JP2010239298A - Transmitting apparatus, receiving apparatus, transfer apparatus, and information transfer system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus in which data are hardly decrypted and which is immune to communication interference. <P>SOLUTION: A transmitting apparatus comprises: a transmitting-side control circuit including a first output section capable of outputting data of four bits and a second output section capable of outputting data of four bits; a first signal generating unit which is connected to the first output section of the transmitting-side control circuit and generates a first DTMF signal on the basis of the data of four bits outputted by the transmitting-side control circuit; a second signal generating unit which is connected to the second output section of the transmitting-side control circuit and generates a second DTMF signal on the basis of the data of four bits outputted by the transmitting-side control circuit; and a transmitting unit for transmitting the first DTMF signal generated by the first signal generating unit and the second DTMF signal generated by the second signal generating unit while placing these signals on a radio wave. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a transmission device, a reception device, a transmission device, and an information transmission system.

  The following patent document discloses a wireless communication system in which information is transmitted and received by performing communication between two wireless devices using a DTMF signal (Dual-Tone Multi-Frequency). The DTMF signal is a signal that combines two groups of frequencies, a low group and a high group, and is widely known as a so-called tone signal. The DTMF signal has an advantage that information can be accurately transmitted.

JP-A-8-32474

However, since the use band of the DTMF signal is disclosed, there is a problem that the DTMF signal is easily deciphered and susceptible to communication interference.
The present invention has been completed based on the above circumstances, and an object thereof is to provide a device that is difficult to decipher and is resistant to communication interruption.

  The transmitting device of the present invention defines a signal sound combining one sound from each of the first low group consisting of four frequencies f1 to f4 and the first high group consisting of four frequencies f5 to f8 as a first DTMF signal, A second low group consisting of f1 ′ to f4 ′ shifted in frequency with respect to the four low frequency f1 to f4, and f5 ′ to f8 ′ shifted in frequency with respect to the four high frequency f5 to f8. A first output unit capable of outputting 4-bit data and a second output unit capable of outputting 4-bit data when a signal sound combining one sound from the second high group is defined as a second DTMF signal; And a first signal generating unit connected to a first output unit of the transmitting side control circuit and generating the first DTMF signal based on 4-bit data output from the transmitting side control circuit; , Outgoing call A second signal generation unit connected to a second output unit of the control circuit and generating the second DTMF signal based on 4-bit data output from the transmission side control circuit; and the first signal generation unit generates the second signal generation unit. A transmitter for transmitting the first DTMF signal and the second DTMF signal generated by the second signal generator on a radio wave.

  The receiving apparatus according to the present invention generates a first DTMF signal by combining a signal sound from the first low group consisting of four low frequency frequencies f1 to f4 and the first high group consisting of four high frequency frequencies f5 to f8. F5 ′ in which the frequency is shifted with respect to the four low-frequency frequencies f1 to f4, and the second low-group consisting of f1 ′ to f4 ′ and the four high-frequency frequencies f5 to f8. When a signal sound obtained by combining one sound from each of the second high groups of f8 ′ is defined as a second DTMF signal, the reception unit that receives radio waves, and the first DTMF signal from the reception signal received by the reception unit A first signal reading unit that reads and outputs 4-bit data; a second signal reading unit that reads the second DTMF signal from the received signal received by the receiving unit and outputs 4-bit data; and the first signal Comprising a reception-side control circuit and a second input unit for taking the 4-bit data and the first input unit for taking in the 4-bit data of the collected unit output for outputting the second signal reading unit.

  The transmission device of the present invention includes the transmission device of the present invention and the reception device of the present invention, and the information transmission system of the present invention transmits event occurrence information using the transmission device of the present invention as a relay point.

  In the present invention, data is transmitted (transmitted / received) using two types of DTMF signals of the first DTMF signal and the second DTMF signal together. In this way, compared to the case where data is transmitted using only a single type of DTMF signal whose use band is disclosed, the data is less likely to be decrypted and communication interference is less likely to occur.

Configuration diagram of a reporting system according to an embodiment of the present invention Illustration of location conditions for slave stations The figure which shows that the information transmission network is constructed with the slave station Figure showing data structure of report data Figure showing an example of slave station installation Circuit diagram of phase loss detection circuit and power failure detection circuit Diagram showing contact switch connection Block diagram showing the electrical configuration of the slave station Block diagram showing electrical configuration of DTMF signal generation circuit (1) Correspondence table of first DTMF signal S1 (2) Correspondence table of second DTMF signal S2 (1) Diagram showing frequency of first DTMF signal S1 (2) Diagram showing frequency of second DTMF signal S2 Block diagram showing electrical configuration of DTMF signal reading circuit Block diagram showing the electrical configuration of the master station A diagram explaining the downtime Ta The figure which shows the operation in which abnormality occurrence information is relayed to each slave station and transmitted to the master station Configuration diagram of the reporting system (shows the location change of slave station F5) Figure showing a modification

An embodiment of the present invention will be described with reference to FIGS.
1. Configuration of the entire system The notification system U is intended to notify the monitoring staff of event occurrence information such as power distribution system abnormalities and slave station power supply abnormalities. And a plurality of slave stations F (in this embodiment, seven stations F1 to F7). Each of the master station G and the slave station F has a wireless communication function, and each of the slave stations F1 to F7 is arranged at a place satisfying the following arrangement condition in the monitoring area.

The arrangement conditions are the following two.
(1) One or more slave stations F are within a range where radio waves reach the master station G.
(2) When the master station G is upstream, the other slave stations F are within a range where radio waves reach one or more slave stations F arranged on the upstream side.
In FIG. 2, a circle indicated by a one-dot chain line indicates a range in which the radio wave of each slave station F reaches.

