JP2006148674A - Transceiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transceiver which can reduce power consumption in data transmission by controlling power-on and power-off related to reactance adjustment. <P>SOLUTION: The transceiver comprises: a power source for supplying power; a transmission means that modulates information with a carrier for transmission; a variable reactance means which changes a reactance value so that a transmission voltage becomes maximum, for controlling the state of resonating stray capacitance between a ground of a signal-generator and the earth ground and stray capacitance between a field transmission medium and the earth ground; an amplitude monitor means for detecting an amplitude of an electric field in the resonant state and providing the amplitude as control information; a reception means for receiving the electric field; and a power source switch which powers on the variable reactance means, the transmission means, the amplitude monitor means and the control signal generating means and powers off the reception means during a resonant state control period. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a transceiver that induces an electric field in an electric field transmission medium and transmits information using the induced electric field.

  Due to the miniaturization and high performance of portable terminals, wearable computers that can be attached to living bodies have been attracting attention. Conventionally, as information communication between such wearable computers, a transceiver is connected to a computer to form an integral structure, and an electric field induced by the transceiver is transmitted to the inside of a living body that is an electric field transmission medium, thereby transmitting and receiving information. The method of performing is proposed (for example, refer patent document 1).

In such a transceiver for electric field communication floating from the ground, in order to efficiently induce an electric field in the human body, a variable reactance is inserted between the transmission / reception electrode and the transmission circuit, and between the human body or the circuit ground and the ground ground. Resonance with stray capacitance is used. In order to bring the variable reactance into a resonance state, the reactance value is adjusted using an amplitude monitor unit, a control signal generation unit, an electric field detection optical unit, and a signal processing unit.
JP 2004-153708 A

  In the transceiver according to the above-described prior art, even when data after reactance adjustment is completed is transmitted, the power consumption related to reactance adjustment is turned on, so the power consumption during data transmission has increased. .

  The present invention has been made in view of the above-described problems, and an object of the present invention is to control power on / off related to reactance adjustment, and to reduce power consumption during data transmission. It is to provide a possible transceiver.

  In order to solve the problem, the present invention according to claim 1 induces an electric field based on information to be transmitted in an electric field transmission medium, and transmits the information using the induced electric field, while the electric field transmission is performed. A transceiver for receiving information by receiving an electric field based on information to be received induced in a medium, and a power source for supplying power required for the transmission and the reception, and the information generated by a transmitter Transmitting means for modulating and transmitting with a carrier wave, stray capacitance between the ground of the transmitter and the ground ground by changing a reactance value so that the voltage of the transmission applied to the electric field transmission medium is maximized, and Variable reactance means for controlling the resonance state of the stray capacitance between the electric field transmission medium and the ground, and the reactance value of the variable reactance means is controlled. Control signal generating means for generating a control signal for detecting, amplitude monitoring means for detecting the amplitude of the electric field in the resonance state and providing it as control information to the control signal generating means, and receiving for receiving the electric field Means for controlling the variable reactance means, the transmitting means, the amplitude monitoring means, and the control signal generating means in the control period of the resonance state due to the change of the reactance value in the transmission. A power switch for turning on the power and for turning off the power to the receiving means;

  According to a second aspect of the present invention, in the first aspect, the receiving unit is configured to irradiate and transmit a laser beam to an electro-optical element having a birefringence index corresponding to the received electric field potential. Electric field detection optics / signal processing means comprising: a laser light source that generates laser light; and a polarization detection means that detects polarization of the laser light transmitted through the electro-optic element as an electric signal; and the laser light of the laser light source A light amount control signal generating means for generating a light amount control signal for controlling the amount of light, a demodulation / waveform shaping means for demodulating the electric signal detected by the electric field detection optics / signal processing means and receiving the information And the light amount control signal generating means reduces or reduces the light amount of the laser light during the control period of the resonance state due to the change of the reactance value in the transmission. It performs the control of the eye.

  According to a third aspect of the present invention, in the power supply switch according to the first or second aspect, the power switch is turned on and off by a transmission / reception switching signal for instructing the operation switching between the transmission and the reception. Is controlled.

  According to a fourth aspect of the present invention, in the third aspect, the control period of the resonance state due to the change in the reactance value in the transmission includes the transmission / reception switching signal and the data that is the signal to be transmitted. It is generated by state determination means for outputting a logical product.

