JP2003131799A - System and method for processing information - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress erroneous detection due to the influence of an AC power source which exists in the surroundings when an induction voltage from a human body is detected. SOLUTION: A clock pulse generator 31 supplies a clock pulse with a frequency which is a prescribed multiple of the frequency of a power source synchronizing signal to a frequency divider 33 in synchronization with the power source synchronizing signal of an AC supplied from a power source 39. The frequency divider 33 divides the frequency of the clock pulse, generates a driving pulse and supplies it to a driver 34. The driver 34 impresses the driving pulse respectively to electrodes 3-1 to 3-4 by different phase and drives them. When a living body stands on one of the electrodes 3-1 to 3-4 and is brought into contact with a screen 1, the induction voltage corresponding to the driving pulse is induced by linear electrodes 1Xi and 1Yj via the living body. The induction voltages are detected by an X-electrode detecting part 11 and a Y-electrode detecting part 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information processing apparatus and method, and more particularly to an information processing apparatus and method capable of identifying the presence of a plurality of users by detecting an induced voltage from a human body. .

[0002]

BACKGROUND OF THE INVENTION The applicant of the present invention has proposed a method for identifying a chair or a standing position of a user by detecting an induced voltage from an induction electrode synchronized with a predetermined driving pulse via a user (living body). , For example, Japanese Patent Application No. 2001-295
No. 422 was previously proposed.

[0003]

However, in addition to the above-mentioned induction based on the induction electrode, the user also generates an induction based on a commercial AC power source represented by a fluorescent lamp existing in the vicinity.

As a result, the induction from the commercial AC power source may be erroneously detected as the induction from the above-mentioned induction electrode.

The present invention has been made in view of such a situation, and when detecting an induced voltage from a living body, it is possible to suppress erroneous detection due to the influence of a commercial AC power source existing in the vicinity. To do.

[0006]

An information processing apparatus according to the present invention is based on pulse generating means for generating a drive pulse in synchronization with an AC power supply signal of the information processing apparatus, and a drive pulse generated by the pulse generating means. An induction voltage generating means for generating an induction voltage in synchronization with the drive pulse, an induction means for inducing the induction voltage generated by the induction voltage generating means through the living body, and an induction voltage induced by the induction means. Based on the above, a first detection means for detecting a living body is provided.

The first detecting means may further detect the position where the living body comes into contact, based on the induced voltage induced by the guiding means.

A plurality of induction voltage generating means are provided, and pulse output means for generating and outputting drive pulses of different phases corresponding to the induction voltage generating means based on the drive pulses generated by the pulse generating means. Further, each of the plurality of induced voltage generating means may generate an induced voltage based on the plurality of drive pulses of different phases output by the pulse output means.

Of the plurality of induced voltage generating means, the second detecting means for detecting the one that has generated the induced voltage, the position detected by the first detecting means, and the induction detected by the second detecting means. Display control means for controlling the display of the display screen based on the voltage generating means may be further provided.

Display means for displaying the display screen may be further provided, and the guiding means may be arranged on a predetermined surface of the display means on which the display screen controlled by the display control means is displayed.

According to the information processing method of the present invention, a drive pulse is generated on the basis of a pulse generation step for generating a drive pulse in synchronization with an AC power supply signal of the information processing apparatus and a drive pulse generated by the processing of the pulse generation step. Induced voltage generation step that generates an induced voltage in synchronization with, induced voltage generated by the process of induced voltage generation step, induced step through the living body, and the induced voltage induced by the process of the induced step And a detection step of detecting a living body based on the above.

In the information processing apparatus and method of the present invention, the drive pulse is generated in synchronization with the AC power supply signal of the information processing apparatus, the induced voltage is generated in synchronization with the generated drive pulse, and the generated induction is generated. A voltage is induced through the living body, and the living body is detected based on the induced voltage thus induced.

[0013]

1 shows an example of the configuration of an information input / output system to which the present invention is applied.