  By satisfying such an arrangement condition, as shown in FIG. 3, an information transmission network Z having the relay stations as relay points can be constructed by each of the slave stations F1 to F7 arranged in a scattered manner.

  In this embodiment, a station number “0” is assigned to the master station G, and station numbers “1” to “7” are assigned to the slave stations F, respectively. When event occurrence information is detected, the slave station F has a system configuration for transmitting the report data to the master station G while relaying each slave station F. As shown in FIG. 4, the report data has a data structure of “8 bits”, of which “4 bits” are assigned to the station number of each station, and the remaining 4 bits are assigned to information relating to event occurrence information. (See FIG. 10).

2. Configuration of Slave Station Each slave station F is composed of a slave station body 20 and a small radio (hereinafter simply referred to as a radio) 70, and is attached to, for example, a utility pole D for supporting an overhead distribution line ( (See FIG. 5). In this embodiment, a three-phase four-wire distribution system that distributes three-phase 200V and single-phase 100V is monitored, and the slave station body 20 is missing corresponding to the three-phase 200V distribution lines Lb, Lw, Lr A phase detection circuit 22 is provided, and a power failure detection circuit 25 is provided corresponding to a single-phase 100V lead wire (see FIG. 6).

  The phase loss detection circuit 22 includes three electromagnetic coils 23B, 23W, and 23R that are star-connected, and is configured such that phase voltages of three phases are applied to the electromagnetic coils 23B, 23W, and 23R. These electromagnetic coils 23B, 23W, and 23R constitute an electromagnetic relay together with the contact switches 24B, 24W, and 24R.

  Each contact switch 24B, 24W, 24R closes the make contact a when the electromagnetic coils 23B, 23W, 23R are energized, and closes the break contact b when not energized. These contact switches 24B, 24W and 24R are connected in parallel as shown in FIG. 7, each common terminal C is connected to the neutral line Lc, and each break contact b is connected to the output line L1 in common. Yes.

  From the above, when each of the three phases is healthy, the break contact b of each contact switch 24B, 24W, 24R is opened and the output line L1 is opened as shown in (1) of FIG. Become. On the other hand, if there is an open phase, the break contact b of the contact switch (24 W in this case) corresponding to that phase is closed as shown in (2) of FIG. Therefore, the output line L1 is connected to the neutral line Lc and the potential becomes zero. From the above, it is possible to detect the presence / absence of a phase failure in the three-phase 200V distribution line depending on whether the output line L1 is open or connected (potential zero).

  The power failure detection circuit 25 includes an electromagnetic coil 26 as in the case of the phase loss detection circuit 22. The electromagnetic coil 26 is provided between the neutral wire Lc and a single-phase 100V lead wire (distribution line Lb in the figure), and is configured to be applied with the single-phase 100V. The electromagnetic coil 26 and the contact switch 27 constitute an electromagnetic relay. The contact switch 27 connects the common terminal C to the neutral line Lc, and connects the break contact b to the output line L2. The contact switch 27 closes the make contact a when the electromagnetic coil 26 is energized, and closes the break contact b when not energized.

  From the above, if the single phase 100V is normally supplied, the break contact b of the contact switch 26 is opened, and the output line L2 is opened. On the other hand, when the single-phase 100V is out of power, the break contact b of the contact switch 26 is closed. As a result, the output line L2 is connected to the neutral line Lc and the potential becomes zero. From the above, it is possible to detect the presence or absence of a single-phase 100V power failure depending on whether the output line L2 is open or connected (potential zero).

  As shown in FIG. 8, the phase loss detection circuit 22 and the power failure detection circuit 25 are connected to a storage circuit 29 provided in the slave station body 20, and the phase detection and power failure are detected by these detection circuits 22 and 25. The information is stored in the storage circuit 29.

  In addition, a power supply monitoring circuit 28 is connected to the storage circuit 29. The power supply monitoring circuit 28 detects the output voltage and output current of the power supply (battery) 53 and monitors the presence or absence of a power supply abnormality. When a power supply abnormality is detected, the information is stored in the storage circuit 29. ing.

  Then, the control circuit 61 provided in the slave station main body 20 periodically accesses the storage circuit 29 to check the stored information, thereby confirming the presence / absence of a three-phase 200V distribution line L, single-phase 100V. It is configured to monitor whether there is a power outage or whether there is a power failure.

  As shown in FIG. 8, the slave station body 20 includes a control circuit 61, a DTMF signal generation circuit 31, a DTMF signal reading circuit 41, an interference prevention detection circuit 51, a timer 55, and a ROM 67.

  As shown in FIG. 9, the control circuit 61 (corresponding to “transmission side control circuit” and “reception side control circuit” of the present invention) includes a first output unit 62 including four output ports P1 to P4, and P5. Are provided with a second output unit 63 including four output ports P8 to P8, a first input unit 64 including four input ports P11 to P14, and a second input including four input ports P15 to P18. A portion 65 is provided. When the control circuit 61 detects an open phase, a power failure, or a power failure, the control circuit 61 outputs the 8-bit notification data in parallel using the first output unit 62 and the second output unit 63.

  Of the 8 bits of report data, 4 bits output from the first output unit 62 are assigned to the station numbers of the master station and the slave station as shown in (1) of FIG. As shown in (2) of FIG. 10, the 4 bits output from are assigned to the event occurrence status such as phase loss, power failure, power supply abnormality, and the like.

  As shown in FIG. 9, the DTMF signal generation circuit 31 includes a first DTMF signal generation IC 32 (corresponding to the “first signal generation unit” of the present invention), a first crystal oscillator 33, a second DTMF signal generation IC 34 (“ Corresponds to a “second signal generator”), a second crystal oscillator 35, and the like.

