JPH06314396A - Transmitter receiver - Google Patents

Abstract

PURPOSE:To reduce the influence of disturbance even with low output power, to eliminate erroneous counting, and to improve the reliability by converting an inputted signal into a pulse signal consisting of repetition of plural pulse waveform differing in pulse width, and sending and receiving it. CONSTITUTION:A reed switch 9 makes its contact point ON when a magnet 5 approaches the read switch 9 to generate a pulse signal and serves as a signal input means which inputs a signal based upon the rotation of a wheel. A signal generating means 10 generates a pulse wave made to correspond to individual signals appearing successively from the reed switch 9 and this pulse wave is converted into the pulse signal consisting of pulse waveforms which differ in pulse width and become repetition in specific order. The pulse signal generated by the signal generating means 10 is sent by radio from an output antenna 12 through a transmitting circuit 11 and the pulse signal which is transmitted by radio is received in order and converted into data that a man senses.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmitting / receiving device. More specifically, the present invention relates to a wireless transmission / reception device suitable for signal processing of a bicycle speedometer.

[0002]

2. Description of the Related Art In recent years, in order to easily know the traveling speed and traveling distance of a bicycle, a speedometer is sometimes attached to a position such as a steering wheel of a bicycle where the driver can easily see. A conventional speedometer is disclosed in, for example, JP-A-57-14996.
As shown in Publication No. 7, the hawk has a rotation sensor,
The speedometer body is attached to the handle via a bracket, and the sensor and the bracket are electrically connected by a cord or the like. In such a speedometer, the signal generated by the rotational movement of the front wheel of the bicycle is input to the speedometer via a code, and the traveling speed of the bicycle is calculated based on the input signal and displayed. There is.

[0003]

In the cord type speedometer, the cord is wired along the forks, so that it takes time to mount the cord. Also, cord breakage accidents are likely to occur due to vibrations or shocks associated with traveling. In addition, the cord has to be removed from the frame when the bicycle is disassembled and carried around, which is inconvenient.

In order to solve such a drawback of the cord type speedometer, it is possible to wirelessly transmit a signal from the rotation sensor to the speedometer main body. However, since it does not take much space to install a power supply for bicycles, even if a wireless speedometer is adopted for bicycles, it will be transmitted by a low output transmission unit and a low output and high sensitivity reception unit. Must receive. However, with such a configuration, the SN ratio of the received signal is reduced with respect to external noise, and spark noise of an engine such as an automobile or noise from a railroad crossing gate is externally applied while running a bicycle or the like. In addition, there is a problem that noise due to electromagnetic waves from a motor or the like is input and an erroneous signal is easily generated. For example, the rotation signal is output as one pulse signal for each rotation of the bicycle wheel. The receiving unit side counts the number of times this pulse signal is generated, and the traveling speed and traveling distance of the bicycle are calculated based on this count value. However, when noise due to electromagnetic waves that generates a signal similar to this pulse signal is input to the receiving unit, this pseudo signal is easily counted as a regular pulse signal. As a result, it is impossible to accurately calculate and display the traveling speed or the traveling distance.

Such a problem is applicable not only to the speedometer for bicycles but also to all wireless transmission / reception devices which must be used under the above conditions.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a wireless transmission / reception device which is less likely to be affected by a pseudo pulse signal due to a disturbance easily generated from an engine, a motor, or the like.

[0007]

A wireless transmission / reception apparatus of the present invention generates a signal input means for continuously inputting a signal and a pulse wave corresponding to each signal input by the signal input means. And a signal generating means for generating a pulse signal in which the pulse wave is repeated in a predetermined order with different pulse widths, a wireless transmitting means for continuously wirelessly transmitting the pulse signal, and the wirelessly transmitted pulse It comprises a receiving means for sequentially receiving signals and a control means for converting the received pulse signals into data that can be perceived by humans.

[0008]

