JP2000354013A - Reception tester for long standard radio wave - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive radio wave tester, which can discriminate whether a reception circuit can receive radio waves containing time code information composed of 1 Hz pulse signals. SOLUTION: A reception circuit 1 receives radio waves containing time code information composed of 1 Hz pulse signals and which upon detecting the 1 Hz pulse signals, outputs the detected 1 Hz pulse signals. The pulse signals are inverted by means of a transistor 3 and a resistor 4, differentiated by means of a differentiation circuit 9, and inputted to the base of a transistor 8. The transistor 8 is turned on by the output of the differentiation circuit 9 which is outputted synchronously to the rise of the detected 1 Hz pulse signals, and a piezoelectric buzzer 14 notifies the turning-on of the circuit 9. In a good reception environment, the buzzer 14 regularly buzzes at one-second intervals, but in a poor reception environment, it does not buzz regularly at one-second intervals.

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tester for receiving a long-wave standard radio wave including time code information consisting of a pulse signal transmitted every second.

2. Description of the Related Art At present, in Japan, a time code is superimposed on a long-wave standard radio wave and transmitted under the jurisdiction of the Ministry of Posts and Telecommunications. This signal transmits time data such as the number of accumulated days, hour, minute, etc. from January 1 in binary code in a one minute cycle. Specifically, 1 bit is 1H
A rectangular pulse of z is used, and the weighting of "1" and "0" is represented by setting the pulse width to 500 ms and 800 ms, respectively. Further, a 200 ms pulse is used as a position marker and 40 kHz is used as a carrier. In a clock that adjusts the time by this radio wave, a home appliance or an OA device equipped with such a clock, a power supply is supplied to a receiving circuit for a certain time from a certain time every day and a signal having this time information is supplied. Is received, and the time is adjusted when the reception is correctly performed. When using such devices and the like, it is necessary to check the radio wave condition at the place where those devices are installed and to confirm whether or not the devices can be used. The reason for this is that even if you buy a device whose time can be adjusted by radio waves, if you cannot receive the radio wave containing the time code at the place where you use it, the device may be wasted. Because. As a cause of the place where the radio wave cannot be received, the electric field strength of the radio wave becomes weak in inverse proportion to the distance from the transmitting station. It can be considered. In addition, the influence of city noise as a background, noise from home electric appliances such as air conditioners, televisions, fluorescent lamps, etc., and OA appliances such as personal computers and faxes can be considered.

However, in order to carry out the above investigation, a very expensive measuring instrument such as a field strength meter had to be used. In addition, specialized knowledge was required to determine whether the radio waves could be received.

According to the present invention, there is provided a receiving section for receiving a long-wave standard radio wave including time code information comprising a 1-Hz pulse signal, and detecting the pulse signal from the received radio wave; And a means for notifying the existence of the pulse signal. Therefore, it is possible to easily check whether or not a long-wave standard radio wave including time code information composed of a pulse signal transmitted every second can be received with an inexpensive configuration. Therefore,
It is not necessary to use a very expensive measuring instrument such as a field strength meter as in the related art. Further, it is possible to solve the problem of requiring specialized knowledge to determine whether the radio wave can be received. The converting means converts the detected pulse signal into a pulse having a desired pulse width, and performs notification for a time corresponding to the pulse width of the pulse signal converted into the pulse having the desired pulse width. The notification unit is included. Therefore, the same problem as described above can be solved, and the notification is performed for a time corresponding to the pulse width of the pulse signal converted into the pulse having the desired pulse width. Can be improved.
