JP3452438B2 - Data transmission / reception system and data transmission / reception method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transmission / reception system and a data transmission / reception method used for various communication devices to transmit / receive data.

[0002]

2. Description of the Related Art Conventionally, digital data has been transmitted by A
This is performed using a signal according to a modulation method such as SK, FSK, PSK or the like. Among them, the PSK modulation method is a modulation method in which a signal is used as a data change point as a change in the phase of a carrier wave, and high-speed transmission is possible and noise resistance is higher than that of other ASK or FSK modulation methods. It is an excellent method. However, even in such a PSK modulation method, the transmission rate is limited by the frequency, and for example, 25 kb in the medium wave band.
It is about ps.

A conventional data transmission / reception method using the PSK modulation method will be described below with reference to the drawings. Figure 5
FIG. 4 is a partial block diagram of a conventional data transmission / reception system. As shown in FIG. 5, a coil 61 and a capacitor 62 are connected in series to form a series resonance circuit 63, and a coil 64 and a capacitor 65 are connected in parallel to form a first parallel resonance circuit 66.
And a coil 67 and a capacitor 68 are connected in parallel to form a second parallel resonant circuit 69. 70 is an input terminal of the series resonance circuit 63, 71 is the first parallel resonance circuit 66.
Is an output terminal, and 72 is an input / output terminal of the second parallel resonant circuit 69.

Generally, the series resonance circuit 63 and the first parallel resonance circuit 66 are installed in the interrogator, and the second parallel resonance circuit 6 is provided.
9 is installed in the transponder. Circuit parts other than the input / output circuit are omitted.

The operation of the conventional data transmission / reception system configured as described above will be described below. The signal PSK-modulated on the interrogator side (hereinafter referred to as PSK signal) is amplified, input from the input terminal 70 to the series resonance circuit 63, and transmitted as a radio wave. This radio wave is the second wave on the responder side
Is received by the parallel resonance circuit 69, is input to the signal processing circuit from the input / output terminal 72, is demodulated by the PSK demodulator (not shown), and necessary data is extracted.

On the other hand, from the responder side, the data to be transmitted is converted into a PSK signal through a PSK modulator (not shown) and is transmitted as a radio wave from the second parallel resonance circuit 69. This radio wave is received by the first parallel resonant circuit 66 on the interrogator side, input from the output terminal 71 to the signal processing circuit, and P
The data is demodulated by an SK demodulator (not shown) and necessary data is taken out. In the above-mentioned conventional example, the case of using the PSK modulation method has been described, but data transmission / reception is similarly performed in the ASK modulation method.

[0007]

However, in the conventional data transmission / reception system as described above, the PSK modulation method is the best in terms of the transmission speed, but it is still 2
The maximum speed is about 5 kbps, and in order to further increase the transmission speed, it is necessary to increase the carrier frequency. In that case, the circuit configuration increases and power consumption increases. When the power supply is limited, it is difficult to increase the carrier frequency.

As a method of increasing the transmission rate without increasing the carrier frequency, 4-level PSK and 16-level PS
Although there are methods such as K, there is a problem that the circuit becomes very complicated.

The present invention solves the above-mentioned conventional problems, and a data transmission / reception system and a data transmission / reception system capable of improving the actual transmission speed without increasing the carrier frequency and without using a complicated circuit. Provide a sending and receiving method.

[0010]

In order to solve the above-mentioned problems, in a data transmission / reception system according to claim 1 of the present invention, at least a first coil and a first capacitor are connected in series so as to resonate in series. A series resonance circuit, a first parallel resonance circuit connected in parallel so that at least a second coil and a second capacitor resonate in parallel, and at least a third coil and a third capacitor resonate in parallel. A second parallel resonant circuit connected in parallel,
A second coil, a second coil, and a third coil are arranged so that the coils are electromagnetically coupled to each other, and the second parallel resonant circuit is sent out from the series resonant circuit.
And sending a second signal to the first parallel resonant circuit, and the resonant frequency of the first parallel resonant circuit is controlled by the ASK signal to be shifted.
Flow into the series resonant circuit and the second parallel resonant circuit
A first detuning circuit configured to change the current flowing through the second parallel resonant circuit
The first parallel resonant circuit controlled by an ASK signal to be shifted
It is characterized in that a second detuning circuit configured to change the current flowing through is connected.