The screen 1 is made of a translucent material (for example,
An image is projected from behind by the projector 6 using acrylic as a base material. The screen 1 has a group of linear electrodes which are insulated from each other and arranged in the X and Y directions (the linear electrodes 1X1 to 1Xi and the linear electrodes 1 in FIG. 2).
Y1 to 1Yj) are provided and contacted by the human body 4 as a living body.

In the present invention, 64 linear electrodes Xi (i = 64) are arranged at 1 cm intervals on the screen 1, and 48 linear electrodes Yj are arranged at 1 cm intervals (j = 48).
They are arranged (the screen size is 64 × 48 cm), but of course, these are arbitrary values, and a value according to the fineness of the detection coordinates is used.

The electrodes 3-1 to 3-4 are arranged at positions where the human body 4 is detected. The human body 4 has electrodes 3-1 to 3-4.
Standing on either of the above, and touching the linear electrode group of the screen 1 with a finger or the like, the timing signal control unit 2 causes the electrode 3 to move.
The induced voltage corresponding to the transmission signal (driving pulse) transmitted to -1 to 3-4 is induced to the linear electrode group via the human body 4. This induced voltage is applied to the X electrode detector 11 and Y
The corresponding digital data detected by the electrode detector 12 is supplied to the timing signal controller 2 via the signal line 22.

The timing signal control unit 2 includes a screen 1
The XY coordinates on the screen 1 where the induced voltage is generated are calculated (detected) based on the digital data corresponding to the induced voltage supplied from the signal line 22 from the position where the user stands (electrode 3- Any one of 1 to 3-4) is detected and the detection data is supplied to the personal computer 5.

The timing signal control unit 2 generates a driving pulse and applies it to the electrodes 3-1 to 3-4, respectively, and also generates a sampling pulse in synchronization with the driving pulse and supplies it to the screen 1 through the signal line 23. . The timing signal control unit 2 further generates a control signal in the detection mode or the transfer mode, and the screen 1 via the signal line 24.
Supply to.

The personal computer 5 accepts an input or generates a predetermined image based on the detection data supplied from the timing signal controller 2.
The projector 6 is controlled to project on the screen 1.

The X electrode detecting section 11 includes a linear electrode group (linear electrode 1X in FIG. 2 arranged so as to extend in the X direction.
1 to 1Xi) induced voltage is detected, and corresponding digital data is detected via the signal line 21 and the Y electrode detection unit 12.
It is supplied to the timing signal controller 2.

The Y electrode detector 12 includes a linear electrode group (the linear electrode 1Y in FIG. 2) arranged so as to extend in the Y direction.
The induced voltage of 1 to 1Yj) is detected, and the corresponding digital data is supplied to the timing signal controller 2.

FIG. 2 is a block diagram showing an example of the internal configuration of the information input / output system of FIG.

The power source 39 rectifies and smoothes the commercial AC power source supplied from the plug 40 to generate DC voltages of 5V and 24V. For example, the X electrode detector 11 and the Y electrode detector 1
DC power supply voltage of 5V is supplied to 2 and driver 3
Supply 24V DC power supply voltage to No.4.

Further, the power source 39 generates a power source synchronizing signal whose frequency and phase are synchronized with the signal of the commercial AC power source (50 Hz in the north of Kanto and 60 Hz in the south of Kansai).
The clock pulse generator 31 is supplied via the signal line 39a.

The clock pulse generator 31 is synchronized with the supplied power supply synchronizing signal and has the same frequency as the harmonic of the power supply synchronizing signal (a frequency which is a predetermined multiple of the power supply frequency), for example, 20 KHz (AC power supply frequency of 50 Hz). A clock pulse of 400 times), and the terminals a and c of the switch 32
And to the sampling pulse generator 35. Alternatively, the external clock (EXT CLK) is supplied to the frequency divider 33 and the sampling pulse generator 35 via the terminals b and c of the switch 32.

The clock pulse generator 31 is constructed as shown in FIG.