According to the present invention, an input signal is converted into a pulse signal composed of a repetition of a plurality of pulse waveforms having different pulse widths, and the pulse signal is transmitted / received. Therefore, even if other pseudo pulse signals are mixed. Only the correct signal can be easily identified without mixing with the correct pulse signal. Therefore, accurate measurement can be performed even if a low-power transmission / reception unit is adopted.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a front explanatory view of a bicycle to which the transmitting / receiving device of the present invention is attached, FIG. 2 is an enlarged view of a main part of the transmitting device portion of FIG. 1, and FIG. 3 is an embodiment of the transmitting / receiving device of the present invention. FIG. 4 is a block diagram showing the configuration of the transmitting device, FIG. 4 is a flowchart showing an example of the operation of the signal generating means of FIG. 3, and FIG. 5 shows the input signal from the reed switch and the pulse signal of the signal generating means in the transmitting device of FIG. FIG. 6 is a block diagram showing the configuration of a receiving device of an embodiment of the transmitting / receiving device of the present invention.
FIG. 7 is an explanatory plan view showing the outer appearance of a receiving apparatus of an embodiment of the transmitting / receiving apparatus of the present invention, FIG. 8 is a flowchart showing an example of control means of the receiving apparatus of FIG. 6, and FIG. 9 is an example of the transmitting / receiving apparatus of the present invention. In the figure which shows the signal waveform of each section of the transmitting and receiving device of execution example,
(a) is an input waveform, (b) is a pulse waveform generated by a signal generating circuit, (c) is a transmission waveform, (d) is a diagram showing a demodulation waveform obtained by a receiver, and FIG. 10 is a transmission / reception of the present invention. 7 is a flowchart showing an operation of a transmission / reception device of an embodiment of the device.

As shown in FIGS. 1 and 2, magnets 5 are attached to the spokes 3 of the front wheels 2 of the bicycle 1, and the transmitter 8 is attached to the front fork portion 7 of the bicycle 1. Moreover, the transmitter 8 is arranged so as to be positioned on the rotation locus of the magnet 5 as the front wheel 2 rotates.

On the other hand, the receiving device 14 is detachably attached to the handlebar 15 of the bicycle 1 via a bracket or the like.

Further, as shown in FIGS. 2 and 3, the transmitter 8 has a reed switch 9 which is opened and closed by the magnetic force of the magnet 5.
And a signal generating means 10 for generating a pulse signal in which at least two different pulse widths sequentially appear with respect to the signal generated by opening / closing the reed switch 9, and an output antenna 12 for outputting the pulse signal generated by the signal generating means 10. It is composed of a transmission circuit 11 for transmitting data from the reed switch 9, a reed switch 9, a signal generating means 10 and a battery 13 for supplying power to the transmission circuit 11.

The reed switch 9 is composed of, for example, a contact enclosed in glass, and the magnet 5 is connected to the reed switch 9.
The contact is turned on to generate a pulse-like signal when approaching, and it serves as signal input means for inputting a signal due to rotation of a wheel or the like.

Further, the signal generating means 10 generates pulse waves corresponding to the individual signals continuously appearing from the reed switch 9, and the pulse waves are repeated in a predetermined order with different pulse widths. The pulse signal is composed of a set of pulse waveforms. The signal generating means 10 is, for example, a microcomputer (hereinafter referred to as a microcomputer).
And generate signals according to the procedure shown in the flow chart of FIG. That is, when a signal is input to the signal generating means 10 from the reed switch 9 (step S101), the input signal is sequentially counted as 1, 2, 3, ... (Step S102). Next, it is determined whether the count number of the input signal is odd or even (step S103).
As the pulse waveform (b) generated corresponding to each input signal (a) is shown in Fig. 5, a pulse wave with a pulse width of A is output when the count number of the input signal is odd, and when the count number of the input signal is even A pulse wave having a pulse width of B is output. As a result, an alternating output waveform of pulse waves having different pulse widths synchronized with the input signal from the reed switch 9 is obtained (step S104,
S105).

The transmission circuit 11 is composed of a carrier wave generator, an antenna coil driver, and the like, similar to the one used as a conventional wireless transmitter, and modulates and amplifies the carrier wave by the signal.

As shown in FIG. 7, the receiving device 14 has a mode changeover switch 23 and a start / stop switch 24 under the liquid crystal display 19. The mode selector switch 23 is a clock display mode for displaying the time on the numerical display portion 19a in the lower stage of the liquid crystal display 19,
Maximum speed display mode to display maximum speed, total distance display mode to display total distance, travel distance display mode to display traveling distance, average speed display mode to display average speed, elapsed time display mode to display elapsed time It is a switch for selecting such as. In addition, the start / stop switch 24 is for starting the measurement of mileage or elapsed time,
This is a switch for giving instructions such as termination.

As shown in the block diagram of FIG. 6, the receiving device 14 has a receiving antenna 16 for receiving a pulse signal transmitted from the transmitting device 8 and a control means for receiving the receiving signal of the receiving antenna 16 which will be described later. The receiving circuit 17 that outputs to 18,
Control means 18 for calculating the traveling speed and the like of the bicycle 1 based on the output signal of the receiving circuit 17, a liquid crystal display 19 for displaying the traveling speed and the like, and operation from the display mode changeover switch 23 and the start / stop switch 24 described above. A switch circuit 21 for inputting a signal to the control means 18, a crystal oscillation circuit 22 for giving an operation cycle clock signal to the control means 18, a receiving circuit 17,
It comprises a control means 18 and a battery 20 for supplying power to the liquid crystal display 19.