For example, when the notification is performed for a time corresponding to the pulse width of the detected pulse signal, the length of the notification sound varies, and the possibility of making an erroneous determination due to the variation can be eliminated. The conversion circuit, a differentiation circuit for differentiating a signal corresponding to the detected pulse signal, and the desired signal in response to an output signal output in synchronization with a rise of the pulse signal among output signals of the differentiation circuit. And a pulse output circuit that outputs a pulse having a pulse width. Therefore, the same problem as described above can be solved with a simple configuration, and the notification time can be shortened as compared with a case where the notification is performed for a time corresponding to the pulse width of the detected pulse signal, and power saving can be achieved. That is, an increase in power consumption can be prevented. Since the notification unit includes the piezoelectric buzzer and a drive circuit for driving the piezoelectric buzzer, malfunction due to the influence of electromagnetic noise that occurs when, for example, an electromagnetic horn or an electromagnetic buzzer is used as the notification unit is eliminated. Since the means is to notify the presence of the detected pulse signal by the notification of the piezoelectric buzzer,
For example, a malfunction due to the influence of electromagnetic noise generated when an electromagnetic horn or an electromagnetic buzzer is used as the notification unit is eliminated. 1H including position markers generated at 10 second intervals
a receiving unit for receiving a long-wave standard radio wave including time code information composed of a pulse signal of z, and detecting the pulse signal from the received radio wave, in synchronization with the rise of the pulse signal in accordance with the detection of the position marker A notification unit that performs notification with the first sound and performs notification with a second sound different from the first sound in synchronization with the rise of the pulse signal in response to detection of a pulse different from the position marker. I have. Therefore, it is possible to easily check whether or not a long-wave standard radio wave including time code information composed of a pulse signal transmitted every second can be received with an inexpensive configuration. Therefore, it is not necessary to use a very expensive measuring instrument such as a field strength meter as in the related art. Further, it is possible to solve the problem of requiring specialized knowledge to determine whether the radio wave can be received. Also, if the reception environment is good, the first sound different from the second sound is generated every 10 seconds, so that the sound is sharper than when the same sound is sounded every second. It becomes easy to determine. For example, different sounds are output in the same cycle when compared with the telephone time signal service of 117, so that it is easier to determine. Therefore, sharpness that occurs when only the same sound is notified can be eliminated. The notification unit may notify the first sound and the second sound by notification of a piezoelectric buzzer.

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present application is
A receiving unit for receiving a long-wave standard radio wave including time code information composed of a pulse signal of 1 Hz and detecting the pulse signal from the received radio wave, and a unit for notifying the presence of the detected pulse signal. I have. The invention according to claim 2 of the present application is the invention according to claim 1, wherein the means converts the detected pulse signal into a pulse having a desired pulse width and a conversion circuit for converting the detected pulse signal into a pulse having a desired pulse width. And a notification unit that performs notification for a time corresponding to the pulse width of the pulse signal. The invention according to claim 3 of the present application is the invention according to claim 2, wherein the conversion circuit includes a differentiation circuit that differentiates a signal corresponding to the detected pulse signal,
And a pulse output circuit that outputs a pulse having the desired pulse width in accordance with an output signal output in synchronization with a rise of the pulse signal among output signals of the differentiation circuit. The invention according to Claim 4 of the present application is Claim 2
In 3 or 3, the notification unit includes a piezoelectric buzzer and a drive circuit for driving the piezoelectric buzzer. In the invention according to claim 5 of the present application, in claim 1, the means notifies the presence of the detected pulse signal by notification of a piezoelectric buzzer. The invention according to claim 6 of the present application receives a long-wave standard radio wave including time code information composed of a 1-Hz pulse signal including a position marker generated at an interval of 10 seconds, and detects the pulse signal from the received radio wave. A receiving unit for receiving a first signal in synchronization with a rise of the pulse signal upon detection of the position marker;
And a notifying unit for notifying by a second sound different from the first sound in synchronization with the rise of the pulse signal upon detection of a pulse different from the position marker. In the invention according to claim 7 of the present application, in claim 6, the notification section notifies the first sound and the second sound by notification of a piezoelectric buzzer.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to one embodiment shown in the drawings. In FIG. 1, a receiving circuit 1 as a receiving unit includes an antenna, an amplifier, a filter, an integrator,
A radio wave comprising a comparator and the like, and under the jurisdiction of the Ministry of Posts and Telecommunications, receiving a radio wave in which time code information composed of a pulse signal of 1 Hz is superimposed on a long-wave standard radio wave,
z pulse signal is detected, and the detected pulse signal is
, And output to the base of the transistor 3. The emitter of the transistor 3 is connected to the low potential side of the power supply, and the collector is connected to the high potential side of the power supply via the resistor 4 and also to one end of the capacitor 5. The other end of the capacitor 5 is connected to the high potential side of the power supply via a resistor 6 and to the base of a transistor 8 as a pulse output circuit via a resistor 7. The differentiating circuit 9 is composed of the capacitor 5 and the resistor 6. The emitter of the transistor 8 is connected to the high potential side of the power supply,
Its collector is connected to the base of transistor 12 through a series circuit of resistors
To the collector of the transistor 12.