That is, the clock pulse generator 31 sets the level of the output signal (for example, an AC signal of 20 KHz) from the voltage controlled oscillator (VCO) 42 and the voltage controlled oscillator 42 to CMOS (Com).
The output level converter 43 for converting the level to a level that can be used by the complementary metal oxide semiconductor) and the output signal from the output level converter 43 have a predetermined frequency division ratio (for example, 40
The output signal (50 Hz AC signal) from the frequency divider 44 and the frequency divider 44, which is divided by 0), and the power supply synchronization signal (50 Hz AC signal) from the power source 39 are compared in phase, and both are compared. Phase comparator 45 that generates a signal based on the phase difference of 1 and a low-pass filter 4 that smoothes the output signal from the phase comparator 45
6 and an error amplifier 41 which amplifies the output signal from the low-pass filter 46 by a predetermined magnification and supplies the amplified signal as a control signal to the voltage controlled oscillator 42.

As a result, the voltage controlled oscillator 42 is locked in synchronization with the power supply synchronizing signal (AC power supply voltage) while oscillating at a frequency 400 times 50 Hz (AC power supply frequency), that is, 20 KHz.

That is, the voltage controlled oscillator 42 outputs a 20 KHz clock pulse synchronized with the AC power supply voltage to the outside (switch 32 terminal a) via the output level converter 43.

In the present invention, the absolute time of the clock pulse generated by the voltage controlled oscillator 42 is not required. Therefore, if the frequency of the power supply synchronizing signal input to the phase comparator 45 is changed, the voltage controlled oscillator is changed. 42 is locked in a state of oscillating at a frequency 400 times the variable frequency.

That is, here, the clock pulse generator 3
The frequency of the power supply synchronizing signal input to 1 is 50 Hz, which is the commercial power supply frequency in East Japan, but the frequency is not limited and may be 60 Hz, which is the commercial power supply frequency in West Japan. However, in that case (when the power supply is set to 60Hz),
The clock pulse generated by the clock pulse generator 31 is 24 kHz (400 × 60 Hz).

Returning to FIG. 2, the frequency divider 33 divides the clock pulse supplied from the clock pulse generator 31 via the terminals a and c of the switch 32 to divide the drive pulse having a predetermined frequency. Generate and driver 34
And to the sample mode signal generator 36.

The driver 34 changes the driving pulse supplied from the frequency divider 33 into four driving pulses having different phases,
The electrodes 3-1 to 3-4 are respectively applied and driven.

The electrode 3-1 is the electrode of the channel A (appropriately referred to as CH_A), the electrode 3-2 is the electrode of the channel B (appropriately referred to as CH_B), and the electrode 3-3 is the channel. C electrode (referred to as CH_C as appropriate), electrode 3
-4 is an electrode of channel D (referred to as CH_D as appropriate), which are driven by drive pulses having different phases.

The sampling pulse generator 35 generates a sampling pulse which is synchronized with the clock pulse supplied from the clock pulse generator 31 via the terminals a and c of the switch 32, and is sent to the screen 1 via the signal line 23. Supply. The sample mode signal generator 36 generates a control signal in the detection mode or the data transfer mode in synchronization with the drive pulse supplied from the frequency divider 33, and supplies the control signal to the screen 1 via the signal line 24.

The X electrode detector 11 of the screen 1 is shown in FIG.
It is constructed as shown in. High input impedance amplifier 51Xi (i = 1 to 64) that constitutes the amplifier 51
Receives the input of the induced voltage generated at the linear electrode 1Xi,
The induced voltage is amplified and output to the low pass filters 52, respectively. The low-pass filter 52 smoothes the signal supplied from the high input impedance amplifier 51Xi, and outputs the smoothed signal to one input of the comparator 53Xi.
A reference voltage source 54 is connected to the other input of the comparator 53Xi via a resistor 55, and a predetermined reference voltage is supplied.

