JP2021028610A - Standard radio wave distribution device - Google Patents

Abstract

To simplify signal processing and a circuit configuration to reduce the cost and power consumption, and to improve the convenience of installing a transmission module in a standard radio wave distribution device.SOLUTION: A standard radio wave distribution device 1 receives time information from a master clock module 2 and transmits a simulated standard radio wave from a transmission module 4. The master clock module 2 generates a time code from the time information, and generates a voltage signal that corresponds to the high level of the pulse signal representing the time code and becomes the first voltage state and corresponds to the low level and becomes the second voltage state. A transmission line 6 is a pair of electric wires, and transmits a voltage signal applied between the master clock module 2 and the two electric wires. The transmission module 4 includes a pair of input terminals connected to a transmission line 6 to which a voltage signal is applied, operates using the voltage between the input terminals as a power source, and transmits a radio wave of a standard frequency as a simulated standard radio wave by switching the amplitude according to the voltage state of the voltage signal.SELECTED DRAWING: Figure 1

Description

The present invention relates to a technique for delivering a radio wave imitating a standard radio wave used for automatic correction of a radio clock or the like.

The standard radio wave is a radio wave transmitted by a government agency or the like as a national standard or an international standard of standard time and frequency, and in Japan, it is transmitted from two transmission stations at different frequencies (40 kHz, 60 kHz). A time code representing time information is transmitted by standard radio waves in a predetermined format, and devices such as radio-controlled clocks (hereinafter simply referred to as radio-controlled clocks) have a function of receiving standard radio waves and adjusting the time. doing.

In order to maintain the accuracy of the time of the radio-controlled clock, it is preferable to adjust the time regularly, and in this respect, it is required that the installation location of the radio-controlled clock is in an environment where standard radio waves can be stably received. However, the usage environment of the radio-controlled timepiece by the user is not always a suitable reception environment for standard radio waves.

Therefore, a device has been proposed that enables the time adjustment function of the radio-controlled clock even in a place where the standard radio wave does not reach from the transmission station by transmitting a radio wave corresponding to the standard radio wave. In Patent Document 1 below, a long-wave band standard radio wave signal received from a transmission station is modulated to be in the VHF band or UHF band, combined with a TV signal, and transmitted by a cable laid in the building. , A device that demodulates a standard radio wave signal of the original band at a transmission destination and radiates it from an antenna is disclosed.

Japanese Patent No. 5329253

When a standard radio signal is superimposed on another signal and transmitted by a cable, there is a problem that the signal processing becomes complicated and the circuit scale becomes large because processing and circuits for combining and demodulating are required. As a result, the cost and power consumption of the device can be increased. Further, since the transmission module that demodulates and radiates the standard radio wave signal transmitted by the cable is basically restricted to the weak intensity of the radio wave output, it can be installed in a plurality of places in a large building or the like. Since they can be installed in various places, it is convenient to make the transmission module small so as not to stand out and to eliminate the need to connect to a commercial power outlet.

The present invention has been made to solve the above problems and problems, and the cost and power consumption can be reduced by simplifying the signal processing and the circuit configuration, and the convenience in installing the transmission module is improved. The purpose is to provide a standard radio wave distribution device.

(1) The standard radio wave distribution device according to the present invention is a device that receives time information by a master clock module and transmits a simulated standard radio wave imitating a standard radio wave from a transmission module connected to the master clock module by a transmission line. The master clock module generates a time code in a format used for the standard radio wave based on the time information, and corresponds to a high level of a pulse signal representing the time code in a first voltage state. A voltage signal that becomes a second voltage state corresponding to the low level is generated, and the transmission line is a pair of electric wires, and the voltage signal applied between the two electric wires is transmitted. The transmission module includes a pair of input terminals connected to the transmission line and to which the voltage signal is applied, operates using the voltage between the input terminals as a power source, and as the simulated standard radio wave, a radio wave of a standard frequency. Is transmitted by switching the amplitude according to the voltage state of the voltage signal.

(2) In the standard radio wave distribution device according to (1) above, the first voltage state is a voltage equal to or higher than the threshold value at which the transmission module operates, and the second voltage state is a voltage lower than the threshold value. The transmission module operates when the voltage signal is in the first voltage state to transmit radio waves of the standard frequency, while stops operating when the voltage signal is in the second voltage state. can do.

(3) In the standard radio wave distribution device according to (2) above, when the transmission module has a higher potential than the second input terminal in the first voltage state, the first input terminal has a higher potential than the second input terminal. Transmits radio waves whose standard frequency is the first standard frequency, while transmitting radio waves which are the second standard frequency when the second input terminal has a higher potential than the first input terminal. It can be configured to be.

(4) In the standard radio wave distribution device according to (3) above, the transmission module generates an oscillation signal of the first standard frequency and an oscillation signal of the second standard frequency. Based on the second oscillation circuit, the switching signal generation circuit that generates the switching control signal according to the high / low relationship between the first input terminal and the second input terminal, and the switching control signal. A switching unit that switches which of the oscillating signals input from the first oscillating circuit and the second oscillating circuit is output, and a transmitting unit that converts the oscillating signal output from the switching unit into radio waves and transmits the oscillating signal. And can be configured to have.

(5) In the standard radio wave distribution device according to (3) above, the transmission module includes an oscillation circuit that generates an oscillation signal having a common multiple of the first standard frequency and the second standard frequency, and the oscillation circuit. A switching signal generation circuit that generates a switching control signal according to the high-low relationship between the first input terminal and the second input terminal, and the first and second standard frequencies based on the switching control signal. A frequency conversion circuit that selects either one and generates an oscillation signal of the selected standard frequency from the multiplication oscillation signal, and a transmitter that converts the oscillation signal output from the frequency conversion circuit into radio waves and transmits the oscillation signal. Can be configured to have.

(6) In the standard radio wave distribution device according to (1) above, the first and second voltage states are all voltages equal to or higher than the threshold at which the transmission module operates, and the transmission module is input to the above. A determination means for determining whether the voltage signal is in the first or second voltage state and the radio wave of the standard frequency are transmitted with the first amplitude in the first voltage state, and the second In the voltage state, the configuration may include a transmission means for transmitting with a second amplitude reduced by a predetermined ratio with respect to the first amplitude.

(7) In the standard radio wave distribution device according to (6) above, the determination means is a marker or a position marker arranged in a predetermined format in the time code based on the change pattern of the voltage signal. A pulse can be detected and the voltage state corresponding to the pulse can be determined as the first voltage state.

(8) In the standard radio wave distribution device according to (7) above, when the transmission means has a higher potential than the second input terminal in the first voltage state, the first input terminal has a higher potential than the second input terminal. , The standard frequency is set to the first standard frequency, while the standard frequency is set when the second input terminal has a higher potential than the first input terminal in the first voltage state. It can be configured to be set to the second standard frequency.

(9) In the standard radio wave distribution device according to (3) to (5) and (8) above, the master clock module switches whether or not to invert the direction in which the voltage signal is applied to the transmission line. It can be configured to have an output polarity switching means.