The receiving circuit 17 is composed of receiving means similar to those used in a usual radio receiving apparatus, and is composed of, for example, an amplifying circuit, a detecting circuit and a demodulating circuit.

The control means 18 is means for converting the received signal detected and detected into desired data such as speed and traveling distance. The control means 18 is composed of, for example, a microcomputer, and performs calculations such as traveling speed and controls the liquid crystal display 19. The control means 18 performs control operation according to the procedure shown in the flowchart of FIG.

When a signal is input from the demodulation circuit in the receiving circuit 17 (step S201), the microcomputer considers it as an input pulse width. When the pulse width of the first input signal is the pulse width of A (step S202), the microcomputer determines the input pulse as a transmission signal, counts it, and then waits for the input of the pulse of B pulse width. (Step S203). Even if a pulse with a pulse width other than B is input, it is not judged as a transmission signal, and the input of a pulse with a pulse width B is waited for (step S204). When a pulse with a pulse width of B is input, the microcomputer determines that it is a transmission signal, calculates the running speed, etc. from the interval (time) with the previously input signal, displays it on the liquid crystal display 19, and then displays the pulse width. Waits for A pulse input (step S205). Even if a pulse with a pulse width other than A is input, it is not judged as a transmission signal, and the input of a pulse with a pulse width of A is waited for (step S20
6). When a pulse with a pulse width of A is input, the microcomputer determines that it is a transmission signal, calculates the traveling speed and the like from the interval (time) between the pulse input immediately before and the pulse input this time, and the liquid crystal display 19 , And then waits for the input of a pulse having a pulse width of B (step S207). After that, the step
Repeat S204 to S207.

When the first pulse width is B in step S202, the microcomputer determines that the signal is a transmission signal, and when the pulse width is other than that, the microcomputer does not count (step S208). When the first pulse width is B, the microcomputer judges that it is a transmission signal,
Next, it waits for the input of the pulse whose pulse width is A (step S2
09). Even if a pulse with a pulse width other than A is input, the microcomputer does not determine that it is a transmission signal, and waits for a pulse with a pulse width A (step S210). When a pulse with a pulse width of A is input, the microcomputer determines that it is a transmission signal, calculates the running speed, etc. from the interval (time) from the previously input signal, displays it on the liquid crystal display 19, and then displays the pulse. The input of a pulse having a width of B is waited for (step S211). Even if a pulse with a pulse width other than B is input, the microcomputer does not determine that it is a transmission signal and waits for a pulse with a pulse width B (step S212). When a pulse with a pulse width of B is input, the microcomputer determines that it is a transmission signal, calculates the traveling speed and the like from the interval (time) between the pulse input immediately before and the pulse input this time, and the liquid crystal display 19 , And then waits for the input of a pulse having a pulse width of A (step S213). Thereafter, steps S210 to S213 are repeated.

In this way, by reading only the pulse signals composed of pulse waves having different pulse widths in the above-mentioned transmitting device, only the necessary signals are taken out and the desired signals are converted, excluding the pulses interfering as noise. You can

In steps S205 and S211, the control means 18 calculates the traveling speed, the traveling distance, etc. from the input signal from the receiving circuit 17 and the preset wheel circumference, and based on the operation signal from the switch circuit 21. The liquid crystal display 19 displays the traveling speed and the traveling distance.
The display of the traveling speed is displayed on the traveling speed display portion 19b at the upper stage of the liquid crystal display 19, for example, in kilometers per hour (km / h) or miles per hour (Mile / h). Further, the control means 18 executes the control operation step by step based on the operation cycle clock signal given from the crystal oscillation circuit 22 and counts the time.

Next, the operation will be described with reference to the pulse waveform of FIG. 9 and the flowchart of FIG. 10 (see FIGS. 1 to 7 for the reference numerals of each part).