As for the predetermined reference voltage supplied from the reference voltage source 54 to the comparator 53Xi via the resistor 55, the comparator 53Xi outputs the output value of the low-pass filter 52 to 2
It is set to a value that can be digitized (for example, 1/2 of the power supply voltage). The comparator 53Xi converts the output of the low-pass filter 52 into digital data by comparing it with a reference voltage, and supplies the digital data to the signal processing unit 56.

The signal processing section 56 includes the comparators 53X.
The digital data supplied from i are each latched to detect the coordinates. Detected data (coordinate data)
Is the data buffer / 232C converter 3 via the signal line 22.
7 is output.

In addition to this, the X-electrode detection section 11 stores the sampling pulse supplied from the sampling pulse generator 35 and the detection signal in the detection mode or the data transfer mode supplied from the sample mode signal generator 36 in the data buffer. Output to the / 232C converter 37.

Since the structure of the Y electrode detecting section 12 is similar to that of the X electrode detecting section 11 described with reference to FIG. 3, the description thereof will be omitted.

Returning to FIG. 2, the data buffer / 232C converter 37 receives the digital data input (DIN), the control signal input in the detection mode or the data transfer mode from the screen 1, and the data buffer / 232C converter 37, as shown in FIG. Upon receiving a sampling pulse input, in the detection mode, the electrodes 3-1 to 3-
4 based on the signal from any one of
It is checked whether i, Yj generate an induced voltage, the result is stored in the shift register 71, and the result is output to the personal computer 5 via the RS232C cable 38 in the data transfer mode (DOUT).

FIG. 6 is a diagram showing an internal configuration of the shift register 71.

As shown in the figure, 8 channels are provided for each channel.
A bit register is provided, and four sets of CH_A to CH_D (4
One processor is composed of 8-bit registers of (channel).

Specifically, one bit corresponds to the linear electrode 1Xi.
Or, it corresponds to one line of 1Yj and has 8 bits (that is,
One processor is composed of blocks that handle eight linear electrodes. Therefore, although only one processor is shown in FIG. 5, in the present invention, the number of linear electrodes 1Xi is six.
Since it is composed of four linear electrodes 1Yj and is composed of 48 linear electrodes 1Yj, in reality, 14 processors (eight processors in the X-direction linear electrode group and Y-direction linear electrodes) are used. The group consists of 6 processors).

Next, the operation of the timing signal controller 2 will be described with reference to the timing chart of FIG.

FIG. 7A shows a sample mode signal generator 36.
7 shows a control signal output from the data buffer / 232C converter 37 when the control signal is at the high level H, and the data buffer / 232C converter 37 is controlled in the detection mode when the control signal is at the low level L. Are controlled in the data transfer mode.

The sample mode signal generator 36 outputs a control signal of high level H for a period of 800 (= 200 × 4) μs, for example. That is, the period of 800 μs is set as the detection section of the induced voltage generated by the linear electrodes Xi and Yj.

FIG. 7B shows a drive pulse applied to the electrode 3-1 (CH_A). The driver 34 is the frequency divider 3
A driving pulse supplied from 3 for one cycle of 200 μs and a period of high level H of 50 μs is applied to the electrode 3-1.

FIG. 7C shows a drive pulse applied to the electrode 3-2 (CH_B). The driver 34 is the frequency divider 3
3 is 200 μs per cycle, the period of high level H is 50 μs, and the driving pulse delayed by 50 μs from the driving pulse applied to the electrode 3-1 is applied to the electrode 3-2. To do.

FIG. 7D shows a drive pulse applied to the electrode 3-3 (CH_C). The driver 34 is the frequency divider 3
3, one cycle is 200 μs, the period of high level H is 50 μs, and the driving pulse applied to the electrode 3-2 is delayed by 50 μs (electrode 3-1).
A drive pulse delayed by 100 μs from the drive pulse applied to the electrode 3) is applied to the electrode 3-3.

FIG. 7E shows a drive pulse applied to the electrode 3-4 (CH_D). The driver 34 is the frequency divider 3
3, one cycle is 200 μs, the period of high level H is 50 μs, and the driving pulse applied to the electrode 3-3 is delayed by 50 μs (electrode 3-1).
A drive pulse delayed by 150 μs from the drive pulse applied to the electrode 3-4) is applied to the electrodes 3-4.