The emitter of the transistor 12 is connected to the low potential side of the power supply. The piezoelectric buzzer 14 uses a three-terminal self-excited type element. The common electrode 14a is connected to the emitter of the transistor 12, the main electrode 14b is connected to the collector of the transistor 12, and the feedback electrode 14c is connected to the resistors 10 and 1.
Connected to one contact. As described above, since the piezoelectric buzzer is used for notification, a malfunction due to the influence of electromagnetic noise that occurs when an electromagnetic horn or an electromagnetic buzzer is used is eliminated. In addition, since only one type of sound is emitted in this example as described later, a self-excited type element is particularly used. In this case, an external oscillation circuit can be unnecessary, and a configuration that occurs when an external oscillation circuit is used is used. Enlargement can be prevented. If there is room in the configuration, a separately excited type element may be used as the piezoelectric buzzer. Note that the resistor 2, the transistor 3, the resistor 4, the capacitor 5, the resistor 6, the resistor 7, the transistor 8, the resistor 10, the resistor 11, and the transistor 1
2. A means 15 for notifying the presence of the pulse signal detected by the receiving circuit 1 by the resistor 13 and the piezoelectric buzzer 14 is provided.
The conversion circuit 16 is composed of the resistor 2, the transistor 3, the resistor 4, the capacitor 5, the resistor 6, the resistor 7, and the transistor 8, and the resistors 10, 11, 11, 12, and 13
And a piezoelectric buzzer 14 to constitute the notification unit 17,
The drive circuit 18 is composed of 0, the resistor 11, the transistor 12, and the resistor 13. Next, the operation will be described with reference to FIG. Under the jurisdiction of the Ministry of Posts and Telecommunications, for example, a radio wave as shown in FIG. It is assumed that Under the environment that can receive this radio wave well,
For example, in an environment where the influence of noise is small, the receiving circuit 1 receives a radio wave shown in FIG. 2A and outputs a pulse signal synchronized with FIG. 2A as shown in FIG. 2B. Note that the pulse width of the pulse signal is the same as the pulse width of the pulse superimposed on the radio wave. Since the transistor 3 is turned on every time a pulse is output from the receiving circuit 1, the voltage signal generated at the collector of the transistor 3
Is inverted from the pulse output from. The voltage signal generated at the collector of the transistor 3 is differentiated by the differentiating circuit 9 and input to the base of the transistor 8 via the resistor 7. Since the differentiating circuit 9 differentiates the inverted signal of the pulse output from the receiving circuit 1, the output timing is the same as when the pulse output from the receiving circuit 1 is differentiated. This is the same as differentiating the pulse output from the circuit 1. Since the transistor 8 is turned on only when a low-potential signal is input to its base, the transistor 8 is turned on only when a signal output from the differentiating circuit 9 is input at a timing synchronized with the rise of the pulse signal output from the receiving circuit 1. The on-time is defined by the capacitance of the capacitor 5 and the resistance of the resistor 6 constituting the differentiating circuit 9. That is, the transistor 8
Can be set to a desired value depending on how the capacitance of the capacitor 5 and the resistance of the resistor 6 are set. Further, since the ON time of the transistor 8 is specified by using the differentiating circuit 9, the ON time can be shorter than the pulse width of the pulse signal from the receiving circuit 1. In this example,
The on-time of the transistor 8 is set to about 100 ms. The ON time can be changed as appropriate. When the transistor 8 is turned on, power is supplied to the notification unit 17 and the piezoelectric buzzer 14 emits a sound. FIG. 2c shows the voltage waveform at the terminal c of FIG. 1, and as can be seen from a comparison with FIG. 2b,