A data transmitting / receiving method according to a fifth aspect of the present invention comprises an interrogator having a series resonant circuit, a first parallel resonant circuit, and a transponder having a second parallel resonant circuit. In a data transmission / reception system in which the coils forming the above are electromagnetically coupled, at the time of data transmission from the interrogator to the responder, a PSK signal is input to the series resonant circuit and connected to the first parallel resonant circuit. It is then shifted its resonant frequency, the series resonant circuit and
The ASK signal is input to the first detuning circuit configured to change the current flowing in the second parallel resonant circuit ,
The ASK signal is superimposed on the PSK signal, the superimposed signal is sent out from the series resonant circuit as a first signal, and the first signal is received by the second parallel resonant circuit, and then the PSK signal and the ASK signal are combined. It separated, when sending data to the interrogator from the responder inputs the PSK signal to the second parallel resonant circuit, connected to the second parallel resonance circuit and shifted the resonant frequency, the first Flowing in the parallel resonant circuit of
A second detuning circuit configured to change the current
The SK signal is input, the ASK signal is superimposed on the PSK signal, the superimposed signal is sent out as a second signal from the second parallel resonant circuit, and the second signal is transmitted by the first parallel resonant circuit. It is characterized in that after receiving, it is separated into a PSK signal and an ASK signal.

According to the above configuration and method, basically, while adopting the PSK modulation method, the detuning circuit is controlled by the ASK signal to detune the parallel resonant circuit, thereby transmitting data by the PSK signal. By changing the current of the resonance circuit inside and using the changed amount as the ASK signal, data transmission is performed with the ASK signal superimposed on the PSK signal.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A data transmission / reception system and a data transmission / reception method showing an embodiment of the present invention will be described below with reference to the drawings.

First, the data transmission / reception system will be described. FIG. 1 is a partial block diagram of a data transmitting / receiving system according to the present embodiment. As shown in FIG. 1, a coil 1 and a capacitor 2 are connected in series to form a series resonance circuit 9, a coil 3 and a capacitor 4 are connected in parallel to form a first parallel resonance circuit 10, and a coil 6 and Capacitor 7
And constitute a second parallel resonance circuit 11. Reference numeral 5 is a first detuning circuit for detuning the first parallel resonant circuit 10, and 8
Is a second detuning circuit for detuning the second parallel resonant circuit 11. Generally, the series resonant circuit 9 and the first parallel resonant circuit 10 are installed in the interrogator, and the second parallel resonant circuit 11 is installed in the responder. The coil 1, the coil 6, and the coil 3 are electromagnetically coupled to each other, and the current flowing in the series resonance circuit 9 can be changed by operating the first detuning circuit 5, and this change is caused in the responder. It appears in the installed second parallel resonant circuit 11. That is, it is possible to superimpose the signal for operating the first detuning circuit 5 on the signal originally sent from the series resonance circuit 9.

By operating the second detuning circuit 8 installed in the transponder, the current flowing in the series resonance circuit 9 installed in the interrogator can be changed, and this change 1 appears in the parallel resonant circuit 10. That is, the signal that originally operates the second detuning circuit 8 can be superimposed on the signal that is originally sent from the second parallel resonant circuit 11. Therefore, the data transmission / reception system can multiplex and transmit different signals.

Next, a data transmission / reception method using the data transmission / reception system configured as described above will be described. 2 is a block diagram of a data transmission / reception system for explaining a data transmission / reception method in the present embodiment, FIG. 3 is a waveform diagram for explaining an example of data transmission from an interrogator to a responder, and FIG. It is a waveform diagram for explaining an example of data transmission from the responder to the interrogator. Note that the time axis in FIG. 4 is displayed twice as compressed as in FIG.