FIG. 7F shows the sampling pulse generator 35.
It shows the sampling pulse output from the. The cycle of this sampling pulse is set to 50 μs (its frequency is set to 20 kHz which is the same cycle as the clock pulse). The rising edge of the sampling pulse (Fig. 7F) is the driving pulse of each channel (Figs. 7B to 7E).
Located in the center of.

The sampling pulse generator 35 generates this sampling pulse in synchronization with the clock pulse supplied from the clock pulse generator 31 via the terminals a and c of the switch 32.

For example, the human body 4 has electrodes 3-1 to 3-4.
If you are not standing on any of the
When standing on any one of -1 to 3-4 but not touching the screen 1, no induction voltage is generated in the linear electrodes 1Xi, 1Yj. In this case, a low level L signal is detected by the X electrode detection unit 11 and the Y electrode detection unit 12, so low level L digital data is input to the data buffer / 232C converter 37.

The data buffer / 232C converter 37 has the X coordinate detecting section 11 and the Y coordinate detecting section at the timing of the rising edge of the sampling pulse (FIG. 7F) while the control signal (FIG. 7A) is at the high level H. The 12 outputs are sampled. In this case, since only low-level L digital data is input, the shift register 71
"0" is stored in the bit registers of each channel.

When the control signal becomes low level L, the data stored in the shift register 71 becomes RS23.
It is transferred to the personal computer 5 via the 2C cable 38. The personal computer 5 judges from the detection data supplied from the timing signal control unit 2 that no input from the user is accepted, and controls the projector 6 so that the display on the screen 1 does not change.

On the other hand, for example, when the human body 4 is the electrode 3
-1 to 3-4, stand on the screen 1
When touched, the induced voltage corresponding to the driving pulse (FIGS. 7B to 7E) is induced through the human body 4 to the linear electrodes 1Xi and 1Yj corresponding to the touched position. In this case, X
The electrode detector 11 and the Y electrode detector 12 detect the induced voltage, and the digital data corresponding to the induced voltage is input to the data buffer / 232C converter 37.

The data buffer / 232C converter 37 has the X coordinate detecting section 11 and the Y coordinate detecting section at the timing of the rising edge of the sampling pulse (FIG. 7F) while the control signal (FIG. 7A) is at the high level H. The 12 outputs are sampled.

Specifically, among the sampling pulses shown in FIG. 7F, whether or not high level H digital data exists at the timing of the rising edges of the first, fifth, ninth and thirteenth sampling pulses. At the timing of the rising edges of the 2nd, 6th, 10th, and 14th sampling pulses, it is checked whether or not there is high-level H digital data.
At the timing of the rising edges of the 7th, 11th and 15th sampling pulses, it is checked whether or not high level H digital data is present, and the 4th, 8th, 12th, 1st
At the timing of the rising edge of the sixth sampling pulse, it is checked whether or not high level H digital data is present.

That is, when high-level H digital data is present at the timing of the rising edges of the first, fifth, ninth and thirteenth sampling pulses of the sampling pulse shown in FIG. An induced voltage corresponding to the applied drive pulse is induced in the linear electrodes 1Xi, 1Yj via the human body 4, and it is determined that the induced voltage is detected by the X electrode detection unit 11 and the Y electrode detection unit 12.

Similarly, when high-level H digital data is present at the timing of the rising edges of the second, sixth, tenth and fourteenth sampling pulses among the sampling pulses shown in FIG. 7F, the electrode 3-2 is used. It is determined that the induced voltage corresponding to the drive pulse applied to the is detected.

Further, when the high-level H digital data exists at the timing of the rising edges of the 3rd, 7th, 11th and 15th sampling pulses, the electrode 3-3 is used.
It is determined that the induced voltage corresponding to the drive pulse applied to the is detected.