(10) In the standard radio wave distribution device according to the above (1) to (9), the transmission module is attached to a housing, a support column erected on the inner surface of the housing, and the support column, and is attached to the housing. The configuration may include a circuit board supported away from the inner surface of the body, and a bar antenna bound to the circuit board and supported away from the inner surface of the housing.

According to the present invention, a standard radio wave distribution device capable of simplifying signal processing and circuit configuration and reducing cost and power consumption can be obtained, and the transmission module can be installed without the need for miniaturization or connection to a commercial power source. A standard radio wave distribution device with improved convenience is realized.

It is a schematic diagram for showing the schematic structure of the standard radio wave distribution device which concerns on embodiment of this invention. It is a schematic diagram explaining the structure of the time code used for the standard radio wave of Japan. It is a block diagram which shows the schematic structure of the master clock module in 1st Embodiment of this invention. It is a figure which shows the schematic circuit structure of the transmission module in 1st Embodiment of this invention. It is a schematic flow chart of the operation and processing of the master clock module in the 1st Embodiment of this invention. It is a schematic signal waveform diagram about the voltage signal output from the master clock module and the radio wave transmitted from the transmission module in the 1st Embodiment of this invention. It is a schematic perspective view of the transmission module in embodiment of this invention. It is a figure which shows the schematic circuit structure of the transmission module in the 2nd Embodiment of this invention. It is a flow diagram explaining the schematic operation of the control circuit of the transmission module in the 2nd Embodiment of this invention. It is a figure which shows the schematic circuit structure of the transmission module in 3rd Embodiment of this invention. It is a schematic flow chart of the operation and processing of the master clock module in the 3rd Embodiment of this invention. It is a schematic signal waveform diagram about the voltage signal output from the master clock module and the radio wave transmitted from the transmission module in the 3rd Embodiment of this invention. It is a schematic flow chart regarding the operation of the control circuit of the transmission module in the 3rd Embodiment of this invention.

Hereinafter, embodiments of the present invention (hereinafter referred to as embodiments) will be described with reference to the drawings.

FIG. 1 is a schematic diagram for showing a schematic configuration of a standard radio wave distribution device 1 according to an embodiment. The configuration shown in FIG. 1 is an example, and is a configuration example common to each embodiment described below.

The standard radio wave distribution device 1 is configured to include a master clock module 2, a transmission module 4, and a transmission line 6, and has a function of distributing a radio wave signal corresponding to a standard radio wave to the radio clock 8 to enable time adjustment. ..

The master clock module 2 and the transmission module 4 are connected by a transmission line 6. Further, the standard radio wave distribution device 1 can be provided with a plurality of transmission modules 4, and they can be commonly connected to one master clock module 2.

The master clock module 2 receives time information from the outside of the standard radio wave distribution device 1, and sends a voltage signal modulated based on the time information from terminals A and B to the transmission line 6. Specifically, the master clock module 2 generates a time code in a format used for a standard radio wave based on time information, and first corresponds to a high level (H level) of a pulse signal representing the time code. A voltage signal that becomes the second voltage state corresponding to the low level (L level) is generated.

The transmission line 6 is composed of electric wires 6a and 6b wired in pairs, and a voltage signal is applied between the master clock module 2 and both electric wires 6a and 6b to transmit the voltage signal. In the present embodiment, it is assumed that the electric wire 6a is connected to the terminal A of the master clock module 2 and the electric wire 6b is connected to the terminal B of the master clock module 2.

The transmission module 4 includes a pair of input terminals P and Q connected to a transmission line 6 and to which a voltage signal is applied, and operates using the voltage between the input terminals as a power source. Further, the transmission module 4 generates and transmits a radio wave corresponding to a standard radio wave based on the voltage signals applied to the input terminals P and Q. Here, a radio wave corresponding to this standard radio wave is referred to as a simulated standard radio wave. That is, the radio wave transmitted by the transmission module 4 is not the standard radio wave itself, but a simulated standard radio wave that imitates the standard radio wave, and the simulated standard radio wave basically functions in the same manner as the standard radio wave for the radio clock 8. Specifically, the transmission module 4 transmits a radio wave of a standard frequency as a simulated standard radio wave by switching the amplitude depending on whether the voltage signal is in the first voltage state or the second voltage state.

The standard frequency is the frequency of the standard radio wave. In Japan, the standard radio wave transmitted from the Otakadoyayama standard radio wave transmission station in Fukushima prefecture is 40 kHz, and the standard frequency is transmitted from the Haganeyama standard radio wave transmission station in Saga prefecture. The radio wave is 60 kHz.

For example, the standard radio wave distribution device 1 is used in a building, the master clock module 2 is installed in the building at a convenient location for acquiring time information from the outside, and the transmission line 6 is installed in the building. It is laid across multiple rooms and floors. Further, a plurality of transmission modules 4 may be installed so that radio clocks 8 installed at a plurality of locations in the building can receive simulated standard radio waves. Although FIG. 1 shows an example in which the transmission line 6 is only one system, the transmission line 6 of a plurality of systems may be extended from the master clock module 2 or the transmission line 6 may be branched in the middle. You may. Further, as described above, since the transmission module 4 supplies power and transmits time information only by connecting a pair of input terminals P and Q to the transmission line 6, it is necessary to prepare a power supply line separately from the transmission line. There is no. Therefore, by using the existing transmission line, for example, the transmission line for in-house broadcasting or the transmission line for premises telephones as it is, it is possible to realize the standard radio wave distribution device 1 without performing new wiring work. ..

FIG. 2 is a schematic diagram illustrating the configuration of a time code used for a standard radio wave in Japan. Specifically, FIG. 2 shows an example in which the time information is "17:25 on Thursday, April 1, 2004, no leap second within one month".

The time code is transmitted by repeating 60 seconds (60 bits) in one cycle. That is, one bit is assigned to each second of one minute and one pulse is output. Markers (M) and position markers (P0 to P5) are arranged in a predetermined format in the time code, and the time and the like are represented by binary data stored at bit positions other than M and P0 to P5. M, P0 to P5 are represented by pulses having a width of 0.2 seconds, and "0" and "1" constituting the binary data are represented by pulses having a width of 0.8 seconds and a width of 0.5 seconds, respectively. The minimum unit of time included in the binary data is "minutes", and the information of "seconds" can be obtained by counting the pulses in the time code of one cycle.

In FIG. 2, the upper and lower rows are in the positive direction of the time t in the right direction, the upper row represents 0 seconds ≤ t <30 seconds, and the lower row represents 30 seconds ≤ t <60 seconds in one cycle. The hatched rectangle is the period of the pulse. The rising position of the pulse of M corresponds to the positive minute (0 seconds per minute), and the rising positions of P1 to P5 and P0 correspond to 9 seconds, 19 seconds, 29 seconds, 39 seconds, 49 seconds, and 59 seconds, respectively. .. Here, the state in which the pulse is rising is the H level of the pulse signal, and the state in which the pulse is falling is the L level. In the bits corresponding to M, P0 to P5, the H level is reached in the first 0.2 seconds of 1 second assigned to the bits, and the L level is reached in the remaining 0.8 seconds. Similarly, the bits constituting the binary data also become H level in a period of 0.8 seconds or 0.5 seconds corresponding to the pulse width from the beginning of 1 second, and become L level in the remaining period. Then, the standard radio wave is generated by amplitude-modulating the carrier wave of the standard frequency according to the H level and the L level of the time code, and when the amplitude at the H level is 100%, the amplitude at the L level is 10%. Is stipulated.