  Both the first DTMF signal generation IC 32 and the second DTMF signal generation IC 34 are provided with four input ports AD. The input ports A to D of the first DTMF signal generation IC 32 are connected to the first output unit 62 of the control circuit 61, and the input ports A to D of the second DTMF signal generation IC 34 are connected to the second output unit 63 of the control circuit 61. Is connected.

  Thus, both DTMF signal generation ICs 32 and 34 are connected in parallel to the control circuit 61, and the 4-bit data (station number information) output from the first output unit 62 of the control circuit 61 is the first DTMF. Input to the signal generation IC 32. The 4-bit data (information relating to the event occurrence status) output from the second output unit 63 of the control circuit 61 is input to the second DTMF signal generation IC 34.

  The first DTMF signal generation IC 32 generates a first DTMF signal S1 according to the input 4-bit data, and the second DTMF signal generation IC 34 generates a second DTMF signal S2 according to the input 4-bit data.

  A DTMF (Dual-Tone Multi-Frequency) signal is a signal sound in a voice frequency band known as a so-called tone signal, and the difference between the first DTMF signal S1 and the second DTMF signal S2 is that the center frequency is different.

  More specifically, as shown in FIG. 11 (1), the first DTMF signal S1 is one of the first low groups consisting of four frequencies f1 to f4 each having a frequency value shifted by about 10%. And the second DTMF signal S2 is a signal that combines any one of the sounds of the first high group consisting of four frequencies f5 to f8 whose frequency values are shifted by about 10%. 11 (2), any one of the sounds in the second low group consisting of f1 ′ to f4 ′ whose frequency values are shifted by about 10% and f5 whose frequency values are shifted by about 10%. This signal is a combination of any sounds in the second high group consisting of “˜f8”.

  In this embodiment, the frequencies f1 to f4 constituting the first low group are 679 Hz, 770 Hz, 852 Hz, and 941 Hz, respectively. The frequencies f5 to f8 constituting the first high group are 1209 Hz, 1336 Hz, 1477 Hz, and 1663 Hz, respectively, and the first DTMF signal generation IC 32 is set to generate eight frequencies defined as standards. .

  On the other hand, the frequencies f1 ′ to f4 ′ constituting the second low group are set so that the frequency is shifted higher by about 6% with respect to the frequencies f1 to f4 determined as standards. The frequencies f5 ′ to f8 ′ constituting the second high group are also set so that the frequency is shifted higher by about 6% with respect to the center frequencies f5 to f8 determined as standards.

  It should be noted that the above-mentioned setting is that “the second low group includes the frequency f1 ′ or the frequency f2 ′ (in the embodiment, the frequency f1 ′) in a band between the frequency f1 and the frequency f2. The first low group is shifted, and the second high group includes the frequency f5 ′ or the frequency f6 ′ (in the embodiment, the frequency f5 ′) in a band between the frequency f5 and the frequency f6. Is a shift of the entire first high group. In order to generate a DTMF signal having a frequency that deviates from the standard, the frequency fc ′ of the oscillator 35 that operates the second DTMF signal generation IC 34 is set to the frequency fc (basic frequency) of the oscillator 33 that operates the first DTMF signal generation IC 32. ) To the higher.

  The output port O 1 of the first DTMF signal generation IC 32 and the output port O 2 of the second DTMF signal generation IC 34 are both connected to a mixer (adder) 36. The output terminal of the mixer 36 is connected to the microphone terminal 84 </ b> A of the wireless device 80.

  From the above, the first DTMF signal S1 generated by the first DTMF signal generation IC 32 and the second DTMF signal S2 generated by the second DTMF signal generation IC 34 are mixed (added) by the mixer 36 and then transmitted through the radio 80. It becomes the composition which is done.

  As described above, according to the present embodiment, the notification data composed of 8 bits is transmitted by the mixed signal obtained by mixing the first DTMF signal S1 and the second DTMF signal S2.

  Next, the DTMF signal reading circuit 41 will be described. As shown in FIG. 12, the DTMF signal reading circuit 41 includes a first DTMF signal reading IC 42 (corresponding to the “first signal reading unit” of the present invention), a first crystal oscillator 43, and a second DTMF signal reading IC 44 (“ It corresponds to the second signal reading section ”), the second crystal oscillator 45, and the like. The frequency of the first crystal oscillator 43 is “fc”, whereas the frequency of the second crystal oscillator 45 is “fc ′”, which is “fc” as in the generation circuit 31 side. On the other hand, the frequency is shifted higher.

  The input port I1 of the first DTMF signal reading IC 42 and the input port I2 of the second DTMF signal reading IC 44 are commonly connected to the speaker terminal 82A of the wireless device 80, and the output signal output from the wireless device 80 to the speaker is the first DTMF. It is configured to be input to both the signal reading IC 42 and the second DTMF signal reading IC 44.

  The first DTMF signal reading IC 42 corresponds to the first DTMF signal generation IC 32, reads the sounds of the eight center frequencies f1 to f8 generated by the first DTMF signal generation IC 32, and decodes them into 4-bit binary data. On the other hand, the second DTMF signal reading IC 44 corresponds to the second DTMF signal generation IC 34, and reads the sounds of the eight center frequencies f1 ′ to f8 ′ generated by the second DTMF signal generation IC 34 and outputs them to 4-bit binary data. Decode to

  These DTMF signal reading ICs 42 and 44 can read signals included in the frequency band d of about 2% before and after the center frequency f, and read signals in the frequency band “W” shown in FIG. I can't. As described above, the four center frequencies f1 ′ to f4 ′ of the second low group are shifted by about 6% with respect to the four center frequencies f1 to f4 of the first low group. The four center frequencies f5 ′ to f8 ′ constituting the high group are also shifted by about 6% with respect to the four center frequencies f5 to f8 constituting the first high group.