  According to the present invention, it is possible to provide a transceiver that can control on / off of a power source for reactance adjustment and can reduce power consumption during data transmission.

  FIG. 1 is a block diagram for explaining an overall configuration according to an embodiment of a transceiver of the present invention.

  In FIG. 1, a power source 1, an I / O circuit 2, a state determination circuit (state determination means) 3, a control signal generation unit 4, an amplitude monitor unit 5, a demodulation / waveform shaping unit (demodulation / waveform) Shaping means) 6, light quantity control signal (light quantity control signal generating means) 7, electric field detection optics / signal processing section (electric field detection optics / signal processing means) 8, transmission circuit (transmission means) 9, and first circuit A power switch (power switch) 10, a second power switch (power switch) 11, a third power switch (power switch) 12, a first switch 13, a second switch 14, and a variable A reactance unit (variable reactance means) 15, a transmission / reception electrode 17, and an insulator 18 are shown.

  Data (information) D is input to the transmission circuit 9, and the first power switch 10, the third power switch 12, the state determination circuit 3, and the light quantity control signal 7 include a transmission / reception switching signal S 1. Is entered. A control signal S 2 is output from the control signal generator 4 and input to the variable reactance unit 15. The living body 16 is not included in the configuration of the transceiver of the present invention, but is described for explaining the embodiment of the present invention.

  In addition, an electric field detection optics / signal processing unit 8, a demodulation / waveform shaping unit 6, and a light amount control signal 7 are included as receiving means. Of these, the electric field detection optical / signal processing unit 8 generates a laser beam (not shown) that emits a laser beam to transmit an electrooptic element (not shown) that exhibits a birefringence according to the electric field potential received. And a polarization detecting means (not shown) for detecting the polarization of the laser light transmitted through the electro-optical element as an electric signal.

  The light amount control signal 7 as the light amount control signal generating means generates a light amount control signal for controlling the light amount of the laser light from the laser light source. Further, the electric signal detected by the electric field detection optics / signal processing unit 8 is demodulated and information is received as information by the demodulation / waveform shaping unit 6.

  In such a configuration, the power supply 1 supplies power for the transceiver to transmit and receive data. The power sent from the power supply 1 is supplied to each component of the transceiver via the first power switch 10, the second power switch 11, and the third power switch 12.

  Among these, the first power switch 10 is connected to the transmission circuit 9, the variable reactance unit 15, and the control signal generation unit 4 to supply power. The second power switch 11 is connected to the amplitude monitor unit 5 to supply power, and the third power switch 12 is connected to the demodulation / waveform shaping unit 6 to supply power.

  A control signal from the I / O circuit 2 is input to each of the first power switch 10 and the third power switch 12, and the control signal is shown as a transmission / reception switching signal S1 in FIG. The output from the state determination circuit 3 is input to the second power switch 11.

  With this configuration, the first power switch 10 and the third power switch 12 are controlled by the transmission / reception switching signal S1 to control the opening / closing operation of the contacts (switching on / off of power supply). The control of the contact opening / closing operation (switching of power supply on / off) of the second power switch 11 is executed by the output from the state determination circuit 3.

  Next, the control and operation of the first power switch 10, the third power switch 12, and the second power switch 11 referred to in FIG. 1 will be described with reference to FIGS.

  First, FIG. 2 is a configuration diagram for explaining the operation of the state determination circuit 3 shown in FIG. The state determination circuit 3 includes a sampling circuit 20 and a logic circuit 21. In addition, a transmission / reception switching signal S1 and data D are input to the state determination circuit 3.

  The transmission / reception switching signal S1 input to the state determination circuit 3 is input to the sampling circuit 20 as a reset signal S4, and further input to the logic circuit 21 in order to perform a logical product with the output of the sampling circuit 20. The output from the logic circuit 21 is output to the outside as the output of the state determination circuit 3. Data D is input to the sampling circuit 20 as a sampling signal S3.

  Next, FIG. 3 is a timing chart for explaining signal processing in the state determination circuit 3 referred to in FIG. In FIG. 3, the transmission / reception switching signal S1, the data D, the sampling circuit output indicating the output of the sampling circuit 20, the sampling circuit output inversion obtained by inverting the output of the sampling circuit 20, the output of the logic circuit 21, These signals are shown as a timing chart on a common time axis.