Hereinafter, some embodiments will be described in order. At that time, the elements having the same functions as the elements in the above-described embodiment are designated by the same reference numerals, and duplicate description may be omitted in the later embodiments.

[First Embodiment]
FIG. 3 is a block diagram showing a schematic configuration of the master clock module 2 in the standard radio wave distribution device 1 of the first embodiment.

The master clock module 2 includes a receiving means 20, a time adjusting means 22, an internal clock timing means 24, a time code bit extracting means 26, an output polarity switching means 28, and a pulse output means 30.

The receiving means 20 receives the time information from the time information source. As a time information source, radio signals such as long-wave standard radio waves from standard radio transmission stations and satellite radio waves from GPS (Global Positioning System) and signals from time servers on the Internet such as NTP (Network Time Protocol) servers are used. can do. Specifically, the receiving means 20 is provided with an antenna or is connected to the Internet to acquire time information from those time information sources.

The time adjusting means 22 adjusts the time measured by the internal clock measuring means 24 at any time based on the current time information acquired by the receiving means 20. For example, the time adjusting means 22 corrects the timing error in the internal clock timing means 24. Further, the time adjusting means 22 corrects the delay caused by signal processing and transmission in the standard radio wave distribution device 1 from the internal clock measuring means 24 to the radio wave radiation of the transmission module 4, and sets the time set in the internal clock measuring means 24. Can be determined.

The internal clock timing means 24 measures the passage of time and generates time information. Specifically, the internal clock timing means 24 updates the time information by measuring the passage of time from the time based on the time set by the time adjusting means 22. For example, the internal clock timing means 24 generates binary data representing the total day, day of the week, hour, minute, and second from January 1st of the year as time information.

The time code bit extracting means 26 determines the pulse width of the bit corresponding to the second in the time code for each second timed by the internal clock timing means 24. Specifically, if the second is the timing of M, P0 to P5 in the time code, the time code bit extraction means 26 sets the pulse width to 0.2 seconds, while if the timing is other than that, for example, The bit corresponding to the timing is extracted from the bit string of the binary data generated by the internal clock timing means 24, and the pulse width is set to either 0.8 seconds or 0.5 seconds according to the value.

The output polarity switching means 28 is a circuit for switching the direction of the voltage signal output from the pulse output means 30 to the transmission line 6. Here, the direction of the voltage signal is defined by the magnitude relationship between the potentials of the terminal A and the terminal B. For example, the forward direction of the voltage signal is the state where the terminal A has a higher potential than the terminal B, and the reverse direction of the voltage signal. It is defined as a state in which the terminal B has a higher potential than the terminal A. The direction can be set by the user, for example, and the output polarity switching means 28 either makes the direction of applying the voltage signal to the transmission line forward or reverses it, depending on the setting. Switch whether to reverse the direction. As will be described later, depending on the direction of the voltage signal set by the output polarity switching means 28, which of the two standard frequencies (40 kHz and 60 kHz) is used as the frequency of the simulated standard radio wave transmitted from the transmission module 4 is determined. Can be controlled.

The pulse output means 30 is a circuit that generates a pulse having a pulse width set by the time code bit extraction means 26 and outputs it as a voltage signal from terminals A and B to the transmission line 6. Specifically, the rising timing of the pulse is the timing of the positive second in the time counting by the internal clock timing means 24, and when the H level of the pulse starts from the positive second and the time corresponding to the pulse width elapses, the pulse is released. It goes down from H level to L level.

The voltage signal output to the transmission line 6, that is, the potential difference between the terminals A and B becomes larger than the L level at the H level of the pulse. In the present embodiment, when the output of the voltage signal to the transmission line 6 is set forward by the output polarity switching means 28, a pulse is output to the terminal A with the terminal B as the ground potential, while the transmission line 6 is used. When the output to is set in the opposite direction, a pulse is output to the terminal B with the terminal A as the ground potential. In this embodiment, the pulse voltage is 24 volts [V]. That is, a potential difference of 24 V is applied between the electric wires 6a and 6b of the transmission line 6 corresponding to the H level of the pulse, and the potential difference is set to 0 V at the L level.

The pulse output means 30 controls on / off of the pulse by operating a switch such as a transistor. Further, the pulse output means 30 is configured with a circuit so as to secure a sufficient driving ability for the transmission line 6 to be laid. That is, in the example in which the pulse output means 30 outputs a pulse of 24 V, a voltage signal of substantially 24 V is basically applied over the entire length of the transmission line 6 connected to the pulse output means 30. On the other hand, when the transmission line 6 is laid for a long time exceeding the driving capacity of the pulse output means 30, a circuit for amplifying the voltage signal may be separately provided in the middle of the transmission line 6.

FIG. 4 is a diagram showing a schematic circuit configuration of the transmission module 4 according to the first embodiment. The transmission module 4 includes a bridge circuit 40, a constant voltage regulator 42, a 40 kHz oscillation circuit 44, a 60 kHz oscillation circuit 46, a switching signal generation circuit 48, an analog switch 50, an amplifier circuit 52, and an antenna 54.

The bridge circuit 40 is a bridge commutator composed of diodes D1 to D4, and can output the input signal applied between the transmission line 6 and the terminals P and Q by full-wave rectification. Here, the direction of the voltage signal applied between the terminals P and Q is switched depending on whether the two terminals are connected to the electric wires 6a or 6b, and the output polarity switching means 28 of the master clock module 2 is used. It also switches depending on the setting of. The bridge circuit 40 generates a voltage having a constant polarity from the voltage signal of the transmission line 6 whose direction can change, and outputs the voltage to the constant voltage regulator 42. Specifically, the connection points between D1 and D2 and the connection points between D3 and D4 are connected to GND and VIN, which are the input terminals of the constant voltage regulator 42, respectively, and the direction of the voltage signal input to the bridge circuit 40 Regardless, the potential of VIN with respect to GND is kept non-negative. Here, assuming that GND is the ground potential and the potential of VIN is called the input voltage of the constant voltage regulator 42, in the present embodiment, it corresponds to the period of the H level of the pulse in the pulse output means 30 of the master clock module 2. , The input voltage of the constant voltage regulator 42 becomes positive.

The constant voltage regulator 42 converts the input voltage into a predetermined voltage used as a power source for the transmission module 4. Specifically, the constant voltage regulator 42 outputs the predetermined voltage during the H level period of the pulse in the master clock module 2. That is, during the H level period, the constant voltage regulator 42 functions as a power source, and thus the transmission module 4 operates. On the other hand, during the period of the L level of the pulse, the voltage between the electric wires 6a and 6b becomes 0V, and the output of the predetermined voltage from the constant voltage regulator 42 stops, so that the transmission module 4 stops operating.

