KR101757735B1 - Position detecting system using infrared ray and ultrasonic wave and position detecting method thereof - Google Patents

Abstract

The present invention provides a display device comprising: a display device for displaying an image; Interface means for receiving an instruction and transmitting infrared and ultrasonic waves to the display device; A plurality of receivers for receiving the infrared rays and the ultrasonic waves; And a control unit for calculating position information of the interface unit using the infrared ray and the arrival time difference of the ultrasonic waves.

Description

TECHNICAL FIELD [0001] The present invention relates to a position detection system and a position detection method using an infrared ray and an ultrasonic wave,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a position detection system, and more particularly, to a position detection system and a position detection method for detecting position information using a speed difference between an infrared ray and an ultrasonic wave.

In the conventional television, a user interface (UI) using a remote controller is still dominant. However, due to the development of a smart phone and the like, an integrated computer or television system such as a smart television has been researched and developed, A new user interface that can be applied to such an integrated system is required.

Several new user interfaces that can be applied to such an integrated system have been proposed. For example, there are a user interface for recognizing a command by sensing a voice, a user interface for recognizing a command by sensing a gesture, And a user interface for recognizing commands by using an embedded object, and a method of downloading an application of a smart phone and using the remote control as a remote control has been proposed.

In the case of a user interface for recognizing a gesture of a user and recognizing a command, the user interface is able to be controlled by using the most familiar and intuitive means of human motion.

Such a user interface must be able to recognize the three-dimensional coordinate and three-dimensional coordinate change of the interface means carried by the user with the user interface in order to detect the gesture. In order to recognize the three-dimensional coordinate of the interface means, depth camera (DC) and stereo vision triangulation method, which are represented by a single camera (SC), a time-of-flight (TOF) camera, a charge coupled device And a method of obtaining depth information (distance information between the measuring part and the object) (stereo camera: STC).

However, the method using a CCD camera has a disadvantage in that it is difficult to accurately detect a gesture because it is a method of calculating two-dimensional coordinates using only simple image information without depth information, and a method using a depth camera requires an expensive depth camera such as a TOF camera Therefore, there is a difficulty in commercialization.

In addition, the method using stereo vision is vulnerable to changes in the environment, such as changes in external light, and requires a large amount of computation in the search and comparison process for detecting depth information, so that it takes a long time to detect depth information and accuracy There is a falling problem.

The present invention relates to a method and apparatus for quickly and accurately detecting the position information of an interface means by calculating a distance between a receiving unit and an interface means using a difference in speed between an infrared ray and an ultrasonic wave and a position using an infrared ray and an ultrasonic wave for easily recognizing various gestures of a user An object of the present invention is to provide a detection system and a position detection method.

Further, the present invention is characterized in that the receiving unit for receiving the infrared rays and the ultrasonic waves calculates the arrival time difference of the infrared rays and the ultrasonic waves and transmits them to the control unit, and the control unit calculates the position information of the interface means using the arrival time difference of the infrared rays and the ultrasonic waves, Another object of the present invention is to provide a position detection system and a position detection method using an infrared ray and an ultrasonic wave in which position information calculation time is reduced and stability of position information calculation is improved.

In order to achieve the above object, the present invention provides a display device comprising: a display device for displaying an image; Interface means for receiving an instruction and transmitting infrared and ultrasonic waves to the display device; A plurality of receivers for receiving the infrared rays and the ultrasonic waves; And a control unit for calculating position information of the interface unit using the infrared ray and the arrival time difference of the ultrasonic waves.

Here, the control unit may calculate the three-dimensional coordinates of the interface means and the three-dimensional coordinates from the arrival time difference and the coordinates of the plurality of receiving units using the triangulation method.

The control unit includes: a source signal generator for receiving an analog infrared signal and an analog ultrasound signal from the plurality of receivers and generating a digital infrared signal, a digital ultrasound signal, a clear signal, and a delay signal; A timer unit for generating a counter start signal, a counter end signal, and a counter output start signal using the digital ultrasound signal, the clear signal, and the delay signal; A counter unit for generating a counter signal by using the counter start signal, the counter end signal, and the counter output start signal; And an arithmetic unit for calculating the arrival time difference in each of the plurality of receiving units using the serial counter signal and calculating the three-dimensional coordinates of the interface unit using the arrival time difference.