The pulse shown in FIG. 2C is generated in synchronization with the rise of the pulse as shown in FIG. 2B, and its pulse width has a constant value independent of the pulse width of the pulse shown in FIG. 2B. Therefore, in an environment in which radio waves can be satisfactorily received, the same sound as a beep, beep, beep, etc. continues at accurate one-second intervals in synchronization with the rise of a 1-Hz pulse. The sound emitted by the piezoelectric buzzer 14 is not limited to a beep, beep, and can be changed as appropriate. On the other hand, in a place where the influence of noise is large or a radio wave is weak, a pulse signal at one-second intervals is not output from the receiving circuit 1 and the transistor 3 is not turned on. The sound is not notified from the buzzer 14 or the sound is emitted at intervals longer than one second. In an environment where noise is dominant, sounds are emitted at irregular intervals. As described above, it is possible to easily determine whether or not the location can receive the radio wave based on the state of the sound notified from the piezoelectric buzzer 14. Further, when making such a determination, it is possible to instantly and easily determine whether or not those sounds can be heard synchronously when compared with, for example, a telephone time signal service of 117 or the like.
In addition, the pulse width is not the pulse width of the pulse signal transmitted every second contained in the radio wave but the pulse width of the pulse signal having a desired pulse width (in this example, a pulse width of about 100 ms) converted from the pulse width. Since the piezoelectric buzzer 14 is driven during the time, the variation of the notification sound is reduced, and the accuracy of the determination can be improved. For example, if the notification is performed for a time corresponding to the pulse width of the detected pulse signal, the length of the notification sound varies, and the possibility of erroneous determination due to the variation in the length of the sound is reduced. Can be resolved. In the case where the simplification of the configuration is prioritized over the possibility of erroneous determination, the notification may be performed for a time corresponding to the pulse width of the detected pulse signal. Also in this case, the reception state can be determined based on whether or not a sound is generated in synchronization with the rise of the detected pulse signal. In addition, since the piezoelectric buzzer is operated by using a pulse having a pulse width smaller than the pulse width of the pulse signal transmitted every second, for example, the notification is performed for a time corresponding to the pulse width of the detected pulse signal. The notification time can be shortened as compared with the case of performing, and power saving can be achieved. That is, an increase in power consumption can be prevented. In the above example, the presence of the pulse signal detected by the receiving circuit 1 is notified using the piezoelectric buzzer. However, the present invention is not limited to the piezoelectric buzzer, and a viewing angle display device such as an LED may be used. Can be changed. In addition, since the above-described configuration enables a compact configuration, it is easy to carry. Also,
There is no need to detect the strength of radio waves as in a field strength meter,
Since the reception frequency is fixed, the cost can be reduced. In the above description, the same sound is emitted when detecting individual pulses. However, an example in which a different sound is emitted when a position marker output at 10-second intervals is detected next will be described. The same components as those in FIG. 1 are denoted by the same reference numerals. In FIG. 3, a frequency dividing circuit 19 divides a fundamental frequency signal output from an oscillation circuit 20 into a 1 kHz clock signal. The counter 21 is an 8-bit binary counter. The counter 21 is enabled while the output of the receiving circuit 1 is "1". During this time, the 1 kHz clock signal of the frequency dividing circuit 19 is counted.