The 40 kHz oscillation circuit 44 is a first oscillation circuit that generates an oscillation signal of a first standard frequency (40 kHz), and a 60 kHz oscillation circuit 46 is a second oscillation circuit that generates an oscillation signal of a second standard frequency (60 kHz). , Both operate when power is supplied to generate an oscillation signal, and stop oscillation when power is stopped. That is, the 40 kHz oscillation circuit 44 and the 60 kHz oscillation circuit 46 output the oscillation signal only while the power is being supplied.

Switching signal generating circuit 48 generates a switch control signal corresponding to the level relationship between the potential phi _Q of the first potential of the input terminal P phi _P and the second input terminal Q, and outputs it to the analog switch 50. In the present embodiment, the switching signal generation circuit 48 is configured by using the diode D5 and the resistance elements R1 and R2 connected in series. In D5, the anode is connected to the terminal P, the cathode is connected to one end of the resistance row consisting of R1 and R2, and the other end of the resistance row is grounded. _{A potential corresponding to φ P} appears on the cathode of D5, and the potential obtained by resistance division is given to the analog switch 50 as a switching control signal at the connection point between R1 and R2. Specifically, at the time of output of the H level in the master clock module 2, the wire 6a, side high potential terminal P is connected among 6b φ _{H (=} 24V), the side where the terminal Q is connected phi _{L (=} When it is 0V), the switching signal generation circuit 48 outputs a positive potential as a switching control signal, while when the electric wire on the terminal P side is φ _L and the electric wire on the terminal Q side is φ _H , switching is performed. The ground potential is output as a control signal. The positive potential of the switching control signal when the terminal P side becomes 24V by the resistance division by R1 and R2 is matched with the rated input voltage of the analog switch 50.

The analog switch 50 is a switching unit that switches which of the oscillation signals input from the first oscillation circuit and the second oscillation circuit is output based on the switching control signal. In the present embodiment, the analog switch 50 has a configuration in which switching is performed depending on whether the potential of the switching control signal is above or below the threshold value, and when the switching control signal is a positive potential, the first oscillation circuit is 40 kHz. The 40 kHz oscillation signal generated by the oscillation circuit 44 is selectively output, and when the switching control signal is the ground potential, the 60 kHz oscillation signal generated by the second oscillation circuit 60 kHz oscillation circuit 46 is selectively output. Output.

The amplifier circuit 52 and the antenna 54 are transmission units that convert the oscillation signal output from the analog switch 50, which is a switching unit, into radio waves and transmit the signal. The amplifier circuit 52 amplifies the oscillation signal output by the analog switch 50 and outputs it to the antenna 54. The antenna 54 transmits the oscillation signal input from the amplifier circuit 52 as radio waves into the air. For example, the antenna 54 is composed of a ferrite bar antenna or a loop antenna.

The standard radio wave distribution device 1 having the above configuration radiates radio waves from the transmission module 4 only during the H level period in the master clock module 2. That is, the amplitude of the radio wave is 0 during the L level period in the master clock module 2, and the simulated standard radio wave transmitted from the transmission module 4 is an intermittent wave.

Further, as described above, there are two directions for connecting the transmission module 4 and the transmission line 6, and correspondingly, the terminals P and Q of the transmission module 4 and the terminals A and B of the master clock module 2 are connected. There are also two directions. Here, the state in which the terminal P is connected to the terminal A and the terminal Q are connected to the terminal B is transmitted in the order connection state of the transmission module 4, and the state in which the terminal P is connected to the terminal B and the terminal Q is connected to the terminal A. It is defined as the reverse connection state of module 4. The transmission module 4 in the forward connection state emits a radio wave of 40 kHz when the master clock module 2 outputs a forward voltage signal, and emits a radio wave of 60 kHz when the master clock module 2 outputs a reverse voltage signal. Radiate. Correspondingly, regarding the setting state of the output polarity switching means 28, the setting frequency for setting the voltage signal in the forward direction is set to 40 kHz, and the setting state for setting the voltage signal in the reverse direction is set to 60 kHz. I will define it as.

Next, the operation of the standard radio wave distribution device 1 according to the present embodiment will be further described.

FIG. 5 is a schematic flow chart of operations and processes in the master clock module 2. When the power of the master clock module 2 is turned on (step S2), the receiving means 20 continuously executes the process of receiving the time information (steps S4 and S6). When the receiving means 20 acquires the time information (when “YES” in step S6), the time adjusting means 22 corrects the time information measured by the internal clock timing means 24 using the acquired time information (when the time information is “YES” in step S6). Step S8).

The internal clock timing means 24 is timed (step S10), and the time code bit extraction means 26 has a second count value of “00”, “09”, “19”, “29”, “39” in the internal clock time measuring means 24. , "49", "59" (when "YES" in step S12), 0.2 seconds representing the marker M and the position markers P0 to P5 are set as the pulse width, and the pulse output means 30 sets the voltage. A pulse with a width of 0.2 seconds is output as a signal. The direction of the voltage signal is selected according to the state of the set frequency of the output polarity switching means 28 (step S14), and when the set frequency is 40 kHz, a pulse of 0.2 seconds is output to the terminal A side (step S16), and the set frequency is 60 kHz. In the case of, a pulse of 0.2 seconds is output to the terminal B side (step S18).

On the other hand, if the count value of the second in the internal clock timing means 24 is other than "00", "09", "19", "29", "39", "49", "59" (in step S12, " In the case of "NO"), the time code bit extraction means 26 extracts a bit corresponding to the position indicated by the count value in the time code from the bit string of the binary data generated by the internal clock timing means 24 (step S20). , The pulse width is set to either 0.5 seconds or 0.8 seconds according to the value of the extracted bit (step S22).

Specifically, when the bit value is "1", the pulse width is 0.5 seconds. Then, the direction of the voltage signal is selected according to the state of the set frequency (step S24), and when the set frequency is 40 kHz, a pulse of 0.5 seconds is output to the terminal A side (step S26), and when the set frequency is 60 kHz, the terminal. A pulse of 0.5 seconds is output to the B side (step S28).

When the bit value is "0", the pulse width is 0.8 seconds. Then, the direction of the voltage signal is selected according to the state of the set frequency (step S30), and when the set frequency is 40 kHz, a pulse of 0.8 seconds is output to the terminal A side (step S32), and when the set frequency is 60 kHz, the terminal. A pulse of 0.8 seconds is output to the B side (step S34).

The master clock module 2 repeats the processes of steps S12 to S34 in conjunction with the count of the internal clock timing means 24 in step S10. Further, the counting by the internal clock timing means 24 is usually performed with reference to the clock generated by the crystal oscillator circuit. The master clock module 2 periodically performs, for example, the processes of steps S4 to S8 so that the count errors do not accumulate.

FIG. 6 is a schematic signal waveform diagram of the voltage signal output from the master clock module 2 and the radio wave transmitted from the transmission module 4. 6 (a) and 6 (b) show the case where the voltage signal is in the forward direction and the case where the voltage signal is in the reverse direction, respectively. In each case, the output potential of the terminal A of the master clock module 2 and the terminal B are in order from the top. The output potential of the above and the amplitude of the transmitted radio wave from the transmitting module 4 are shown on a common time axis. By the way, the time axis is horizontal, and the right direction is positive.