The source signal generator may further include a digital signal generator for generating the digital infrared signal and the digital ultrasound signal using the analog infrared signal and the analog ultrasound signal, And a delay signal generation unit for generating the delay signal using the digital ultrasound signal and the M clock, wherein the timer unit is operable to generate the delay signal by using the clear signal and the delay signal, A start signal generator for generating a start signal, a end signal generator for generating the counter end signal using the digital ultrasound signal and the clear signal, and a stop signal generator for generating the counter output start signal An output start signal generating unit And the counter unit includes a counting unit for generating a counter signal by using the counter start signal, the counter end signal, and the M clock, and a counting unit for counting the counted counter output signal and the SR clock, And the like.

Each of the plurality of receiving units includes an analog signal generating unit for receiving the infrared rays and the ultrasonic waves from the interface means and generating an analog infrared signal and an analog ultrasonic signal; A source signal generator for receiving the analog infrared signal and the analog ultrasound signal from the analog signal generator and generating a digital infrared signal, a digital ultrasound signal, a clear signal, and a delay signal; A timer unit for generating a counter start signal, a counter end signal, and a counter output start signal using the digital ultrasound signal, the clear signal, and the delay signal; And a counter unit for generating a counter signal by using the counter start signal, the counter end signal, and the counter output start signal.

The source signal generator may further include a digital signal generator for generating the digital infrared signal and the digital ultrasound signal using the analog infrared signal and the analog ultrasound signal, And a delay signal generation unit for generating the delay signal using the digital ultrasound signal and the M clock, wherein the timer unit is operable to generate the delay signal by using the clear signal and the delay signal, A start signal generator for generating a start signal, a end signal generator for generating the counter end signal using the digital ultrasound signal and the clear signal, and a stop signal generator for generating the counter output start signal An output start signal generating unit And the counter unit includes a counting unit for generating a counter signal by using the counter start signal, the counter end signal, and the M clock, and a counting unit for counting the counted counter output signal and the SR clock, And the like.

The digital signal generating unit may include a first inverter receiving the analog infrared signal and outputting the digital infrared signal, and second and third inverters connected in series for receiving the analog ultrasound signal and outputting the digital ultrasound signal, Wherein the clear signal generator includes a first flip-flop for receiving the digital infrared signal and the M clock and outputting a delayed digital infrared signal and an inverted delay digital infrared signal delayed by one M clock, And a NAND gate receiving the digital infrared signal and the digital infrared signal and outputting the clear signal, wherein the delay signal generator receives the digital ultrasound signal and the M clock, and receives the digital ultrasound signal and the M clock, A second flip-flop for outputting a delayed digital ultrasonic signal, May include a flop-receives the open digital ultrasonic signals and said M second flip clock and outputting a delayed signal delayed by the second of the M clocks.

The start signal generator includes a first flip-flop that receives the power supply voltage signal and the delay signal and outputs the counter start signal. The end signal generator generates the end signal according to the power supply voltage signal and the digital ultrasound signal And a second flip-flop for receiving the output of the counter and outputting the counter end signal. The output start signal generator includes a third flip-flop for receiving the power supply voltage signal and the delay signal and outputting the output start signal can do.

The counting unit may include a binary counter that receives the counter start signal, the counter end signal, and the M clock, and outputs the counter signal. The output unit may output the counter signal, And a shift register for receiving the start signal and the SR clock and outputting the sequential counter signal.

According to another aspect of the present invention, there is provided a wireless communication method, comprising: a step in which an interface unit receives an instruction and transmits an infrared ray and an ultrasonic wave; A plurality of receiving units receiving the infrared rays and the ultrasonic waves; And calculating the position information of the interface means using the infrared and ultrasound arrival time differences.

In the position detection system and the position detection method using infrared rays and ultrasonic waves according to the present invention, the distance between the receiving unit and the interface unit is calculated using the difference between the speeds of the infrared rays and the ultrasonic waves, Various gestures of the user can be easily recognized.