In FIG. 2, 21 is an interrogator and 22 is a responder. Generally, a frequency of about 400 KHz is used when data is transmitted from the interrogator 21 to the responder 22, and in the opposite case, a frequency of about 200 KHz is used. To be

23a to 23d are transmission Ps in order.
Input terminal for SK signal, input terminal for transmission ASK signal,
An output terminal for the received PSK signal and an output terminal for the received ASK signal. Reference numeral 24 is an amplifier for amplifying the transmission PSK signal input from the input terminal 23a, 26 is a series resonance circuit composed of a coil 25a, a capacitor 25b and a resistor 25c, 28 is a first circuit composed of a coil 27a, a capacitor 27b and a resistor 27c. 1 parallel resonance circuit.

The first detuning circuit R1 is a transistor 29a.
And a resistor 29b, and the transistor 29a is turned on / off by a transmission ASK signal input from the input terminal 23b.
When is turned on, the resistor 29b is inserted in parallel with the resistor 27c.

The first parallel resonance circuit 28 is a circuit for receiving the data transmitted from the responder 22, and the received PSK signal selected by the filter 30 is the amplifier 31 and PSK.
The ASK signal output from the output terminal 23c via the signal demodulation circuit 32 is supplied to the diode bridge 33 and the ASK signal.
The signal is output from the output terminal 23d via the signal demodulation circuit 34.

As described above, the interrogator 21 is constituted by the series resonance circuit 26, the first parallel resonance circuit 28 and their associated circuits. Next, the main part of the circuit that constitutes the transponder 22 will be described. 35a to 35f are an output terminal for a received ASK signal, an output terminal for a received PSK signal, a power supply terminal, a ground terminal, an input terminal for a transmitted ASK signal, and an input terminal for a transmitted PSK signal, respectively.
37 is a coil 36a, a capacitor 36b and a resistor 36.
It is a second parallel resonant circuit configured by c.

The second detuning circuit R2 includes a transistor 38
a and a resistor 38b, the transistor 38a is turned on / off by a transmission ASK signal input from the input terminal 35e.
When a is turned on, the resistor 38b is inserted in parallel with the resistor 36c. This second parallel resonant circuit 37
Operates as a receiving circuit when transmitting data from the interrogator 21 to the responder 22, and operates as a transmitting circuit when transmitting data in reverse.

A diode bridge 39 rectifies the current flowing through the second parallel resonance circuit 37, smoothes it through the smoothing circuit H, and supplies power to each circuit from the power supply terminal 35c. Further, the output from the second parallel resonant circuit 37 is processed by the rectifying circuit 40 and the ASK signal demodulating circuit 41, the received ASK signal is output from the output terminal 35a, and similarly, the rectifying circuit 42 and the PSK signal demodulating circuit 43. The processed PSK signal is output from the output terminal 35b.

An amplifier 44 amplifies the transmission PSK signal input from the input terminal 35f to a level required for the second parallel resonance circuit 37. Further, M1 indicates the electromagnetic coupling between the coil 25a and the coil 36a, and M2 indicates the coil 2
5a shows the electromagnetic coupling between the coil 27a, and M3 shows the electromagnetic coupling between the coil 27a and the coil 36a, respectively.

A data transmission / reception method in the data transmission / reception system configured as described above will be described below. First, referring to FIG. 3 together with FIG. 2, the interrogator 2
A method of transmitting data from 1 to the responder 22 will be described.

The transmission PSK signal shown in FIG.
Input from a. The transmitted PSK signal contains transition points 50 and 51 where the phase is shifted by 180 °. The transmission PSK signal is amplified by the amplifier 24 and input to the series resonance circuit 26. At the same time, the transmitted ASK signal is input to the input terminal 23.
It is input from b and is input to the transistor 29a. The transmitted ASK signal has change points 52 and 53, at which the transistor 29a turns on and the resistance 2
9b is inserted in parallel with the resistor 27c. At this time, the circuit constant of the first parallel resonant circuit 28 changes, and the resonance point shifts. Therefore, like the series resonance waveform of FIG. 3, when the transmission ASK signal is low, a current waveform corresponding to the transmission PSK signal flows through the series resonance circuit 26, but when the resonance point of the first parallel resonance circuit 28 shifts. ,
The waveform of the current flowing through the series resonance circuit 26 changes.