First, the transmitter side will be described. While traveling, as the front wheel 2 of the bicycle 1 rotates, the magnet 5 mounted on the front wheel 2 also rotates and passes in front of the transmitting device 8 mounted on the front fork portion 7 of the bicycle 1 (step S).
1). When the magnet 5 passes in front of the transmitter 8, the contact of the reed switch 9 inside the transmitter 8 opens and closes (step S2). By opening / closing the reed switch 9, the pulse signal shown in FIG. 9 (a) is generated (step S).
3). This pulse signal is input to the signal generating means 10 (step S4), and as shown in FIG. 9 (b), it is converted into a pulse signal in which pulses having different predetermined two pulse widths, for example, sequentially appear (step S4). S5). This pulse signal is input to the transmission circuit 11 (step S6), a carrier wave of about 5 kHz is modulated (see FIG. 9 (c)), amplified (step 7), and then transmitted from the transmission antenna 12 to the reception device 14. (Step S8). The reason for transmitting by modulating the carrier wave with this pulse signal is as shown in FIG.
This is because if the pulse signal in (b) is used as it is, the electric power is weak due to the DC electric field and almost no transmission is possible.

Next, the operation on the receiving device side will be described. First, the mode changeover switch 23 and the start / stop switch 24 are operated in advance to store the circumference of the front wheel 2 in the control means 18. The radio waves transmitted from the transmitter 8 during running are received by the reception antenna 16 incorporated in the receiver 14 attached to the handlebar 15 of the bicycle 1 and input to the reception circuit 17 (step S10). This reception signal is amplified by the reception circuit 17, detected and demodulated (step S11), and the control circuit 18 counts only pulse waveforms which are alternately input with pulse waveforms having two different predetermined pulse widths. By doing so, the traveling speed of the bicycle is calculated (step S12). Based on the result of this calculation, the current running speed will be displayed on the LCD
It is displayed on 19 (step S13).

Although the transmitting / receiving apparatus of the present invention is applied to the bicycle speedometer in the above embodiment, the application of the idea of the present invention is not limited to this. For example, the idea of the present invention can be applied to any device that wirelessly transmits and receives information, such as a wireless pulse meter as well as a measuring device in a transportation means other than a bicycle.

Further, in the above-mentioned embodiment, the signal generating circuit 10 converts the pulse signals having two different pulse widths alternately, but the different pulse widths are not limited to two kinds, and three or more kinds may be used. If they are generated in a predetermined order, they can be prevented from being mixed with noise, and can be similarly applied.

[0029]

According to the present invention, since a plurality of pulses having different pulse widths are transmitted and received by using a pulse signal arranged in a specific pattern as one unit, it is less susceptible to disturbance even at low output, that is, a miss error occurs. A highly reliable transmitter / receiver with no count can be obtained.

Further, since the same number of pulse signals as the pulse signals generated by opening / closing the reed switch are transmitted, the current consumption of the transmitter can be reduced.

Further, counting only the pulse signals in a predetermined order with a predetermined width can easily correspond to the control circuit in terms of software of the microcomputer, so that the structure of the receiving circuit becomes simple.

[Brief description of drawings]

FIG. 1 is a front explanatory view of a bicycle to which a transmitting / receiving device of the present invention is attached.

FIG. 2 is an enlarged view of a main part of a transmission device unit shown in FIG.

FIG. 3 is a block diagram showing a configuration of a transmission device of an embodiment of the transmission / reception device of the present invention.

4 is a flow chart showing an example of the operation of the signal generating means of FIG.

5 is a diagram showing a relationship between an input signal from a reed switch and a pulse signal of a signal generating means in the transmitter of FIG.

FIG. 6 is a block diagram showing a configuration of a receiving device of an embodiment of a transmitting / receiving device of the present invention.

FIG. 7 is an explanatory plan view showing the outer appearance of the receiving device of the embodiment of the transmitting / receiving device of the present invention.

8 is a flowchart showing an example of control means of the receiving apparatus of FIG.

9A and 9B are diagrams showing signal waveforms of respective parts of an embodiment of the transmitting / receiving apparatus of the present invention, where FIG. 9A is an input waveform, FIG. 9B is a pulse waveform generated by a signal generating means, and FIG. 9C is a transmission waveform. , (D) are demodulated waveforms obtained by the receiver.

FIG. 10 is a flowchart showing the operation of an embodiment of the transmitting / receiving apparatus of the present invention.

[Explanation of symbols]

 8 transmitter 9 reed switch 10 signal generation circuit 11 transmitter circuit 14 receiver 17 receiver circuit 18 control circuit 19 liquid crystal display

Claims (1)

[Claims] 1. A signal input means for continuously inputting signals, a pulse wave corresponding to each signal input by the signal input means, and a predetermined pulse width having a different pulse width. Signal generating means for generating a pulse signal that repeats the sequence of steps, a wireless transmitting means for continuously wirelessly transmitting the pulse signal, a receiving means for sequentially receiving the wirelessly transmitted pulse signals, and the received signal. A transmitter / receiver comprising a control means for converting a pulse signal into data that can be perceived by humans.