In addition, the receiving unit for receiving the infrared rays and the ultrasonic waves calculates the arrival time difference of the infrared rays and the ultrasonic waves and transmits them to the control unit, and the control unit calculates the position information of the interface means by using the arrival time difference of the infrared rays and the ultrasonic waves, And the stability of position information calculation can be improved.

1 is a perspective view showing a position detection system using an infrared ray and an ultrasonic wave according to a first embodiment of the present invention;
2 is a view showing a control unit of a position detection system using an infrared ray and an ultrasonic wave according to a first embodiment of the present invention.
3 is a perspective view illustrating a position detection system using an infrared ray and an ultrasonic wave according to a second embodiment of the present invention.
4 is a view showing each receiving part of a position detection system using infrared rays and ultrasonic waves according to a second embodiment of the present invention.
5A and 5B are diagrams illustrating a digital signal generator, a clear signal generator, and a delay signal generator of the position detection system according to the second embodiment of the present invention, respectively.
6A to 6C are diagrams illustrating a start signal generator, a termination signal generator, and an output start signal generator of the position detection system according to the second embodiment of the present invention, respectively.
7A and 7B illustrate a counting unit and an output unit of the position detecting system according to the second embodiment of the present invention, respectively.
8 is a diagram showing waveforms of various signals in a position detection system according to a second embodiment of the present invention;

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 is a perspective view illustrating a position detection system using infrared rays and ultrasonic waves according to a first embodiment of the present invention.

1, the position detection system 10 includes a display device 20 for displaying an image, an interface means 30 for inputting a command for controlling the display device 20, And a control unit 50 connected to the display device 20 and the plurality of receiving units 40. The display unit 20 includes a plurality of receiving units 40,

The display device 20 displays an image and displays the execution result of the recognized command through the interface means 30, for example, it may be a smart television.

The interface means 30 is spaced apart from the front surface of the display device 20. The interface means 30 receives the user's commands and displays the information on the display device 20 in the form of an infrared ray (IR) ray and an ultrasonic wave (US wave) .

That is, the interface means 30 transmits infrared and ultrasonic waves at the changed positions according to the gesture of the user, thereby transmitting the position information corresponding to the gesture to the plurality of receiving portions 40. For this purpose, an infrared transmitting portion (not shown) And a transmitting unit (not shown).

Here, the positional information of the interface means 30 may mean a change of three-dimensional coordinates and three-dimensional coordinates of an arbitrary point of the interface means 30. For example, the three-dimensional coordinates of the infrared transmitting unit or the ultrasonic transmitting unit and the three- It may be a change of the dimensional coordinates.

The plurality of receiving units 40 receive the infrared rays and the ultrasonic waves transmitted from the interface means 30 and transmit the infrared rays and the ultrasonic waves to the control unit 50. For this purpose, the plurality of receiving units 40 include first to third receiving units 42, 44, 46).

That is, the first to third receiving units 42, 44, and 46 receive the infrared and ultrasonic waves transmitted from the interface unit 30, respectively, and transmit the first to third analog infrared signals (AIR in FIG. 2) 3 analogue ultrasonic signal (AUS in Fig. 2), and transmits the generated analog signal to the control unit 50. [0050]

Since the infrared rays are transmitted at a speed of about 300,000 km / hr to about 8,300 m / sec. And the ultrasonic waves are transmitted at a sonic speed of about 340 m / sec, the infrared rays received by the first to third receiving units 42, The ultrasonic waves have first to third arrival time differences according to distances between the first to third receiving units 42, 44, and 46 and the interface means 30, respectively.

The control unit 50 calculates the position information of the interface unit 30 using the analog signals received from the plurality of receiving units 40.

1 shows the control unit 50 disposed outside the display device 20, the control unit 50 may be incorporated in the display device 20 in another embodiment.

The control unit 50 analyzes the calculated position information to recognize the gesture of the user, controls the display device 20 according to the recognized gesture or executes a command of the user to output the execution result to the display device 20 Can be output.