This current waveform is detected by the coil 36a of the second parallel resonance circuit 37 on the responder 22 side. Coil 36
A part of the current flowing in a is rectified by the diode bridge 39, and is supplied as a power supply from the power supply terminal 35c to each circuit through the smoothing circuit H including a resistor, a Zener diode, a capacitor and the like.

A part of the current flowing through the coil 36a is full-wave rectified by the rectifying circuit 40 and then input to the ASK signal demodulating circuit 41, where it is detected to generate the ASK detection signal shown in FIG. The received ASK signal is output from the output terminal 35a.

Similarly, the received PSK signal also has a coil 36.
After a part of the current flowing through a is full-wave rectified by the rectifier circuit 42, the PSK signal demodulator circuit 43 generates a binarized signal and a clock, and finally the output terminal 35b receives the PSK signal.
The signal is output.

Next, referring to FIG. 4 together with FIG.
A method of transmitting data from the responder 22 to the interrogator 21 will be described. In this case as well, in the interrogator 21, the transmission PSK signal is input from the input terminal 23a and is not modulated, but PS
K signal is being sent.

First, the transmission PSK signal input from the input terminal 35f is amplified by the amplifier 44 to a level sufficient to drive the second parallel resonant circuit 37. This current waveform has a change point 55, like the transmission PSK signal shown in FIG.
Has 56. At the same time, the transmitted ASK signal is input terminal 3
5e is input to the transistor 38a. Send ASK
As shown in FIG. 4, the signal has changing points 57 and 58, at which the transistor 38a is turned on and the resistor 38b is inserted in parallel with the resistor 36c. At this time, the circuit constant forming the second parallel resonance circuit 37 changes, and the resonance point shifts.

Therefore, like the series resonance waveform of FIG. 4, when the transmission ASK signal is low, a current waveform corresponding to the unmodulated PSK signal flows through the series resonance circuit 26.
If the resonance point of the parallel resonant circuit 37 is deviated, the current flowing through the series resonant circuit 26 changes. This current waveform is interrogator 2
The waveform is detected by the first parallel resonance circuit 28 on the first side, and its waveform becomes substantially similar to the series resonance waveform of FIG. The signal detected by the first parallel resonance circuit 28 is selected by the filter 30, amplified by the amplifier 31, and then the PSK signal demodulation circuit 3
It is demodulated by 2 and output as a received PSK signal from the output terminal 23c. The method for obtaining this PSK signal is the same as the operation in the transponder 22, and is omitted in FIG.

The diode bridge 33 receives the current from the first parallel resonance circuit 28 and full-wave rectifies it. Then, the signal is demodulated by the ASK signal demodulation circuit 34, and the received ASK signal is received.
A signal is output from the output terminal 23d.

The data transmission / reception method of the data transmission / reception system according to the present embodiment superimposes the ASK signal on the PSK signal to transmit the data, so that the actual frequency can be increased without increasing the carrier frequency and without using a complicated circuit. A data transmission / reception method that can improve the transmission speed can be realized.

[0035]

As described above, according to the present invention, while basically adopting the PSK modulation method, the detuning circuit is ASK
By controlling with a signal and detuning the parallel resonant circuit,
By changing the current of the resonance circuit during data transmission by the PSK signal and using the changed amount as the ASK signal, data can be transmitted in the state where the ASK signal is superimposed on the PSK signal.

Further, each detuning circuit provided in each parallel resonant circuit of the first parallel resonant circuit installed in the interrogator and the second parallel resonant circuit installed in the responder causes resonance of each parallel resonant circuit. The points can be shifted, the PSK signal is input to the series resonator in the interrogator, the detuning circuit is controlled by the ASK signal, the ASK signal is superimposed on the PSK signal, and the result is transmitted to the responder. It is possible to input the PSK signal to the parallel resonance circuit of No. 2 and control the detuning circuit with the ASK signal so that the ASK signal is superimposed on the PSK signal and transmitted to the interrogator.

Therefore, the actual transmission speed can be easily improved without increasing the carrier frequency and without using a complicated circuit.

[Brief description of drawings]

FIG. 1 is a partial block diagram of a data transmission / reception system according to an embodiment of the present invention.