When the voltage signal is forward, as shown in FIG. 6A, a pulse is output from the pulse output means 30 to the terminal A. That is, in the present embodiment, the potential of the terminal A is set to 24 V during the output period of the H level, and the potential of the terminal A is set to 0 V during the output period of the L level. Further, the terminal B is maintained at 0V. On the other hand, the potential change of the terminals A and B when the voltage signal shown in FIG. 6B is in the opposite direction is replaced with that of the case of FIG. 6A, and a pulse is output to the terminal B. That is, in the present embodiment, the potential of the terminal B is set to 24V during the output period of the H level, the potential of the terminal B is set to 0V during the output period of the L level, and the potential of the terminal A is maintained at 0V.

Regardless of the direction of the voltage signal, the transmission module 4 transmits an intermittent wave having an amplitude in a period of H level. When the transmission module 4 is in the forward connection state, the transmission frequency is set to 40 kHz in the case of a forward voltage signal and 60 kHz in the case of a reverse voltage signal. On the other hand, when the transmission module 4 is in the reverse connection state, the transmission frequency is set to 60 kHz in the case of a forward voltage signal and 40 kHz in the case of a reverse voltage signal.

FIG. 7 is a schematic perspective view of the transmission module 4. The transmission module 4 has a structure in which the circuit shown in FIG. 4 is housed in the housing 60, and in FIG. 7, the internal structure is shown through the housing 60. The internal structure includes a support column 62, a circuit board 64, and a bar antenna 66.

The housing 60 can be, for example, a box shape and a rectangular parallelepiped having a longitudinal direction corresponding to the bar antenna 66.

The support column 62 is erected on, for example, one of the inner surfaces (referred to as the bottom surface) forming a rectangular parallelepiped of the housing 60. For example, the columns 62 are arranged beside the bar antenna 66, and two columns 62 are arranged at intervals in the long axis direction of the bar antenna 66.

Basically, the main part of the circuit shown in FIG. 4 other than the antenna 54 is mounted on the circuit board 64. The bar antenna 66 corresponds to the antenna 54 in the circuit of the transmission module 4, includes a ferrite bar and windings around it, and the windings are connected to the circuit board 64 and fed from the amplifier circuit 52. The bar antenna 66 is tied to the circuit board 64, for example, with a binding band 68. The tie 68 is, for example, relatively wide and located in the center of the bar antenna 66. For example, a heat shrink tube is used as the binding band 68.

The bar antenna 66 and the circuit board 64 bundled together are supported by columns apart from the inner surface of the housing 60. Specifically, the circuit board 64 is connected to the support column 62. For example, the circuit board 64 is fixed to the support column 62 in a plan view with an antenna adjacent portion 64a extending along the bar antenna 66 and a portion protruding from the antenna adjacent portion 64a toward the side of the bar antenna 66. It has a support column mounting portion 64b. For example, the circuit board 64 is attached to the upper end of the column 62 with the bundled bar antenna 66 facing down.

In this structure, since the bar antenna 66 is not in contact with the housing 60, when an impact is applied to the transmission module 4 from the outside, the impact does not directly reach the bar antenna 66, and the support column 62 is bent or the piece It is alleviated by the bending of the circuit board 64 forming the beam structure and the flexibility of the binding band 68, and is transmitted to the bar antenna 66. Therefore, the bar antenna 66 is less likely to be damaged, such as the ferrite bar breaking. That is, since the transmission module 4 has a structure that is resistant to impact, it can be easily handled at the time of installation.

[Second Embodiment]
Of the configurations of the standard radio wave distribution device 1 shown in FIG. 1, the master clock module 2 and the transmission line 6 of the second embodiment are common to those of the first embodiment, and these are related to the first embodiment. The above description can be incorporated. The difference between the second embodiment and the first embodiment lies in the transmission module 4, and the differences will be mainly described below. For convenience of explanation, in the second embodiment, the reference numeral of the transmission module is "4B".

FIG. 8 is a diagram showing a schematic circuit configuration of the transmission module 4B according to the second embodiment. The transmission module 4B includes a bridge circuit 40, a constant voltage regulator 42, a crystal oscillator circuit 80, a control circuit 82, a motor driver 84, a low-pass filter 86, and an antenna 54.

The crystal oscillator circuit 80 generates a multiplied oscillation signal having a common multiple of 40 kHz, which is the first standard frequency, and 60 kHz, which is the second standard frequency. For example, the crystal oscillator circuit 80 generates a 12 MHz clock signal as a multiplication oscillation signal.

The control circuit 82 selects either the first or second standard frequency based on the switching control signal input from the switching signal generation circuit 48, and generates an oscillation signal of the selected standard frequency from the multiplied oscillation signal. It functions as a frequency conversion circuit. For example, the control circuit 82 divides a 12 MHz multiplied oscillation signal by 1/300 to generate an oscillation signal of 40 kHz, and divides it by 1/200 to generate an oscillation signal of 60 kHz. For example, the control circuit 82 is configured by using a microprocessor, and the switching signal generation circuit 48 generates a switching control signal with a voltage representing a logical value by the control circuit 82 and inputs it to the control circuit 82. Specifically, the switching signal generation circuit 48 outputs a predetermined positive voltage representing the logical state “H” when _{φ P} > φ _{Q , and when φ P} <φ _Q , the logical state “H”. Outputs 0V representing "L".

The motor driver 84, the low-pass filter 86, and the antenna 54 are transmission units that convert the oscillation signal output from the control circuit 82, which is a frequency conversion circuit, into radio waves and transmit it. The motor driver 84 amplifies the oscillation signal output by the control circuit 82 to feed the antenna 54. That is, the transmission module 4B uses the motor driver 84 as a drive circuit for the antenna, not for driving the motor. By using the motor driver 84, it is possible to drive the coil-type antenna 54 with a large amount of current in positive and negative polarities, and as a result, the transmission module 4B can output radio waves in a wide range. The motor driver 84 generates a positive oscillation signal and an inverted negative oscillation signal from the input oscillation signal and outputs them in a balanced manner. The low-pass filter 86 is composed of, for example, a CR low-pass filter, removes harmonics that may be included in the oscillation signal output from the bipolar outputs of the motor driver 84, and the antenna 54 receives an oscillation signal from which the harmonics have been removed and receives radio waves. Send as.

The control circuit 82 and the motor driver 84 can be configured by a digital circuit, and by converting the control circuit 82 into an IC, the circuit configuration and the transmission module 4B can be miniaturized.