  From the above, signal sounds of eight frequencies f1 to f8 emitted by the first DTMF signal generation IC 32 can be read only by the first DTMF signal reading IC 42, and f1 ′ to f8 ′ emitted by the second DTMF signal generation IC 34. The signal sound of eight frequencies can be read only by the second DTMF signal reading IC 44.

  Both the first DTMF signal reading IC 42 and the second DTMF signal reading IC 44 are provided with four output ports A to D. The output ports A to D of the first DTMF signal reading IC 42 are connected to the first input unit 64 of the control circuit 61, and the output ports A to D of the second DTMF signal reading IC 44 are connected to the second input unit 65 of the control circuit 61. Is connected.

  As described above, both the DTMF signal reading ICs 42 and 44 are connected in parallel to the control circuit 61, and the control circuit 61 outputs the 4-bit data output from the first DTMF signal reading IC 42 and the output of the second DTMF signal reading IC 44. 4 bits of data, that is, a total of 8 bits of data is input simultaneously.

  The 4-bit data output from the first DTMF signal reading IC 42 is the information of the station number because the first DTMF signal S1 is decoded, and the 4-bit data output from the second DTMF signal reading IC 44 is Since the second DTMF signal S2 is decoded, it is information related to the event occurrence status.

  As shown in FIG. 12, the first DTMF signal reading IC 42 and the second DTMF signal reading IC 44 are provided with detection terminals E1 and E2, respectively. The detection terminal E1 becomes H level on condition that the first DTMF signal reading IC 42 detects a valid signal sound (first DTMF signal S1), and otherwise becomes L level. Further, the detection terminal E2 becomes H level on condition that the second DTMF signal reading IC 44 detects a valid signal sound (second DTMF signal S2), and otherwise becomes L level.

  On the other hand, the control circuit 61 is provided with a check port P20. The check port 20 is connected to an output line of an AND gate 46 (corresponding to “confirming means” of the present invention). The detection terminal E1 of the first DTMF signal reading IC 42 is connected to one input terminal of the AND gate 46, and the detection terminal E2 of the second DTMF signal reading IC 44 is connected to the other input terminal.

  By adopting such a circuit configuration, the detection terminal E1 and the detection terminal E2 are provided only when both the first DTMF signal S1 and the second DTMF signal S2 are included in the reception signal received by the radio 80. As a result of both being at the H level, the H level confirmation signal Se is input from the AND gate 46 to the check port P20 of the control circuit 61.

  Only when the confirmation signal Se is input, the control circuit 61 determines that the normal data is received, and reads the 8-bit data input through both the input ports 64 and 65. .

  Subsequently, returning to FIG. 8, the radio device 80 will be described. The wireless device 80 includes a receiving circuit 81 (corresponding to the “receiving unit” of the present invention), a speaker 82, a transmitting circuit 83 (corresponding to the “transmitting unit” of the present invention), a microphone 84, a switching circuit 85, an antenna 87, and a speaker terminal 82A. A microphone terminal 84A and a PTT terminal 88A are provided. The connection of each circuit is as shown in FIG. 8. Both the reception circuit 81 and the transmission circuit 83 are connected to the antenna 87 via the switching circuit 85, and the reception circuit 81 has a speaker 82 and a speaker terminal 82A. The microphone 84 and the microphone terminal 84A are connected to the transmission circuit 83.

  The receiving circuit 81 demodulates the received signal received by the antenna 87, and then outputs a signal sound (a mixed signal Sh obtained by mixing the first DTMF signal S1 and the second DMF signal S2) through the speaker terminal 82A or the speaker 82. The transmission circuit 83 modulates a signal sound (mixed signal Sh obtained by mixing the first DTMF signal S1 and the second DMF signal S2) captured through the microphone terminal 84A or the microphone 84 and outputs the modulated signal sound to the antenna 87.

  The switching circuit 85 operates according to the connection state of the PTT terminal 88A. When the PTT terminal 88A is open, the antenna 87 is connected to the receiving circuit 81, and the PTT terminal 88A is at the L level (low level). In this case, the antenna 87 is connected to the transmission circuit 83.

  In this embodiment, the PTT terminal 88A is connected to the ground via the switch SW1, and the switch SW1 can be ON / OFF controlled by the control signal Sr output from the control circuit 21. Therefore, when the control circuit 61 turns on the switch SW1, the PTT terminal 88A becomes L level, and the receiving circuit 81 is connected to the antenna 87. On the other hand, when the control circuit 61 turns off the switch SW1, the PTT terminal 88A is opened, and the transmission circuit 83 is connected to the antenna 87. Normally, the switch SW1 is controlled to be in the OFF state by the control circuit 61, and the wireless device 80 is in a state of performing a receiving operation for receiving radio waves.

3. Configuration of Master Station G As shown in FIG. 13, the master station G includes a radio unit 180 and a master station main body 120. The radio unit 180 of the master station G includes a receiving circuit 181, a transmitting circuit 183, a switching circuit 185, an antenna 187, a speaker terminal 182A, a microphone terminal 184A, and a PTT terminal 188A. The radio unit 180 performs the same function as the radio unit 80 of the slave station F, and modulates the signal sound (the mixed signal Sh obtained by mixing the first DTMF signal S1 and the second DMF signal S2) input through the speaker terminal 182A. After that, the signal is transmitted through the antenna 187, the received signal received through the antenna 187 is demodulated, and the signal sound (the mixed signal Sh obtained by mixing the first DTMF signal S1 and the second DMF signal S2) is output through the speaker terminal 182A. is there.