FIG. 2 is a block diagram explaining a data transmission / reception method in the same embodiment.

FIG. 3 is a waveform diagram illustrating an example of data transmission in the same embodiment.

FIG. 4 is a waveform diagram explaining another example of data transmission in the same embodiment.

FIG. 5 is a partial block diagram of a conventional data transmission / reception system.

[Explanation of symbols]

5 First detuning circuit 8 Second detuning circuit 9 Series resonance circuit 10 First parallel resonant circuit 11 Second parallel resonant circuit

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masayuki Arai 2-16-46 Minami Kamata, Ota-ku, Tokyo Within Tokimec Co., Ltd. (72) Inventor Akihisa Yamazaki 2-16-46 Minami Kamata, Ota-ku, Tokyo Incorporated by Tokimec Co., Ltd. (56) Reference JP-A-60-25354 (JP, A) JP-A-1-151831 (JP, A) JP-A-4-140685 (JP, A) JP-A-6-281733 ( JP, A) JP-A-5-276099 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H04B 5/00-5/02 H04B 1/59 H04L 27/00-27 / 30

Claims (5)

(57) [Claims] 1. A series resonance circuit in which at least a first coil and a first capacitor are connected in series so as to resonate in series, and at least a second coil and a second capacitor are connected in parallel so as to resonate in parallel. A first parallel resonance circuit; and a second parallel resonance circuit in which at least a third coil and a third capacitor are connected in parallel so as to resonate in parallel, and the first coil, the second coil, and A third coil is arranged so that the coils are electromagnetically coupled to each other, and the second parallel resonance circuit receives the first signal sent from the series resonance circuit and is connected to the first parallel resonance circuit. A second signal is sent to the resonance circuit, and the resonance frequency of the first parallel resonance circuit is transmitted to the ASK signal.
And the second series resonance circuit and the second resonance circuit.
And connecting the first detuned circuit that is configured to vary the current flowing through the parallel resonant circuit, the second parallel resonance circuit, the resonance frequency ASK signal
Controlled by the control signal and shift to flow into the first parallel resonant circuit.
A data transmission / reception system in which a second detuning circuit configured to change a current is connected. 2. An interrogator for transmitting data for a question, and
And a responder that receives the transmitted data, transmits data for a response according to the transmitted data, and responds,
The data transmission / reception system according to claim 1, wherein the series resonance circuit and the first parallel resonance circuit are arranged in an interrogator, and the second parallel resonance circuit is arranged in a responder. 3. A first detuning circuit and a second detuning circuit,
The data transmission / reception system according to claim 1, wherein a field effect transistor and a resistor connected in series are inserted in parallel to the coils of each parallel resonant circuit to which each detuning circuit is connected. 4. The first detuning circuit and the second detuning circuit,
The data transmission / reception system according to claim 1, 2 or 3, wherein each is driven by an ASK signal, and the first signal and the second signal are superposed signals of a PSK signal and the ASK signal. 5. An interrogator having a series resonance circuit, a first parallel resonance circuit, and a transponder having a second parallel resonance circuit, and coils constituting the respective resonance circuits are electromagnetically coupled. in data transmission and reception system, when sending data to the responder from the interrogator inputs the PSK signal in the series resonant circuit is connected to the first parallel resonance circuit and shifted the resonant frequency, the series co
The current flowing through the vibration circuit and the second parallel resonance circuit.
The ASK signal is input to the first detuning circuit configured to convert the signal, the ASK signal is superimposed on the PSK signal, and the superimposed signal is transmitted from the series resonant circuit as the first signal. Signal is received by the second parallel resonant circuit, the PSK signal and the ASK signal are separated, and when transmitting data from the transponder to the interrogator, the PSK signal is input to the second parallel resonant circuit. , is connected to the second parallel resonance circuit and shifted the resonant frequency, the
The ASK signal is input to the second detuning circuit configured to change the current flowing through the first parallel resonant circuit, and PS
The ASK signal is superimposed on the K signal, and the superimposed signal is added to the second signal.
From the parallel resonance circuit of the
A data transmission / reception method in which the signal is received by the first parallel resonant circuit and then separated into a PSK signal and an ASK signal.