Furthermore, at the timing of the rising edges of the 4th, 8th, 12th and 16th sampling pulses,
If high level H digital data is present, the electrodes 3-
It is determined that the induced voltage corresponding to the drive pulse applied to No. 4 is detected.

As described above, according to the present invention, the check is performed four times for each channel in one detection period (a period of 800 μs). This is to improve uncertainty, 4
Most frequently detected (eg 3
Level data (detected more than once) is taken as the data for that channel. That is, when high level H is detected three or more times out of four times, "1" is stored in the bit register of that channel, and when the number of times high level H is detected is two or less, the high level H of that channel is detected. “0” is stored in the bit register.

When the control signal becomes low level L, the data stored in the shift register 71 (bit register) is transferred to the personal computer 5 via the RS232C cable 38.

The timing of data detection and data transfer in the data buffer / 232C converter 37 will now be described with reference to FIG. As shown in the figure, when the human body 4 stands on any of the electrodes 3-1 to 3-4 and touches the screen 1 during the period of 800 μs during which the high-level H control signal is output, the driving is performed. An induced voltage corresponding to the pulse is induced through the human body 4 to the linear electrodes 1Xi, 1Yj, and the induced voltage is applied to the X electrode detection unit 11 and the Y electrode detection unit 12.
Detected in. Then, when the control signal is switched to the low level L, the digital data corresponding to the detected induced voltage is transferred to the personal computer 5 by serial communication. Since the period of serial communication is 24.8 ms, the entire cycle is set to 25.6 ms.

The personal computer 5 controls the projector 6 based on the detection data supplied from the timing signal control section 2 to project a predetermined image on the screen 1.

For example, the trajectory touched by the human body 4 is projected on the screen 1, or the trajectory projected on the screen 1 is determined depending on which electrode of the electrodes 3-1 to 3-4 the human body 4 stands on. The display color can be changed.

FIG. 9 shows an example of a timing chart of an output signal from the X electrode detecting section 11 or the Y electrode detecting section 12.

Specifically, in FIG. 9, the user moves from a place without the induction electrode (induction electrodes 3-1 to 3-4) to a place where the induction electrode exists while the detection electrode is being touched. The example of the timing chart of the detection signal of the detection electrode in the case of doing is shown.

FIG. 9A shows the case where the clock pulse generated by the clock pulse generator 31 is not synchronized with the power supply synchronizing signal, while FIG. 9B shows the case where it is synchronized.

When the user is in the place where the induction electrode does not exist, in both cases of FIG. 9A and FIG. 9B,
An induced voltage signal 81 caused by being induced by a user from a commercial AC power source such as a fluorescent lamp in the surroundings causes
Alternatively, it is output from the Y electrode detection unit 12.

Next, when the user moves to the place where the induction electrode exists, in both cases of FIG. 9A and FIG. 9B, the induction voltage 83 from the user corresponding to the induction electrode is generated.
Are output from the X electrode detection unit 11 or the Y electrode detection unit 12.

In the transient state between the two, an unknown level occurs for a relatively long time, and as shown in FIG. 9A,
The uncertain induction voltage 82 is output from the X electrode detection unit 11 or the Y electrode detection unit 12.

The uncertain induction voltage 82 will be described in detail.

The linear electrode 1Xi (1Y in contact with the human body 4
The induction signals input to the X electrode detection unit 11 (Y electrode detection unit 12) via j) include the induction signal based on the commercial AC power supply and the induction signal based on the induction electrode described above. Induction signals are present simultaneously and at all times.

The input inductive signal, that is, the sum of the inductive signal based on the commercial AC power source and the inductive signal based on the inductive electrode is the high input impedance amplifier 51Xi of the X electrode detecting section 11 (Y electrode detecting section 12). It is amplified by (Yj) and saturated output (0V or 5V output).

Therefore, when the user is in the place where the induction electrode does not exist, the level of the induction signal based on the commercial AC power source input to the X electrode detection unit 11 (Y electrode detection unit 12) is not applied to the induction electrode. The induced voltage signal 81 based on the commercial AC power supply is output because it is much larger than that based on the commercial AC power supply.