  The switching circuit 185 operates in accordance with the connection state of the PTT terminal 188A, similarly to that of the slave station F. When the PTT terminal 188A is open, the antenna 187 is connected to the reception circuit 181 and the PTT terminal 188A is In the case of L level (low level), the antenna 187 is connected to the transmission circuit 183.

  In this embodiment, the PTT terminal 188A is connected to the ground via the switch SW1, and the switch SW1 can be ON / OFF controlled by the control signal Sr output from the control circuit 161. Therefore, when the control circuit 161 of the master station main body 120 turns on the switch SW1, the PTT terminal 188A becomes L level, and the receiving circuit 181 is connected to the antenna 187. On the other hand, when the control circuit 161 turns off the switch SW1, the PTT terminal 188A is opened, and the transmission circuit 183 is connected to the antenna 187. Normally, the control circuit 161 controls the switch SW1 to be in an OFF state, and the wireless unit 180 is in a state of performing a receiving operation for receiving radio waves.

  The master station main body 120 includes a DTMF signal generation circuit 131, a DTMF signal reading circuit 141, a crosstalk prevention detection circuit 151, a power supply circuit 153, and a ROM 167. Similar to the DTMF signal generation circuit 31 of the slave station, the DTMF signal generation circuit 131 includes a first DTMF signal generation IC 32, a first crystal oscillator 33, a second DTMF signal generation IC 34, a second crystal oscillator 35, and the like. It has the same function as the generation circuit 31. Similarly to the DTMF signal reading circuit 41 of the slave station, the DTMF signal reading circuit 141 includes a first DTMF signal reading IC 42, a first crystal oscillator 43, a second DTMF signal reading IC 44, a second crystal oscillator 45, and the like. It has the same function as the DTMF signal reading circuit 41.

  Since the master station G receives a report from the slave station F, the detection circuit such as the phase loss detection circuit 22 and the power failure detection circuit 25, and the storage circuit 29 are not provided for storing the detection results. First, notification notification means such as a display 125 and a buzzer 127 are provided.

  The master station main body 120 is provided with a reset switch SW2. The reset switch SW2 is connected to the control circuit 161. The control circuit 161 transmits notification data including information of the station number “0” through the wireless unit 180 on the condition that the reset switch SW2 is turned on. In this communication system U, when the report data including the station number “zero” is received, each slave station F determines the broadcast protocol so as to reset the information in the storage circuit 29, and the monitor turns on the reset switch SW2. By doing so, the reporting system U can be reset (the storage circuit 29 of each slave station F constituting the information transmission network Z can be cleared).

4). Broadcast Protocol Broadcast protocol (1) to (4) is defined for slave station F.
(1) If information on the occurrence of an abnormality is stored in the storage circuit 29, the notification data is broadcast using the wireless device 80.
(2) When the broadcast is received, the report data is broadcast if the report data includes anything other than its own station number.
(3) The broadcast is suspended for a certain time after the broadcast is completed.
(4) When the report data including the station number “0” is received, the storage circuit 29 is reset.

  Here, “broadcast” means to send information in one direction without specifying the partner, and “communication” to send information after specifying the partner and establishing a connection. Is a different concept.

  In the communication system U, a broadcast program for executing the broadcast protocol is stored in the ROM 67 of each slave station body 20, and each control circuit 61 issues a command to each circuit according to the broadcast program written in the ROM 67. As a result, each slave station operates according to the broadcasting protocols (1) to (4).

  Note that the timer 55 provided in the slave station main body 20 measures the pause time Ta during which the broadcast of (3) is paused. In the present embodiment, the pause time Ta is set to a time obtained by multiplying the broadcast time To required for each slave station by the number N of slave stations constituting the information transmission network Z (seven in this example). (See FIG. 14).

5). Explanation of Operation and Effect Normally, the radio communication functions of the slave stations F1 to F7 and the master station G are all controlled to perform a reception operation. Then, the control circuit 61 of the slave station main body 20 of each of the slave stations F1 to F7 periodically performs processing for accessing the storage circuit 29 and confirming whether or not abnormality occurrence information has been written. This monitoring state continues if there is no power distribution system or power failure.

  Hereinafter, the operation of the notification system U will be described by taking as an example a case where a power failure has occurred in the power distribution system monitored by the slave station F5. As shown in FIGS. 3 and 15, when a power failure occurs at time t0, the power failure detection circuit 25 detects the power failure and stores the information in the storage circuit 29 of the slave station main body 20. Then, the power failure information is confirmed by the control circuit 61 of the slave station F5.

  When the occurrence of abnormality is confirmed, the control circuit 61 of the slave station F5 first outputs a switch switching signal Sr and turns on the switch SW1. As a result, the connection state of the PPT terminal 88A of the radio device 80 is switched from open to L level (low level), and the connection destination of the antenna 87 is switched from the reception circuit 81 to the transmission circuit 83.

  Then, the control circuit 61 of the slave station F5 broadcasts the report data using the radio 80 according to the broadcast protocol (1). In this case, since the station number is “5”, the data “0101” is output through the first output unit 62, and the data “0010” is output through the second output unit 63 because a power failure has occurred. Is output (see FIG. 10).

  The 4-bit data “0101” output through the first output unit 62 is input to the first DTMF signal generation IC 32, and the 4-bit data “0010” output through the second output unit 62 is input to the second DTMF signal generation IC 34. Is done. Then, the first DTMF signal generation IC 32 generates a first DTMF signal S1 (here, a signal in which the sound of “f2” and the sound of “f6” are combined) according to the input data. The second DTMF signal generation IC 34 generates a second DTMF signal S2 (here, a signal in which the sound of “f3 ′” and the sound of “f5 ′” are combined) according to the input data.