As in the first embodiment, the constant voltage regulator 42 functions as a power source only during the H level output period of the pulse output means 30. Therefore, the control circuit 82 and the like operate when power is supplied from the constant voltage regulator 42, stop operating when the supply is stopped, and the simulated standard radio wave transmitted from the transmission module 4B is the same as in the first embodiment. It becomes an intermittent wave. FIG. 9 is a flow chart illustrating a schematic operation of the control circuit 82 of the transmission module 4B. When power is supplied from the constant voltage regulator 42, the control circuit 82 enters the power-on state and starts operation (step S40). If the switching control signal from the switching signal generation circuit 48 is H level (in the case of “YES” in step S42), the control circuit 82 divides the clock signal from the crystal oscillation circuit 80 and divides the clock signal to 40 kHz. (Step S44), on the other hand, if the switching control signal is at L level (when "NO" in step S42), the clock signal from the crystal oscillation circuit 80 is divided and an oscillation signal of 60 kHz is output. (Step S46).

Further, the method of connecting the transmission module 4B and the transmission line 6 can be selected from two ways, a forward connection state and a reverse connection state, as in the first embodiment, and a simulated standard transmitted by this method. The frequency of radio waves can be switched.

[Third Embodiment]
In the third embodiment as well, the above description can be incorporated for the components common to the first or second embodiment, and the third embodiment will be referred to as the first and second embodiments below. The differences will be mainly explained.

The standard radio wave distribution device 1 of the first and second embodiments described above outputs an intermittent wave as a simulated standard radio wave from the transmission module 4. That is, the amplitude of the radio wave is set to 0 during the L level period in the master clock module 2. On the other hand, the standard radio wave distribution device 1 of the third embodiment does not set the amplitude of the radio wave in the master clock module 2 during the L level period to 0, and is smaller than the radio wave (signal wave) at the time of H level output. Outputs a residual wave with amplitude. The structural differences corresponding to the functional differences are in the pulse output means 30 of the master clock module 2 and the transmission module 4, and for convenience of explanation, the reference numeral of the pulse output means 30 in the third embodiment is ". It is set to "30C", and the code of the transmission module 4 is set to "4C".

The pulse output means 30C includes a pulse having a pulse width set by the time code bit extraction means 26 (referred to as a positive phase pulse) and a pulse having a phase opposite to that of the positive phase pulse (referred to as a negative phase pulse). It is generated and output from terminals A and B to the transmission line 6.

For example, positive-phase pulse can be the same as the first and second embodiments, the high-potential phi _H next to correspond to H level pulse signal representative of the time code, L level of the pulse signal representing the time code It becomes a low potential φ _{L corresponding to.} In addition, φ _H and φ _L are 24V and 0V also in this embodiment. On the other hand, the reverse phase pulse _{becomes φ L} corresponding to the H level of the pulse signal representing the time code, and becomes _{φ H} corresponding to the L level of the pulse signal representing the time code.

When the direction of the voltage signal output to the transmission line 6 is set forward by the output polarity switching means 28, the pulse output means 30C outputs a positive phase pulse from the terminal A and a negative phase pulse from the terminal B. Output. That is, in the voltage signal from the master clock module 2 to the transmission line 6, the state in which the voltage signal is output corresponding to the H level of the pulse signal representing the time code is set as the first voltage state, and is output corresponding to the L level. Assuming that the state is the second voltage state, in the forward voltage signal, the first voltage state is the state where the terminal A is φ _H and the terminal B is φ _L, and the second voltage state is the state where the terminal A is. It is in a state where φ _L and terminal B are φ _H. In the voltage signal in the opposite direction, the potentials of the terminals A and B are only opposite to those in the forward direction, and a positive phase pulse is output from the terminal B and a negative phase pulse is output from the terminal B. That is, each of the terminals A and B _{becomes φ L} and φ _H in the first voltage state, and φ _H and φ _L in the second voltage state. That is, regardless of whether the voltage signal is in the forward or reverse direction, a potential difference of 24 V _{between φ H} and φ _L is applied between the wires 6a and 6b of the transmission line 6 in both the first and second voltage states. , The constant voltage regulator 42 of the transmission module 4C functions as a power source, and thus the transmission module 4C operates. As a result, the transmission module 4C can generate a residual wave.

FIG. 10 is a diagram showing a schematic circuit configuration of the transmission module 4C according to the third embodiment. The transmission module 4C has a power supply voltage switching circuit 90 in addition to the configuration of the transmission module 4B of the second embodiment shown in FIG.

In the first and second embodiments described above, the amplitude of the radio wave is switched according to the on / off of the constant voltage regulator 42 to obtain an intermittent wave. On the other hand, in the present embodiment, the constant voltage regulator 42 operates in both the first and second voltage states to generate a residual wave, but on the other hand, the constant voltage regulator 42 is turned on / off. The amplitude of the radio wave cannot be switched based on. Therefore, the control circuit 82 constitutes a determination means for determining whether the voltage signal input from the transmission line 6 to the transmission module 4C is in the first or second voltage state, and the radio wave is based on the determination result. Control the amplitude of.

The power supply voltage switching circuit 90 constitutes a transmission means together with the motor driver 84, the low-pass filter 86, and the antenna 54, and the transmission means transmits a signal wave having the first amplitude in the first voltage state as a radio wave of a standard frequency. Then, in the second voltage state, a residual wave having a second amplitude reduced by a predetermined ratio with respect to the first amplitude is transmitted. Specifically, the power supply voltage switching circuit 90 receives a switching control signal according to the determination result from the control circuit 82, and during the period when the determination result is in the first voltage state, for example, the output voltage of the constant voltage regulator 42 is set. The supply voltage to the motor driver 84 is supplied to the motor driver 84, while the supply voltage to the motor driver 84 during the period of the second voltage state is lower than the voltage in the first voltage state. As a result, the oscillation signal input from the control circuit 82 to the motor driver 84 is output to the antenna 54 in the period of the second voltage state with the amplitude smaller than that of the period of the first voltage state, and the residual wave is transmitted. Is realized. By outputting the residual wave according to the specifications of the standard radio wave, the radio-controlled clock can continuously receive the simulated standard radio wave, and the detection waveform obtained by detecting the received signal can also maintain continuity, so that the transmission frequency can be increased. There is no noise generated when intermittent, and stable reception is possible. The second amplitude can be set to 10% of the first amplitude corresponding to the specifications of the standard radio wave described above, but the transmission radio wave output, the reach range, and the reach of the transmission radio wave of the transmission module 4C. It may be adjusted according to the conditions such as the number of shields in the range.

FIG. 11 is a schematic flow chart of operations and processes in the master clock module 2 of the third embodiment. In FIG. 11, the same reference numerals are given to the same operations / processes as those in FIG. 5 described in the first embodiment. In FIG. 11, there is a difference from FIG. 5 in the operation / processing related to the pulse output means 30C. Specifically, in steps S16, S18, S26, S28, S32, and S34 of FIG. 5, only one of terminals A and B is used. While the pulse is not output, in FIG. 11, it is replaced with the steps S16C, S18C, S26C, S28C, S32C, and S34C, which are processes that output the pulse to both the terminals A and B, respectively.

That is, when the set frequency is 40 kHz in steps S14, S24, and S30, the pulse output means 30C outputs a positive phase pulse to the terminal A in steps S16C, S26C, and S32C as in steps S16, S26, and S32, respectively. On the other hand, a reverse phase pulse is further output to the terminal B. Further, when the set frequency is 60 kHz in steps S14, S24, and S30, the pulse output means 30C outputs a positive phase pulse to the terminal B in steps S18C, S28C, and S34C as in steps S16, S26, and S32, respectively. On the other hand, a reverse phase pulse is further output to the terminal A. The pulse width in each case is the same as in the case of FIG.