On the other hand, when the user moves to the place where the induction electrode exists, the X electrode detection unit 11 (Y
Since the level of the induction signal based on the induction electrode input to the electrode detection unit 12) is set to be much higher than that based on the commercial AC power supply, the induction voltage 83 based on the induction electrode is output.

However, in the transient state between them, the levels of the induction signal based on the commercial AC power and the induction signal based on the induction electrode, which are input to the X electrode detection section 11 (Y electrode detection section 12), are almost the same. At the same level, the output of the sum of these induction signals becomes the uncertain induction voltage 82 and is output from the X electrode detection unit 11 or the Y electrode detection unit 12.

That is, the uncertain induction voltage 82 is an output signal synchronized with the frequency (50 Hz) of the commercial AC power supply (an output signal with respect to an induction input signal based on the commercial AC power supply) and a signal for driving the detection electrode, that is, the above-mentioned. This is a beat in which an output signal synchronized with a drive pulse output from the driver 34 (an output signal based on an inductive input signal based on a conductive pole) is mixed.

This beat, that is, the uncertain induction voltage 82 is
There is a user on the induction electrodes 3-1 to 3-4, and one linear electrode 1Xi (1Yj) is changed to another linear electrode 1Xi + 1.
It is also output during the period during which the finger is moved to (1Yj + 1).

Thus, the reason why the uncertain induction voltage 82 is generated for a long time is that the drive pulse is selected independently of the commercial AC power supply.

Therefore, in the present invention, as described above, the drive pulse is synchronized with the commercial AC power source signal (power source synchronizing signal). As a result, as shown in FIG. 9B, it is possible to suppress the generation of the uncertain induction voltage 82.

As described above, in the information input / output system of the present invention, when the presence of a plurality of users is identified by detecting the induced voltage from the human body, erroneous detection due to the influence of the commercial AC power source existing in the vicinity is suppressed. can do.

FIG. 10 is a diagram showing a configuration example of another information input / output system to which the present invention is applied. The parts corresponding to those in FIG. 2 are designated by the same reference numerals, and the description thereof will be omitted as appropriate.

In this configuration example, the timing signal control unit 2 of the information input / output system of FIG. 2 is further provided with a switch 91 and a frequency divider 92.

That is, when the contact of the switch 91 is switched to the terminal e side, the power supply synchronizing signal supplied from the power supply 39 is the signal line 39a and the terminal d of the switch 91.
And is supplied to the frequency divider 92 via the terminal e.

The frequency divider 92 divides the supplied power supply synchronizing signal to generate a second power supply synchronizing signal having a predetermined frequency and supplies the second power supply synchronizing signal to the clock pulse generator 31.

On the other hand, when the contact of the switch 91 is switched to the terminal f side, the power supply synchronizing signal supplied from the power supply 39 is the signal line 39a and the terminal d of the switch 91.
And the clock pulse generator 31 via the terminal f. That is, the operation of the information input / output system in this case (when the contact of the switch 91 is switched to the terminal f side) is the same as that of FIG.

The other structure is the same as that shown in FIG.

By adopting such a configuration, FIG.
The information input / output device can also support an AC power supply having a frequency higher than the commercial AC power supply frequency, for example, an AC power supply of 400 Hz.

That is, if the frequency division ratio of the frequency divider 92 is selected to be 8 in order to correspond to the AC power supply of 400 Hz, the frequency divider 9
2 can divide the supplied power supply synchronizing signal of 400 Hz to generate the above-mentioned second power supply synchronizing signal of 50 Hz, and can supply it to the clock pulse generator 31.

In order to support a 400 Hz power source,
The manufacturer may select the frequency division ratio of the frequency divider 44 of FIG. 3 to be 50.

In the above description, four electrodes are arranged, but the number of electrodes is not limited to this, and any number of electrodes can be arranged.

The present invention can also be applied to the case of detecting a living body other than the human body.