  As shown in this timing chart, when the transmission / reception switching signal S1 is at the H level, the transceiver is in a transmission state. This transmission / reception switching signal S1 is sent from the I / O circuit 2 and becomes H level in the transmission state, and becomes L level in the reception state. Further, the control of the reactance value by the variable reactance unit 15 is executed in a period from when the transmission / reception switching signal S1 becomes H level to when the data D is input.

  Here, the data D is used as the sampling signal S3 in the sampling circuit 20 of the state determination circuit 3. As a result, the output of the sampling circuit becomes H level when data D is input. When this sampling circuit output is inverted and a logical product with the transmission / reception switching signal S1 is obtained, a signal that becomes H level only during the reactance control period can be generated and output from the logic circuit 21.

  By inputting this signal to the second power switch 11, the power supplied from the power source 1 to the amplitude monitor unit 5 is supplied (turned on) only during the reactance control period. Further, when the transmission state is entered, the signal input to the second power switch 11 becomes L level, and the supply of power supplied from the power source 1 to the amplitude monitor unit 5 is also stopped (off).

  For this reason, since the control signal S2 supplied from the control signal generator 4 to the variable reactance unit 15 is in a constant state, the reactance value set by the variable reactance unit 15 is fixed to a constant value.

  That is, since the power supply to the amplitude monitor unit 5 is performed only in the reactance control period, the power supply can be stopped in other periods where the reactance control is not required, thereby suppressing unnecessary power consumption.

  When the transceiver is in the transmission state, the transmission / reception switching signal S 1 is also input from the I / O circuit 2 to the first power switch 10. Since the transmission / reception switching signal S1 is at the H level only in the transmission state, the transmission circuit 9, the variable reactance unit 15, and the control signal generation unit 4 are connected to the power source 1 during this H level period, and the power supply is performed. Has been done.

  On the other hand, since the transmission / reception switching signal S1 input to the first power switch 10 is at the L level when the transceiver is in the reception state, the transmission circuit 9, the variable reactance unit 15, The control signal generator 4 is disconnected from the power source 1 and the power supply is stopped.

  Further, when the transceiver is in the receiving state, the transmission / reception switching signal S1 input to the third power switch 12 is at L level, and the power source 1 and the demodulation / waveform shaping unit 6 are connected to the third power source only during this L level period. The power switch 12 is connected to supply power.

  On the other hand, since the transmission / reception switching signal S1 is at the H level when the transceiver is in the transmission state, the third power switch 12 disconnects the connection between the power source 1 and the demodulation / waveform shaping unit 6 and stops the power supply.

  Next, FIG. 4 is a timing chart for explaining the operation of the light quantity control signal 7. As shown in FIG. 4, both the transmission / reception switching signal S <b> 1 and the output from the state determination circuit 3 are input to the light amount control signal 7.

  Here, the transmission / reception switching signal S1 is at the H level only when the transceiver is in the transmission state. Further, as referred to FIG. 3 already described, the output from the state determination circuit 3 becomes the H level only in the reactance control period.

  In response to these two types of signal inputs, the light amount of a laser (not shown) provided in the electric field detection optical / signal processing unit 8 is reduced stepwise when the transceiver moves from the reception state to the reactance control period. Further, in the transmission state, since it is not necessary to monitor the induced electric field, the amount of laser light is narrowed down and controlled to be zero or close to zero. In this way, at the time of transmission / reception and reactance control, the light quantity of the laser of the electric field detection optics / signal processing unit 8 is also switched by the light quantity control signal 7 to reduce power consumption.

  In the configuration of the embodiment of the present invention, an electric field based on information to be transmitted is induced in the electric field transmission medium, and information is transmitted using the induced electric field. A transceiver that receives information by receiving an electric field based on the information to be received induced by the power supply for supplying power required for transmission and reception, and modulating the information with a carrier wave generated by the transmitter The transmission means for transmitting and the reactance value is changed so that the transmission voltage applied to the electric field transmission medium is maximized, and the stray capacitance between the transmitter ground and the ground ground and between the electric field transmission medium and the ground ground. A variable reactance means for controlling a resonance state with the stray capacitance of the first and a control signal for generating a control signal for controlling a reactance value of the variable reactance means Generating means, amplitude monitoring means for detecting the amplitude of the electric field in the resonance state and providing it as control information to the control signal generating means, and receiving means for receiving the electric field, and for reactance value in transmission A power supply for turning on the power to the variable reactance means, the transmission means, the amplitude monitoring means, and the control signal generating means and turning off the power to the receiving means in the control period of the resonance state due to the change It has a switch.

