmissions of the same information, that is, the same transmission information is transmitted three times in one transmission period A.

  FIG. 4 (3) is a timing chart showing the timing received by the receiving device R in the disaster prevention system 100.

  FIG. 4 (5) is a diagram illustrating an example of the content of the transmission information F <b> 1 in the disaster prevention system 100.

  As shown in FIG. 4 (5), the transmission information F1 is composed of a synchronization signal FF that takes a transmission start timing, a call name signal AD that identifies a terminal to transmit, and a message MS that is information data. Yes. Note that transmission information F1 as shown in FIG. 4 (5) may be one frame, and predetermined RCR data, such as a bit synchronization signal and a frame synchronization signal, may be added to the head to form one transmission information.

  FIG. 4B is a timing chart showing the operation of the receiving device R in the disaster prevention system 100.

  In principle, the signal reception start timing in the receiving device R is irrelevant to the on / off operation of the transmitting device T, and is not synchronized with each other.

  The reception device R has a reception period C of 2.0 seconds, for example, and a reception suspension period D of 1.5 seconds, for example. That is, one cycle is constituted by one reception period C and one reception suspension period D, and the receiving apparatus R always repeats this cycle. That is, ON and OFF are always repeated.

  FIG. 4 (3) is a time chart showing the timing at which the receiving device R receives the transmission information F1, F2, and F3 in the states shown in FIGS. 4 (1) and 4 (2).

  In FIG. 4 (3), transmission is established at the timing at which the ON in FIG. 4 (2) and the ON in FIG. 4 (1) overlap. That is, as shown in FIG. 4A, the first turn-on of the transmission device T and the turn-on of the reception device R do not occur at the same time, but the second turn-on of the transmission device T and the reception device R On occurs at the same time, and transmission is established in this case. In this case, at least two of the transmission information F1, F2, and F3 are received.

  FIG. 5 is a diagram illustrating a time chart when the transmission circuit T starts transmission immediately before the ON signal of the output signal of the reception circuit R ends in the first embodiment.

  First, the relationship between the transmission period A and the transmission suspension period B of the transmission circuit T and the reception period C and the reception suspension period D of the reception circuit R is as follows.

Transmission period A = (Reception period C−Transmission suspension period B)
Transmission suspension period B = Reception suspension period D
FIG. 5 shows how the transmission information (c1 to c4) that can be received changes when the transmission start time by the transmission circuit T is deviated from the operation (a) of the reception circuit R (b1 to b4). It is shown. In each, the timing t1 is the transmission start timing of the transmission circuit T, and the timing t2 is the timing when reception of two pieces of transmission information is completed.

  FIG. 6 is a diagram illustrating a time chart in the case where the transmission circuit T starts transmission immediately before the OFF signal of the output signal of the reception circuit R ends in the first embodiment.

  First, also in FIG. 6, the relationship between the transmission period A and the transmission suspension period B of the transmission circuit T and the reception period C and the reception suspension period D of the reception circuit R is the same as in FIG. In FIG. 6 as well, how the transmission information (c1 to c4) that can be received is changed when the transmission start period of the transmission circuit T deviates from the operation (a) of the reception circuit R (b1 to b4). Shows how it will change.

In FIG. 6, it is assumed that the transmission suspension period B of the transmission circuit T is substantially the same as the reception suspension period D, and when the reception period C of the reception circuit R becomes shorter, the transmission period T of the transmission circuit T is equal to (6 Pieces of transmission information),
Reception period C> (transmission period A + reception pause period D)
Is necessary. However, if the reception period C is long, power consumption increases.

  Next, in FIG. 5, the relationship between the reception suspension period D of the reception circuit R and the transmission suspension period B of the transmission circuit T will be described.

In the case shown in FIG. 5, if the transmission suspension period B is shorter than the reception suspension period D, the number of transmission information that can be received is reduced in two transmission periods A (in six pieces of transmission information). ,
Transmission suspension period B> Reception suspension period D
become.

  However, if the transmission suspension period B is lengthened, the reception completion of two pieces of transmission information from the transmission start of the transmission circuit T is delayed. Here, the reason why the two pieces of transmission information are received is to guarantee the reliability of the communication data by comparing the data.

  Next, the relationship between the transmission period A and the transmission suspension period B of the transmission circuit T in the first embodiment will be described.

In the case shown in FIG. 6, if the transmission period A is long, one piece of transmission information becomes long and the number of pieces of transmission information that can be received decreases (in the case of b1 and b2).
Transmission period A> (Reception period C-Transmission suspension period B)
become.

  According to the above embodiment, the reception device R is intermittently driven (driven while sandwiching the reception pause period D), and the transmission device T transmits a plurality of transmission information multiple times (with the transmission pause period B sandwiched). Therefore, at least one piece of transmission information (at least one piece of transmission information F1, F2, and F3) can be always received during the reception period C of the receiving device R. Since the transmission device T is intermittently driven and the transmission device T is also intermittently driven, the power consumption of both can be minimized.

  Further, according to the above embodiment, if there are three or more pieces of transmission information within the transmission period A of the transmission apparatus T, when the transmission period A and the reception period C overlap, the transmission period A 2 The receiving device R can receive at least one piece of transmission information (at least one of the pieces of transmission information F1, F2, and F3) for two batches.

  Furthermore, according to the above-described embodiment, since the reception suspension period D is shorter than the reception period C, a state in which the transmission period A overlaps the reception period C can be realized.