FIG. 12 is a schematic signal waveform diagram of the voltage signal output from the master clock module 2 of the third embodiment and the radio wave transmitted from the transmission module 4C. The method of expression is the same as that of FIG. 6, and FIGS. 12A and 12B show the case where the voltage signal is in the forward direction and the case where the voltage signal is in the reverse direction, respectively.

When the voltage signal is forward, as shown in FIG. 12A, the pulse output means 30C outputs a positive phase pulse to the terminal A and a negative phase pulse is output to the terminal B. That is, as described above, in the present embodiment, the potentials of terminals A and B are set to 24V and 0V, respectively, during the H level output period of the time code, and the potentials of terminals A and B are set to 0V, respectively, during the L level output period. , 24V. On the other hand, the potential changes of terminals A and B when the voltage signals shown in FIG. 12B are in opposite directions are replaced with those in FIG. 12A, and the positive phase pulse is applied to the terminal B and the negative phase is applied to the terminal A. A pulse is output. That is, the potentials of the terminals A and B are 0V and 24V during the H level output period, and 24V and 0V during the L level output period.

The transmission module 4C transmits a radio wave having a large amplitude during the H level period as a signal wave, and transmits a radio wave having a small amplitude during the L level period as a residual wave. When the transmission module 4C is in the forward connection state, the transmission frequency is set to 40 kHz in the case of a forward voltage signal and 60 kHz in the case of a reverse voltage signal. On the other hand, when the transmission module 4 is in the reverse connection state, the transmission frequency is set to 60 kHz for the forward voltage signal and 40 kHz for the reverse voltage signal.

FIG. 13 is a schematic flow chart relating to the operation of the control circuit 82 of the transmission module 4C. The above-mentioned determination means detects the pulse of the marker M or the position markers P0 to P5 arranged in a predetermined format in the time code based on the change pattern in the voltage signal input to the transmission module 4C, and said that. The voltage state corresponding to the pulse can be determined as the first voltage state, and in the present embodiment, the control circuit 82 detects the pulses of P0 to P5 as the determination means.

Therefore, the control circuit 82 continuously monitors the potential phi _P terminal P based on the switching control signal input from the switching signal generating circuit 48 (step S50). _{When the potential φ P} changes with the switching of the voltage state of the voltage signal from the master clock module 2 (when “YES” in step S50), the control circuit 82 _{relates to the potential φ P} before the change by 0.2. It is determined whether the state of the duration of seconds appears in the cycle of 10 seconds (steps S54, S56, S60, S62). This allows the detection timing of the pulse position marker, it can be seen that the potential phi _P at that time represents the first voltage state of the voltage signal.

_{Specifically, if φ P} after the change is φ _L (when “YES” in step S52), _{the time width of the state of φ P} = φ _H immediately before that is 0.2 seconds, and further. _{If the elapsed time from the detection of the state of φ P} = φ _{H having} a width of 0.2 seconds before that is 10 seconds (when “YES” in steps S54 and S56), φ _P = φ _H is a voltage signal. Corresponds to the first voltage state of. This is the case where the transmission module 4C is in the forward connection state for the forward voltage signal or the transmission module 4C is in the reverse connection state for the reverse voltage signal. In this case, the control circuit 82 is a simulated standard. The first standard frequency (40 kHz) is selected as the frequency of the radio wave, the frequency of the output clock generated by dividing the clock from the crystal oscillation circuit 80 is set to 40 kHz, and the output clock is sent to the motor driver 84 as an oscillation signal. (Step S58).

On the other hand, _{if φ P} after the change is φ _H (when “NO” in step S52), _{the time width of the state of φ P} = φ _L immediately before that is 0.2 seconds, and the previous time is 0. _{If it is 10 seconds from the detection of the state of φ P} = φ _{L having} a width of 2 seconds (when “YES” in steps S60 and S62), φ _P = φ _L corresponds to the first voltage state. This is a case where the transmission module 4C is in the reverse connection state with respect to the forward voltage signal or the forward connection state with respect to the reverse voltage signal, and the control circuit 82 has a second standard frequency as the frequency of the simulated standard radio wave. (60 kHz) is selected, the frequency of the output clock is set to 60 kHz, and the output clock is supplied to the motor driver 84 (step S64).

Here, if the timing of the position marker cannot be detected (when "NO" in steps S54, S56, S60, S62), the standard frequency is not set. In this case (when "NO" in step S66), the control circuit 82 repeats the process from step S50.

On the other hand, when the standard frequency is set in step S58 or S64 (when “YES” in step S66), the control circuit 82 depends on the determination result of whether it is the first voltage state or the second voltage state. While switching the amplitude, the process of transmitting the simulated standard radio wave at the set standard frequency (steps S70 to S82) is started. To switch the amplitude, the control circuit 82 sends a switching control signal to the power supply voltage switching circuit 90 according to the determination result, and determines whether the output voltage of the power supply voltage switching circuit 90 is set to a predetermined high voltage or a predetermined low voltage. It is done by switching.

Specifically, the control circuit 82 uses _{the power supply voltage switching circuit 90 during the period when φ P} is φ _H (when “YES” in step S70) when the set frequency is 40 kHz (step S72). If the set frequency is set to the high voltage side (step S74) and the set frequency is 60 kHz (step S72), the power supply voltage switching circuit 90 is set to the low voltage side (step S76). Further, _{during the period when φ P} is φ _L (when “NO” in step S70), if the set frequency is 40 kHz (step S78), the power supply voltage switching circuit 90 is set to the low voltage side (step). S80), if the set frequency is 60 kHz (step S78), the power supply voltage switching circuit 90 is set to the high voltage side (step S82).

Steps S70 to S82 are repeated in a loop process, and the amplitude is switched each time _{φ P is switched.} As a result, a simulated standard radio wave corresponding to the time code generated by the master clock module 2 is generated.

[Modification example]
(1) In the first embodiment, the first and second voltage states of the voltage signal are states in which the voltages between the terminals A and B are 24V and 0V, respectively. In the third embodiment, the first and second voltage states of the voltage signal are not limited to that example.

For example, in the first and second embodiments, the first voltage state may be a voltage equal to or higher than the threshold value at which the transmission modules 4 and 4B operate, and the second voltage state may be a voltage lower than the threshold value. Often, this causes the transmit modules 4 and 4B to operate when the voltage signal is in the first voltage state and transmit radio waves of standard frequency, while stopping operation when the voltage signal is in the second voltage state. The same configuration as described above can be obtained.

Further, in the third embodiment, for example, in a forward voltage signal, the first voltage state is set to the state of the potential φ _A1 = 24V of the terminal A and the potential φ _B1 = 0V of the terminal B, and the second voltage. An example has been described in which the state is the state where the potential φ _A2 = 0 V of the terminal A and the potential φ _{B2 = 24 V of the terminal B.} However, not limited to this example, if the potential difference | φ _A1- φ _B1 | and | φ _A2- φ _B2 | are voltages equal to or higher than the threshold value at which the transmission module 4C operates, the residual wave described in the third embodiment is used. A configuration that outputs is feasible.