  The receiving means includes a laser light source for generating laser light for irradiating and transmitting the laser light to the electro-optic element exhibiting a birefringence according to the received electric field potential, and a laser beam transmitted through the electro-optic element. Electric field detection optics / signal processing means having polarization detection means for detecting polarized light as an electrical signal, light quantity control signal generation means for generating a light quantity control signal for controlling the light quantity of laser light from the laser light source, and electric field detection A demodulation / waveform shaping means for demodulating an electrical signal detected by the optical / signal processing means to receive information, and a light amount control signal generating means in a control period of a resonance state due to a change in reactance value in transmission Controls to reduce or reduce the amount of laser light.

  The power switch is controlled to be turned on and off by a transmission / reception switching signal for instructing transmission and reception operation switching.

  Further, the control period of the resonance state due to the change of the reactance value in the transmission is generated by the state determination unit that outputs a logical product of the transmission / reception switching signal and the data that is the signal to be transmitted.

  According to the embodiment of the present invention described above, it is possible to provide a transceiver capable of controlling on / off of a power source related to reactance adjustment and capable of reducing power consumption during data transmission. .

The block diagram for demonstrating the whole structure based on embodiment of the transceiver of this invention is shown. The block diagram is shown for demonstrating operation | movement of the state determination circuit based on embodiment of the transceiver of this invention. 6 is a flowchart for explaining the operation of the state determination circuit according to the embodiment of the transceiver of the present invention. The flowchart for demonstrating operation | movement of the light quantity control signal based on embodiment of the transceiver of this invention is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Power supply 2 I / O circuit 3 State determination circuit 4 Control signal generation part 5 Amplitude monitor part 6 Demodulation and waveform shaping part 7 Light quantity control signal 8 Transmitting electrode 10 1st power switch 11 2nd power switch 12 3rd power supply Switch 13 1st changeover switch 14 2nd changeover switch 15 Variable reactance part 16 Living body 17 Transmission / reception electrode 18 Insulator 20 Sampling circuit 22 Logic circuit

Claims (4)

By inducing an electric field based on information to be transmitted in the electric field transmission medium and transmitting information using the induced electric field, while receiving an electric field based on the information to be received induced in the electric field transmission medium. A transceiver for receiving information,
A power supply for supplying power required for the transmission and the reception;
Transmitting means for modulating and transmitting the information with a carrier wave generated by a transmitter;
The reactance value is changed so that the transmission voltage applied to the electric field transmission medium is maximized, and the stray capacitance between the ground of the transmitter and the ground ground and the resonance of the stray capacitance between the electric field transmission medium and the ground ground Variable reactance means for controlling the state;
Control signal generating means for generating a control signal for controlling the reactance value of the variable reactance means;
Amplitude monitor means for detecting the amplitude of the electric field in the resonance state and providing the control signal generation means as control information;
Receiving means for receiving the electric field,
In the control period of the resonance state due to the change of the reactance value in the transmission, the power source is turned on for the variable reactance means, the transmission means, the amplitude monitor means, and the control signal generation means, and A transceiver comprising a power switch for turning off the power to the receiving means. The receiving means includes
A laser light source for generating the laser light for irradiating and transmitting a laser beam to an electro-optical element exhibiting a birefringence according to the received electric field potential, and polarization of the laser light transmitted through the electro-optical element. Electric field detection optics / signal processing means having polarization detection means for detecting as an electric signal,
A light amount control signal generating means for generating a light amount control signal for controlling the light amount of the laser light of the laser light source;
Demodulation and waveform shaping means for demodulating an electrical signal detected by the electric field detection optics / signal processing means and receiving the information;
2. The control according to claim 1, wherein the light amount control signal generation unit performs control for reducing or reducing the light amount of the laser light during a control period of the resonance state due to the change of the reactance value in the transmission. Transceiver. The power switch is
3. The transceiver according to claim 1, wherein on / off of the power supply is controlled by a transmission / reception switching signal for instructing an operation switching between the transmission and the reception. The control period of the resonance state due to the change of the reactance value in the transmission is:
4. The transceiver according to claim 3, wherein the transceiver is generated by a state determination unit that outputs a logical product of the transmission / reception switching signal and data that is the signal to be transmitted.

Images