  Thereafter, the first DTMF signal S1 and the second DTMF signal S2 are mixed by the mixer 36 to become a mixed signal Sh. Then, the hybrid signal Sh is input to the radio device 80. The hybrid signal Sh input to the radio 80 is modulated by the transmission circuit 83 and then sent to the antenna 85 for broadcasting.

  After the broadcast is completed, the slave station F5 pauses the broadcast for the pause time Ta according to the broadcast protocol (3). Then, the connection destination of the antenna 87 is switched from the transmission circuit 83 to the reception circuit 81 during the pause time Ta. As a result, the slave station F5 returns to the receivable state.

  On the other hand, when broadcasting is performed at the slave station F5, the radio wave transmitted by the slave station F5 is received by the slave station F4 installed within the radio wave reachable range of the slave station F5 (see FIGS. 3 and 15). . In the slave station F4 that has received the radio wave, the reception signal received by the reception circuit 81 of the wireless device 80 is demodulated, and the hybrid signal Sh is output to the DTMF signal reading circuit 41.

  As shown in FIG. 12, the output mixed signal Sh is taken into both the first DTMF signal reading IC 42 and the second DTMF signal reading IC 44. Then, the first DTMF signal reading IC 42 reads the first DTMF signal S 1 from the captured mixed signal Sh and outputs 4-bit binary data (here, data “0101”) to the first input unit 64 of the control circuit 61. To do. The second DTMF signal reading IC 44 reads the second DTMF signal S2 from the captured mixed signal Sh and outputs 4-bit binary data (here, data “0010”) to the second input unit 65 of the control circuit 61. To do.

  In this case where the radio 80 receives the hybrid signal Sh, the detection terminal E1 of the first DTMF signal reading IC 42 and the detection terminal E2 of the second DTMF signal reading IC 44 are both at the H level. Is sent to the check port P20 of the control circuit 61.

  Then, the control circuit 61 of the slave station F4 determines that the normal data is received, accesses the first input unit 64 and the second input unit 65, and performs a process of reading the notification data. Thus, the report data issued by the slave station F5 is transmitted to the control circuit 61 of the slave station F4.

  Upon receiving the report data, the control circuit 61 of the slave station F4 performs a process of switching the connection destination of the antenna 87 from the reception circuit 81 to the transmission circuit 83, and then converts the received report data into the slave protocol according to the broadcast protocol (2). Broadcast in the same procedure as station F5. As a result, a hybrid signal Sh obtained by hybridizing the first DTMF signal S1 and the second DTMF signal S2 is transmitted from the slave station F4.

  Then, after the broadcast is completed, the slave station F4 pauses the broadcast for the pause time Ta according to the broadcast protocol (3). Then, the connection destination of the antenna 87 is switched from the transmission circuit 83 to the reception circuit 81 during the pause time Ta. As a result, the slave station F4 returns to a receivable state.

  On the other hand, when broadcasting is performed at the slave station F4, the radio wave transmitted by the slave station F4 is received by the slave station F3 installed within the radio wave reachable range of the slave station F4 (see FIGS. 3 and 15). . Then, if the confirmation signal Se is input from the AND gate 46, the control circuit 61 of the slave station F3 determines that normal data is received, and accesses the first input unit 64 and the second input unit 65. To read the report data. Thus, the report data issued by the slave station F4 is transmitted to the control circuit 61 of the slave station F3.

  Thereafter, similarly to the slave station F4, the slave station F3 performs a process of switching the connection destination of the antenna 87 from the reception circuit 81 to the transmission circuit 83, and then broadcasts the received report data according to the broadcast protocol (2).

  Then, after the broadcast is completed, the slave station F3 pauses the broadcast for the pause time Ta according to the broadcast protocol (3). Then, the connection destination of the antenna 87 is switched from the transmission circuit 83 to the reception circuit 81 during the pause time Ta. As a result, the slave station F3 returns to the receivable state.

  In this way, each slave station F that has received the broadcast broadcasts report data of the same content on condition that the confirmation signal Se is input from the AND gate 46, so that the report data is relayed to each slave station F. Then, it is transmitted to the master station G in order.

  Finally, the slave station F1 broadcasts and receives it to the master station G. In the master station G that has received the radio wave, similarly to the slave station F, the reception signal received by the reception circuit 181 of the radio unit 180 is demodulated, and the hybrid signal Sh is output from the radio unit 180 to the DTMF signal reading circuit 141. Is done.

  The DTMF signal reading circuit 141 extracts the first DTMF signal S1 from the output mixed signal Sh, decodes it into 4-bit binary data (here, data “0101”), and outputs it to the control circuit 161. Further, the second DTMF signal S2 is read from the captured mixed signal Sh, decoded into 4-bit binary data (data “0010” in this case), and output to the control circuit 61.

  Then, the control circuit 161 performs a process of reading the output 8-bit notification data on condition that the H level confirmation signal Se is input to the check port P20.

  In this case, the breakdown of the report data is 4 bits of “0101” corresponding to the station number “5” and 4 bits of “0010” corresponding to the power failure. Therefore, the control circuit 161 of the master station G notifies the buzzer 127 and displays the station number “5” and “power outage” on the display 125. Thus, the supervisor is notified that a power failure has occurred in the distribution system monitored by the slave station F5.

  In this way, in the notification system U, the abnormality occurrence information of the distribution system can be reported to the monitoring staff at the monitoring station together with the information on the occurrence location. In the notification system U, 4 bits of the notification data are broadcast by the first DTMF signal S1, and the remaining 4 bits are broadcast by the second DTMF signal S2. In addition, each of the control circuits 61 of the slave stations F1 to F7 and the control circuit 161 of the master station G read the notification data on condition that an H level confirmation signal Se is input to the check port P20. Process.