(2) In the third embodiment, φ _A1 = φ _B2 and φ _A2 = φ _B1. Inversion of the direction (forward and reverse) of the voltage signal and the connection state of the transmission module 4C to the transmission line 6 ( The potential relationship of the voltage signal is symmetric with respect to the inversion of the forward connection state and the reverse connection state). Therefore, the transmission module 4C determines the first voltage state based on the change pattern of the voltage signal without relying on the potential relationship of the voltage signal, and switches the amplitude of the transmitted radio wave.

However, if, for example, φ _A1 ≠ φ _B2 is set so that the potential relationship of the voltage signal is asymmetric between the first voltage state and the second voltage state, the transmission module 4C determines from the potential relationship. It is possible to determine the potential state of 1. That is, in the third embodiment, the determination means for determining whether the voltage signal input to the transmission module is in the first or second voltage state is configured not to rely on the change pattern of the voltage signal. Therefore, it is possible to realize the standard radio wave distribution device 1 that transmits the residual wave described in the third embodiment by using the determination means.

(3) In the above embodiment, as the standard frequency and time code transmitted by the standard radio wave distribution device 1, the standard radio wave in Japan has been described as an example, but the present invention is not particularly limited to this, and for example, WWVB (US 60 kHz), etc. Standard frequencies and timecodes from other countries, such as DCF77 (Germany 77.5 kHz), may be used. In recent years, many radio-controlled clocks can receive not only Japanese standard radio waves but also multiple types of standard radio waves such as WWVB and DCF77. Therefore, the standard radio wave distribution device 1 transmits a plurality of types of simulated standard radio waves. A possible configuration may be made, and the plurality of types of simulated standard radio waves may be switched and transmitted according to the radio wave noise environment of the transmission module 4.

1 standard radio wave distribution device, 2 master clock module, 4 transmission module, 6 transmission line, 6a, 6b electric wire, 8 radio clock, 20 receiving means, 22 time adjusting means, 24 internal clock measuring means, 26 time code bit extracting means, 28 Output polarity switching means, 30 pulse output means, 40 bridge circuit, 42 constant voltage regulator, 44 40 kHz oscillator circuit, 46 60 kHz oscillator circuit, 48 switching signal generation circuit, 50 analog switch, 52 amplifier circuit, 54 antenna, 60 housing , 62 columns, 64 circuit boards, 66 bar antennas, 68 cohesion bands, 80 crystal oscillator circuits, 82 control circuits, 84 motor drivers, 86 low pass filters, 90 power supply voltage switching circuits.

Claims (10)

A standard radio wave distribution device that receives time information from the master clock module and transmits simulated standard radio waves that imitate standard radio waves from a transmission module connected to the master clock module via a transmission line.
The master clock module generates a time code in a format used for the standard radio wave based on the time information, and becomes a first voltage state corresponding to a high level of a pulse signal representing the time code and becomes a low level. Correspondingly, a voltage signal that becomes the second voltage state is generated,
The transmission line is a pair of electric wires, and transmits the voltage signal applied between the two electric wires.
The transmission module includes a pair of input terminals connected to the transmission line and to which the voltage signal is applied, operates using the voltage between the input terminals as a power source, and uses radio waves of a standard frequency as the simulated standard radio waves. Transmission by switching the amplitude of the voltage signal according to the voltage state.
A standard radio wave distribution device characterized by. In the standard radio wave distribution device according to claim 1,
The first voltage state is a voltage equal to or higher than the threshold value at which the transmission module operates, and the second voltage state is a voltage lower than the threshold value.
The transmission module operates when the voltage signal is in the first voltage state to transmit radio waves of the standard frequency, while it stops operation when the voltage signal is in the second voltage state.
A standard radio wave distribution device characterized by. In the standard radio wave distribution device according to claim 2,
When the first input terminal has a higher potential than the second input terminal in the first voltage state, the transmission module transmits a radio wave whose standard frequency is the first standard frequency. On the other hand, a standard radio wave distribution device comprising transmitting a radio wave having a second standard frequency when the second input terminal has a higher potential than the first input terminal. In the standard radio wave distribution device according to claim 3,
The transmission module
The first oscillation circuit that generates the oscillation signal of the first standard frequency and
The second oscillation circuit that generates the oscillation signal of the second standard frequency and
A switching signal generation circuit that generates a switching control signal according to the height relationship between the first input terminal and the second input terminal, and
A switching unit that switches whether to output the oscillation signal input from each of the first oscillation circuit and the second oscillation circuit based on the switching control signal.
A transmission unit that converts the oscillation signal output from the switching unit into radio waves and transmits it.
A standard radio wave distribution device characterized by having. In the standard radio wave distribution device according to claim 3,
The transmission module
An oscillator circuit that generates a multiplied oscillation signal having a common multiple of the first standard frequency and the second standard frequency,
A switching signal generation circuit that generates a switching control signal according to the height relationship between the first input terminal and the second input terminal, and
A frequency conversion circuit that selects either the first or second standard frequency based on the switching control signal and generates an oscillation signal of the selected standard frequency from the multiplication oscillation signal.
A transmitter that converts the oscillation signal output from the frequency conversion circuit into radio waves and transmits it.
A standard radio wave distribution device characterized by having. In the standard radio wave distribution device according to claim 1,
Both the first and second voltage states are voltages equal to or higher than the threshold value at which the transmission module operates.
The transmission module
A determination means for determining whether the input voltage signal is in the first or second voltage state, and
A radio wave of the standard frequency is transmitted with a first amplitude in the first voltage state, and is transmitted with a second amplitude obtained by subtracting a predetermined ratio from the first amplitude in the second voltage state. Means and
A standard radio wave distribution device characterized by having. In the standard radio wave distribution device according to claim 6,
The determination means detects a pulse of a marker or a position marker arranged in a predetermined format in the time code based on the change pattern in the voltage signal, and determines the voltage state corresponding to the pulse in the first. To determine the voltage status of
A standard radio wave distribution device characterized by. In the standard radio wave distribution device according to claim 7,
The transmitting means sets the standard frequency to the first standard frequency when the first input terminal has a higher potential than the second input terminal in the first voltage state, while the transmitting means sets the standard frequency to the first standard frequency. When the second input terminal has a higher potential than the first input terminal in the first voltage state, the standard frequency is set to the second standard frequency.
A standard radio wave distribution device characterized by. In the standard radio wave distribution device according to any one of claims 3 to 5, and 8.
The master clock module is a standard radio wave distribution device, characterized in that it has an output polarity switching means for switching whether or not to invert the direction of applying the voltage signal to the transmission line. In the standard radio wave distribution device according to any one of claims 1 to 9.
The transmission module
With the housing
The columns erected on the inner surface of the housing and
A circuit board attached to the support column and supported away from the inner surface of the housing,
A bar antenna that is tied to the circuit board and supported away from the inner surface of the housing.
A standard radio wave distribution device characterized by having.

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