  And according to the said Example, each of transmission information F1, F2, F3 is the same information, Comprising: Synchronous data which shows the beginning of this transmission information F1, F2, F3, and the terminal which is going to transmit transmission information It has one set constituted by ID data AD and a message MS indicating transmission information, and has a minimum amount of information.

  In addition, although the said Example is a wireless disaster prevention system, it can be applied to a wired disaster prevention system.

  Although the said Example is a disaster prevention system, the said Example can be applied to transmission systems other than a disaster prevention system.

  According to the above embodiment, for example, it has been described that the fire detector is a transmission-only terminal and the acoustic device is a reception-only terminal. .

  As a modification of the above embodiment, a case where error control data is added to the data of the transmission information F1 as shown in FIG.

  First, error control data is additional data for guaranteeing the reliability of communication data, and there are several types. For example, SUM data that is a calculation result obtained by adding all the data in the guaranteed range, a value obtained by taking the 2's complement of the calculation result of the SUM data, -SUM data, and all the data in the guaranteed range are exclusive ORed. XOR data (horizontal parity data) as a calculation result, or CRC data (cyclic code method) in which data is divided by a high-order polynomial and the remainder is added to a data string as a check code.

  If any one of the above error control data is added to the subsequent stage of the transmission information F1, reception of the transmission information by the receiving device R may be one, and two receptions are received as in the above embodiment. There is no need to contrast.

  Therefore, it is not necessary to transmit three or more pieces of the same transmission information in one transmission period A in the above embodiment, and one less than two pieces may be used. As a result, the transmission period A is shortened, and the current consumption during transmission of the transmission apparatus T can be reduced. At the same time, based on the shortening of the transmission period A, the reception period C of the reception apparatus R is changed to the reception suspension period. D can be brought close to D, that is, the receiving period C can be shortened, and the current consumption of the receiving device R can be reduced.

Further, as a different modification of the above embodiment, in the transmission operation of the transmission apparatus T as shown in FIG. 4A, a carrier sense signal for a predetermined time is transmitted before the transmission period for starting transmission of transmission information. You may do it. With this carrier sense signal, the reception operation of the receiving device R can be started, and it is not necessary to always repeat the reception period C and the reception suspension period D as in the above-described embodiment, thereby reducing current consumption. Can do.

The operation will be briefly described. Information to be transmitted to the transmission device T is generated. First, the transmission device T transmits a carrier sense signal for a predetermined time. This carrier sense signal is a signal such as an oscillation signal at a predetermined frequency that can be detected by the receiving device R through filter processing or the like.

  The receiving device R that has received the carrier sense signal prepares to receive transmission information, and repeats the reception period C and the reception suspension period D as in the above-described embodiment, a predetermined number of times, for example, five times.

  In addition, after a predetermined time for transmitting the carrier sense signal has elapsed, the transmission apparatus T repeats the transmission period A and the transmission suspension period B as in the above-described embodiment, a predetermined number of times, for example, five times.

The transmission operation of the transmission device T and the reception operation of the diagnosis device R are not synchronized because the reception timing of the carrier sense signal of the reception device R and the start timing of the reception period C are not determined, but in the repetitive operation, The transmission information is received by the receiving device R.

1 is a block diagram illustrating a wireless disaster prevention system 100 that is Embodiment 1 of the present invention. 2 is a block diagram showing a fire detector SEa used in the disaster prevention system 100. FIG. 1 is a block diagram showing an audio device 20 used in a disaster prevention system 100. FIG. 3 is a time chart showing the operation of the disaster prevention system 100. In Example 1, it is a figure which shows the time chart in case the transmission circuit T starts transmission just before the ON signal of the output signal of the receiving circuit R is complete | finished. In Example 1, it is a figure which shows the time chart in case the transmission circuit T starts transmission immediately before the OFF signal of the output signal of the receiving circuit R is complete | finished.

Explanation of symbols

100 ... Wireless disaster prevention system,
T: Transmitter,
SEa ... Fire detector,
11 ... Fire detection part,
15 ... Transmission circuit T,
16 ... Voltage monitoring circuit,
17 ... control unit,
19 ... Indicator,
SEb ... Gas leak detector,
SEc: Fire transmitter,
R: receiving device,
20 ... acoustic device,
21 ... antenna,
22 ... receiving circuit R,
23. Control unit,
27 ... Voltage monitoring circuit,
28 ... Drive circuit,
29 ... Speaker,
30. Light emitting device,
40 ... vibration device,
t1 ... transmission start timing of the transmission circuit T,
t2: Timing when reception of two pieces of transmission information is completed.

Claims (4)

A transmission period and a transmission suspension period longer than the transmission period, and the same transmission information is transmitted a plurality of times in one transmission period, and one transmission is performed by one transmission period and one transmission suspension period. A transmitter that forms a cycle and repeats this transmission cycle;
Comprising a reception period for receiving transmission information from the transmission device and a reception pause period shorter than the reception period, and forming one reception cycle by one reception period and one reception pause period; A receiver that repeats this receive cycle;
And the transmission suspension period and the reception suspension period are substantially the same. In claim 1,
The transmission system is a device that transmits the same transmission information three times or more in one transmission period. In claim 1 or claim 2,
One transmission information is information including synchronization data indicating the start of the transmission information, ID data of the transmission device, and message data indicating the content of the transmission information. In any one of Claims 1-3,
The transmitter is at least one of a fire detector, a gas leak detector, and a fire transmitter, and the receiver is at least one of an acoustic device, a light emitting device, and a vibration device. And transmission system.

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