  If it does in this way, each slave station F and the master station G will receive the jamming electric wave using the 1st DTMF signal which combined the 1st low group and 1st high group which were established as a standard, and received it. Even in this case, the detection terminal E2 of the second DTMF signal reading IC 44 remains at the L level, so that the H level confirmation signal Se is not input to the check port P20. Therefore, since the jamming radio wave is not regarded as normal data, the control circuit 61 of the slave station F and the control circuit 161 of the master station G do not malfunction due to the influence of the jamming radio wave.

  In particular, since this reporting system U is used to monitor the distribution system in areas with poor traffic such as mountainous areas, there are no abnormalities in the distribution system in mountainous areas. If it is displayed due to a malfunction, the supervisor who does not know it will go to the mountainous area to see the state of the power distribution system, which is totally useless, but if this reporting system U It is possible to avoid such a situation in advance, and the practical effect is extremely high.

  Even if the notification data is intercepted, it is very unlikely that both the first DTMF signal S1 and the second DTMF signal S2 are decoded, and this point is also effective.

  In addition, as shown in FIG. 11, the second low group is obtained by shifting the whole of the first low group so that the frequency f1 ′ is included in the band between the frequency f1 and the frequency f2. In the second high group, the entire first high group is shifted so that the frequency f5 ′ is included in the band between the frequency f5 and the frequency f6.

  If the second low group and the second high group are set in this way, the data is transmitted using only the first DTMF signal S1 even though the first DTMF signal S1 and the second DTMF signal S2 are used together to transmit data. The total width of the band to be used is almost the same as the case of transmitting, and this point is also effective.

  In addition, in this notification system, it is possible to send 8-bit data at the same time, and twice as much data can be sent per unit time as compared with a normal DTMF signal system in which only 4-bit data is delayed. It becomes possible. Therefore, it is possible to convey more information to the supervisor without reducing the rate.

  In addition, the distribution system may be forced to change the system configuration in response to an increase or decrease in consumers. In such a case, the information transmission network Z needs to be reorganized. In this regard, in the notification system U, information is transmitted by broadcasting. Broadcasting only emits radio waves in one direction, so as long as radio waves arrive, the slave station F can be placed freely anywhere and there is no need to specify the other party unlike communications. .

  Therefore, for example, as shown in FIG. 16, when the arrangement of the slave station F5 is changed from the diagonally lower left position in the figure to the upper center position in the figure, the partner to which the slave station F5 transmits information is the child Although the station F4 is changed to the slave station F3, the setting changes associated therewith are of course not required for the slave stations F3 and F4, and the slave station F5 need not be changed at all. In addition, when adding the slave stations F, it is not necessary to change any settings of the existing slave stations F1 to F7. Therefore, it is easy to reorganize the constructed information transmission network Z.

  In the notification system U, the pause time Ta is determined by the broadcast protocol (3), and the broadcast is stopped for a certain time after the broadcast is completed. Moreover, the pause time Ta is set to a time obtained by multiplying the broadcast time To required for each slave station by the number N of slave stations constituting the information transmission network Z (seven in this example). .

  By doing so, each slave station broadcasts information only once, so that the same information does not continue to be broadcast indefinitely between each slave station F constituting the information transmission network Z.

  In the above description of the operation, an example in which the report data is transmitted to the master station G by broadcasting each station in the order of the slave station F5 → the slave station F4 → the slave station F3 → the slave station F1 has been described. Of course, in addition to the above-mentioned slave stations F5, F4, F3, and F1, the slave station F that performs the broadcast is of course in the process of relaying. This is because, for example, the broadcast of the slave station F3 receives the slave station F6 in addition to the slave station F1. Therefore, when the slave station F1 broadcasts following the slave station F3, the slave station F6 also broadcasts in the same manner. However, in this case, the broadcast of the slave station F6 is so-called downstream (direction away from the master station G) and is not directed to the master station G side. Further, depending on the arrangement of the slave stations, the radio waves broadcast by the plurality of slave stations F may be received simultaneously by the other slave stations F. In such a case, priority is given to the stronger radio waves. .

  Next, the reset operation will be described. When the reset switch SW2 of the master station G is operated, notification data including information on the station number “0” is broadcast by the master station G. When the master station G broadcasts, the broadcast notification data is also sequentially broadcast by each slave station F and received by each slave station F constituting the information transmission network Z. Each slave station F that has received the notification data including the information of the station number “0” resets the storage circuit 29 according to (4) of the broadcast protocol.

  Thus, the monitoring staff at the monitoring station can reset the storage state of the storage circuit 29 of each slave station F constituting the information transmission network Z by operating the reset switch SW2 of the master station G. And by enabling such a reset operation, the following effects can be obtained.

  As described above, in the notification system U, each slave station F broadcasts information only once. For this reason, when a radio malfunction or interference occurs, transmission of information by broadcasting is interrupted in the middle, and report data may not be transmitted to the master station G.

  In this respect, if the storage state of the storage circuit 29 of each slave station F is reset by performing the above reset operation, the slave station F in which an abnormality in the distribution system or a power supply abnormality has occurred, The power supply abnormality is detected again, and the abnormality occurrence information is written in the storage circuit 29. Then, the slave station F broadcasts the report data including its own station number, and broadcast transmission is performed again by each slave station F constituting the information transmission network Z. Therefore, the report data that cannot be transmitted due to interruption in the middle can be transmitted to the master station G.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.

  (1) In the above-described embodiment, an example in which the distribution system and the power supply are detected as an example of application of the notification system U is illustrated, but the event to be detected is not limited to the illustrated example. For example, a notification system that detects the opening / closing of a door and reports it, or a reporting system that detects the presence or absence of a fire and reports it.