Is output. Therefore, the carry signal (Co) from the counter 21 is not output when the receiving circuit 1 detects a position marker having a pulse width of 200 ms, but is output when other pulses having a pulse width of 500 ms or 800 ms are detected. . The control circuit 22 stores the carry signal (Co), detects the rise of the pulse signal output from the receiving circuit 1, clears the counter 21 in response to the detection, and operates the drive circuit 23 at the same timing. An operation signal (ST) and a selection signal (SEL) instructing the operation content are output to the drive circuit 23. As the operation signal (ST) and the selection signal (SEL), a carry signal (Co) is output when the previous pulse is detected, and when the control circuit 22 stores the carry signal (Co), the operation signal (ST) of 200 ms and “ When the carry signal (Co) is not output when the previous pulse is detected and the control circuit 22 does not store the carry signal (Co), the operation signal (ST) of 800 ms is output. ) And a selection signal (SEL) of “1”. The control circuit 22 is 1
After detecting the state of the carry signal (Co) at the time of the previous pulse detection, the storage area of the carry signal (Co) is cleared, and the carry signal (C) at the time of the current pulse detection is detected.
The presence or absence of o) is stored. The drive circuit 23 outputs an operation signal (S
T), a piezoelectric buzzer (separately excited type element) 24 as a sounding body is operated for a time corresponding to the length of the selection signal (SEL) when the selection signal (SEL) is "1".
L) is a pitch different from the sound emitted when “0” (for example,
When the selection signal (SEL) is “0”, driving is performed at a frequency of 1 kHz, and when the selection signal (SEL) is “1”, driving is performed at a frequency of 2 kHz. ). Note that this drive frequency can be changed as appropriate. Note that the frequency dividing circuit 19, the oscillation circuit 20, the counter 21, the control circuit 22, the driving circuit 2
3. The notification unit 25 is constituted by the piezoelectric buzzer 24. As described above, if the reception environment is good, the length of the sound is different from the normal time in units of 10 seconds, and the notification with the different pitch is performed. For example,
Compared with the telephone time signal service of 117, different sounds are output in the same cycle, which makes it easier to determine. Therefore, sharpness that occurs when only the same sound is notified can be eliminated. In the above description, when the position marker is detected, both the sound length and the pitch are changed. However, different sounds may be generated by changing either one of them.

According to the present invention, a receiving section for receiving a long-wave standard radio wave including time code information composed of a 1-Hz pulse signal and detecting the pulse signal from the received radio wave; It is a long-wave standard radio wave reception tester including means for notifying the existence. Therefore, it is possible to easily check whether or not a long-wave standard radio wave including time code information composed of a pulse signal transmitted every second can be received with an inexpensive configuration. Therefore, it is not necessary to use a very expensive measuring instrument such as a field strength meter as in the related art. Further, it is possible to solve the problem of requiring specialized knowledge to determine whether the radio wave can be received. The converting means converts the detected pulse signal into a pulse having a desired pulse width, and performs notification for a time corresponding to the pulse width of the pulse signal converted into the pulse having the desired pulse width. The notification unit is included. Therefore, the same problem as described above can be solved, and the notification is performed for a time corresponding to the pulse width of the pulse signal converted into the pulse having the desired pulse width. Can be improved. For example, when the notification is performed for a time corresponding to the pulse width of the detected pulse signal, the length of the notification sound varies, and the possibility of making an erroneous determination due to the variation can be eliminated.