In this specification, the system means
It represents the entire device composed of multiple devices.

[0098]

According to the information processing apparatus and method of the present invention, a drive pulse is generated in synchronization with a commercial AC power supply signal of the information processing apparatus, and an induced voltage is generated in synchronization with the generated drive pulse. , The generated induced voltage is induced through the living body, and the living body is detected based on the induced voltage. Therefore, when detecting the induced voltage from the user to identify the presence of the user, It is possible to suppress erroneous detection due to the influence of commercial power sources existing in the vicinity.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration example of an information input / output system to which the present invention has been applied.

FIG. 2 is a block diagram showing an internal configuration example of the information input / output system of FIG.

3 is a diagram showing a configuration example of a clock pulse generator 31 of FIG.

FIG. 4 is a diagram showing a configuration example of an X electrode detection unit in FIG.

5 is a diagram illustrating input / output of the data buffer / 232C converter of FIG.

6 is a diagram showing an internal configuration of the shift register of FIG.

FIG. 7 is a timing chart explaining the operation of the timing signal control unit of FIG.

FIG. 8 is a diagram for explaining the timing of data detection and data transfer in the data buffer / 232C converter of FIG.

9 is an X electrode detection unit 11 or a Y electrode detection unit 12 of FIG.
3 is a timing chart of output signals from the.

FIG. 10 is a diagram showing a configuration example of another information input / output system to which the present invention has been applied.

[Explanation of symbols]

1 acrylic screen, 2 timing signal control section, 3-1 to 3-4 electrodes, 4 human body, 5 personal computer, 6 projector, 11 X electrode detection section, 12 Y electrode detection section, 31 clock pulse generator, 33 frequency division Vessel, 34 driver, 35
Sample pulse generator, 36 sample mode signal generator, 37 data buffer / 232C converter, 39
Power supply

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 2F063 AA03 BA29 BB02 BB08 DA02                       DA05 DC08 DD02 FA09 KA02                       LA01 LA06 LA07 LA19                 2G005 CA01                 5B068 BB14 BC13 BE03                 5B087 AA02 AC12 AE03 CC25 CC32

Claims (6)

[Claims] 1. A pulse generating means for generating a drive pulse in synchronization with an AC power supply signal of an information processing apparatus, and a drive pulse generated by the pulse generating means, in synchronization with the drive pulse, Induction voltage generation means for generating an induction voltage, the induction voltage generated by the induction voltage generation means, induction means for inducing through the living body, based on the induction voltage induced by the induction means, the An information processing apparatus comprising: a first detection unit that detects a living body. 2. The information according to claim 1, wherein the first detecting means further detects a position where the living body comes into contact, based on the induced voltage induced by the inducing means. Processing equipment. 3. The induced voltage generating means is provided in plurality, and generates drive pulses of different phases corresponding to the induced voltage generating means based on the drive pulses generated by the pulse generating means. And further comprising pulse output means for outputting, wherein each of the plurality of induced voltage generating means generates the induced voltage based on the plurality of drive pulses of different phases output by the pulse output means. The information processing apparatus according to claim 2, wherein the information processing apparatus is provided. 4. A second detecting means for detecting one of the plurality of induced voltage generating means that has generated the induced voltage, the position detected by the first detecting means, and the second detecting means. The information processing apparatus according to claim 3, further comprising display control means for controlling display of a display screen based on the induced voltage generation means detected by the detection means. 5. A display means for displaying the display screen is further provided, and the guiding means is arranged on a predetermined surface of the display means on which the display screen controlled by the display control means is displayed. The information processing apparatus according to claim 4, wherein: 6. An information processing method for an information processing apparatus, comprising: a pulse generating step for generating a driving pulse in synchronization with an AC power supply signal of the information processing apparatus; An induction voltage generating step of generating an induction voltage in synchronization with the drive pulse; and an induction step of inducing the induction voltage generated by the process of the induction voltage generating step through a living body, A detecting step of detecting the living body based on the induced voltage induced by the process of the inducing step.