(2) In the above embodiment, the frequency is shifted to the higher side, but as shown in FIG. 17, the frequency can be shifted to the lower side.
(3) In the above embodiment, the event information is transmitted by broadcasting. However, the event information may be transmitted by communication.

20 ... Slave station main body 22 ... Phase loss detection circuit (event information detection means)
25. Power failure detection circuit (event information detection means)
28 ... Power failure detection circuit (event information detection means)
DESCRIPTION OF SYMBOLS 29 ... Memory circuit 31 ... DTMF signal generation circuit 32 ... 1st DTMF signal generation IC (equivalent to "the 1st signal generation part" of the present invention)
34 ... 2nd DTMF signal generating IC (corresponding to "second signal generating section" of the present invention)
36... Mixer 41... DTMF signal reading circuit 42... First DTMF signal reading IC (corresponding to “first signal reading unit” of the present invention)
44 ... 2nd DTMF signal reading IC (corresponding to "second signal reading unit" of the present invention)
46. AND gate (corresponding to "confirming means" of the present invention)
61... Control circuit (corresponding to “transmission side control circuit” and “reception side control circuit” of the present invention)
62 ... 1st output part 63 ... 2nd output part 64 ... 1st input part 65 ... 2nd input part 80 ... Radio | wireless machine 81 ... Reception circuit (equivalent to the "reception part" of this invention)
83... Transmission circuit (corresponding to “transmission unit” of the present invention)
DESCRIPTION OF SYMBOLS 120 ... Master station body 161 ... Control circuit 131 ... DTMF signal generation circuit 141 ... DTMF signal reading circuit 180 ... Radio | wireless part 181 ... Reception circuit (equivalent to the "reception part" of this invention)
183: Transmission circuit (corresponding to the “transmission unit” of the present invention)
F1 to F7 ... slave stations (corresponding to "transmitting device", "receiving device", "transmitting device" of the present invention)
G: Master station (corresponding to “transmission device”, “reception device”, “transmission device” of the present invention)
S1 ... 1st DTMF signal S2 ... 2nd DTMF signal Sh ... Hybrid signal SW1 ... Switch SW2 ... Reset switch U ... Notification system (corresponding to "information transmission system" of the present invention)

Claims (10)

A signal sound combining one sound from each of the first low group consisting of four frequencies f1 to f4 and the first high group consisting of four frequencies f5 to f8 is defined as a first DTMF signal,
A second low group consisting of f1 ′ to f4 ′ shifted in frequency with respect to the four low frequency f1 to f4, and f5 ′ to f8 ′ shifted in frequency with respect to the four high frequency f5 to f8. When a signal sound combining one sound from the second high group is defined as the second DTMF signal,
A transmission-side control circuit having a first output unit capable of outputting 4-bit data and a second output unit capable of outputting 4-bit data;
A first signal generator connected to the first output of the transmitter control circuit and generating the first DTMF signal based on 4-bit data output from the transmitter control circuit;
A second signal generating unit connected to a second output unit of the transmitting side control circuit and generating the second DTMF signal based on 4-bit data output from the transmitting side control circuit;
A transmission device, comprising: a transmission unit that transmits the first DTMF signal generated by the first signal generation unit and the second DTMF signal generated by the second signal generation unit on a radio wave.   2. The mixer according to claim 1, further comprising: a mixer that adds the first DTMF signal generated by the first signal generation unit and the second DTMF signal generated by the second signal generation unit and outputs the sum to the transmission unit. Outgoing device.   3. The transmission according to claim 2, wherein the transmission-side control circuit divides 8-bit data into 4 bits at the same time and outputs them simultaneously to both the first output unit and the second output unit. apparatus. A signal sound in which one sound is combined from each of the first low group consisting of four low frequency f1 to f4 and the first high group consisting of four high frequency f5 to f8 is defined as a first DTMF signal,
A second low group consisting of f1 ′ to f4 ′ shifted in frequency with respect to the four low frequency f1 to f4, and f5 ′ to f8 ′ shifted in frequency with respect to the four high frequency f5 to f8. When a signal sound combining one sound from the second high group is defined as the second DTMF signal,
A receiver for receiving radio waves;
A first signal reading unit that reads the first DTMF signal from the received signal received by the receiving unit and outputs 4-bit data;
A second signal reading unit that reads the second DTMF signal from the received signal received by the receiving unit and outputs 4-bit data;
A reception-side control circuit having a first input unit that captures 4-bit data output from the first signal reading unit and a second input unit that captures 4-bit data output from the second signal reading unit. Receiver device.   Confirmation means for outputting a confirmation signal indicating that the data is normal to the reception-side control circuit on condition that the reception signal includes two DTMF signals of the first DTMF signal and the second DTMF signal. The transmitting device according to claim 4, wherein:   The receiving-side control circuit has a total of 8 bits including the 4-bit data fetched from the first input unit and the 4-bit data fetched from the second input unit on condition that the confirmation signal is input The transmission device according to claim 5, wherein the data is read.   A transmission device comprising: the transmission device according to claim 1 or 2; and the reception device according to claim 4 or 5.   A transmission device comprising: the transmission device according to claim 3; and the reception device according to claim 6. The second low group is obtained by shifting the whole of the first low group so that the frequency f1 ′ or the frequency f2 ′ is included in a band between the frequency f1 and the frequency f2.
8. The second high group is obtained by shifting the whole of the first high group so that the frequency f5 ′ or the frequency f6 ′ is included in a band between the frequency f5 and the frequency f6. Or the transmission apparatus of Claim 8.   An information transmission system for transmitting event occurrence information using the transmission device according to any one of claims 7 to 9 as a relay point.

Images