The conversion circuit, a differentiation circuit for differentiating a signal corresponding to the detected pulse signal, and the desired signal in response to an output signal output in synchronization with a rise of the pulse signal among output signals of the differentiation circuit. And a pulse output circuit that outputs a pulse having a pulse width. Therefore, the same problem as described above can be solved with a simple configuration, and the notification time can be shortened as compared with a case where the notification is performed for a time corresponding to the pulse width of the detected pulse signal, and power saving can be achieved. That is, an increase in power consumption can be prevented. Since the notification unit includes the piezoelectric buzzer and a drive circuit for driving the piezoelectric buzzer, malfunction due to the influence of electromagnetic noise that occurs when, for example, an electromagnetic horn or an electromagnetic buzzer is used as the notification unit is eliminated. Since the above-mentioned means notifies the presence of the detected pulse signal by the notification of the piezoelectric buzzer, a malfunction due to the influence of electromagnetic noise, which occurs when an electromagnetic horn or an electromagnetic buzzer is used as the notification unit, is eliminated. A receiving unit that receives a long-wave standard radio wave including time code information including a 1 Hz pulse signal including a position marker generated at 10-second intervals, and detects the pulse signal from the received radio wave; Along with the rise of the pulse signal, the first sound is notified in synchronization with the rise of the pulse signal, and a second sound different from the first sound is synchronized with the rise of the pulse signal in response to the detection of a pulse different from the position marker. And a notification unit for performing notification. Therefore, it is possible to easily check whether or not a long-wave standard radio wave including time code information composed of a pulse signal transmitted every second can be received with an inexpensive configuration. Therefore,
It is not necessary to use a very expensive measuring instrument such as a field strength meter as in the related art. Further, it is possible to solve the problem of requiring specialized knowledge to determine whether the radio wave can be received. If the receiving environment is good, the second
Since the first sound different from the first sound is generated, the sound is sharper than in the case where the same sound is sounded every second, and the sound is more easily distinguished. For example, different sounds are output in the same cycle when compared with the telephone time signal service of 117, so that it is easier to determine. Therefore, sharpness that occurs when only the same sound is notified can be eliminated. The notification unit may notify the first sound and the second sound by notification of a piezoelectric buzzer.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing one embodiment of the present invention.

FIG. 2 is a timing chart showing the operation of FIG.

FIG. 3 is a block circuit diagram showing another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Receiving part 8 Pulse output circuit 9 Differentiating circuit 14 Piezoelectric buzzer 15 Means which notifies the existence of the detected pulse signal 16 Conversion circuit 17 Notification part 18 Drive circuit 25 Notification part

Claims (7)

[Claims] 1. A receiving unit for receiving a long-wave standard radio wave including time code information composed of a 1-Hz pulse signal, detecting the pulse signal from the received radio wave, and notifying the presence of the detected pulse signal. Means for receiving a long wave standard radio wave. 2. The apparatus according to claim 1, wherein said means converts the detected pulse signal into a pulse having a desired pulse width, and a pulse of the pulse signal converted into a pulse having the desired pulse width. And a notifying unit for notifying for a time corresponding to the width. 3. The differentiation circuit according to claim 2, wherein the conversion circuit differentiates a signal corresponding to the detected pulse signal, and outputs the signal in synchronization with a rise of the pulse signal among output signals of the differentiation circuit. And a pulse output circuit for outputting a pulse having the desired pulse width in accordance with the output signal to be received. 4. The reception tester according to claim 2, wherein the notifying unit includes a piezoelectric buzzer and a driving circuit for driving the piezoelectric buzzer. 5. The tester according to claim 1, wherein the means notifies the presence of the detected pulse signal by notification of a piezoelectric buzzer. 6. A receiving unit for receiving a long-wave standard radio wave including time code information composed of a 1-Hz pulse signal including a position marker generated at an interval of 10 seconds and detecting the pulse signal from the received radio wave; Along with the detection of the position marker, the first sound is notified in synchronization with the rise of the pulse signal, and
A notification unit for performing notification with a second sound different from the first sound in synchronization with a rise of the pulse signal in response to detection of a pulse different from the position marker. . 7. The reception tester according to claim 6, wherein the notifying unit notifies the first sound and the second sound by notifying a piezoelectric buzzer.