The control unit 50 calculates an arrival time difference between the infrared rays and the ultrasonic waves received by the plurality of receiving units 40 from the analog signals generated by the plurality of the receiving units 40, Dimensional coordinates of the interface means 30 are calculated from the distance between the plurality of receiving units 40 and the interface means 30 and the three dimensional coordinates of the plurality of receiving units 40 do.

For example, when the luminous flux and the sound velocity are c and v, respectively, and the first to third arrival time differences of the infrared ray and the ultrasonic wave received by the first to third receiving sections 42, 44 and 46 are denoted by? T1,? T2, The distances R1, R2 and R3 between the first to third receiving sections 42, 44 and 46 and the interface means 30 can be calculated by the following equations.

R1 = cv? T1 / (c - v),

R2 = cv? T2 / (c - v),

R3 = cv? T3 / (c - v)

When the three-dimensional coordinates of the first to third receiving units 42, 44 and 46 are assumed to be (a1, b1, c1), (a2, b2, c2), (a3, b3, c3) (X, y, z) of the three-dimensional coordinate system 30 can be calculated by the following three-element second-order simultaneous equations.

(x - a1) ² + (y - b1) ² + (z - c1) ² = R1 ² ,

^{(x - a2) 2 + (} y - b2) 2 + (z - c2) 2 = R2 2,

(x - a3) ² + (y - b3) ² + (z - c3) ² = R3 ²

Therefore, the three-dimensional coordinates of the interface means 30 can be calculated by detecting the arrival time difference from the infrared rays and the ultrasonic waves received by the first to third receiving portions 42, 44, and 46.

Here, such a method is called a triangulation method. In order to calculate coordinates by the triangulation method, the receiving unit 40 must include at least three receiving units.

The three-dimensional coordinates of the first to third receiving units 42, 44 and 46 and the three-dimensional coordinates of the interface means 30 can be set on the basis of an arbitrary origin. For example, Can be set as the origin.

The configuration of the control unit 50 will be described with reference to the drawings.

2 is a view showing a control unit of a position detection system using an infrared ray and an ultrasonic wave according to a first embodiment of the present invention, and will be described with reference to FIG.

2, the control unit 50 of the position detection system 10 includes a source signal generation unit 60, a timer unit 70, a counter unit 80, and a calculation unit 90 For example, a processor such as a micro controller unit (MCU).

The source signal generating unit 60 receives the analog infrared signal AIR and the analog ultrasonic signal AUS from the plurality of receiving units 40 to generate the digital infrared signal IR and the digital ultrasound signal US, Generates a clear signal CLR and a delay signal US "using the digital infrared signal IR and the digital ultrasound signal US and generates the digital ultrasound signal US, the clear signal CLR and the delayed signal US & US ") to the timer unit 70.

The source signal generator 60 includes a digital signal generator 62 for generating a digital infrared signal IR and a digital ultrasound signal US with an analog infrared signal AIR and an analog ultrasound signal AUS, A clear signal generator 64 for generating a clear signal CLR by using a digital infrared signal IR and an M clock M_CLK and a delay circuit 62 for delaying the delay signal S by using a digital ultrasound signal US and an M clock M_CLK. And a delay signal generator 66 for generating a delay signal US "

Here, the M clock (M_CLK) may be supplied from the control unit 50.

The timer unit 70 generates a counter start signal CCLR, a counter end signal RCLK, and a counter signal RCLK using the digital ultrasound signal US, clear signal CLR, delay signal US "and power supply voltage signal VCC. And outputs the generated counter start signal CCLR, the counter end signal RCLK, and the counter output start signal INT / Load to the counter unit 80. [

The timer section 70 includes a start signal generating section 72 for generating a counter start signal CCLR using the clear signal CLR and the delay signal US " An end signal generator 74 for generating a counter end signal RCLK by using the clear signal CLR and a counter output start signal INT / Load by using the clear signal CLR and the delay signal US " And an output start signal generating unit 76 for generating an output start signal.

The counter 80 generates the successive counter signal SCTR using the counter start signal CCLR, the counter end signal RCLK and the counter output start signal INT / Load, To the arithmetic unit (90).

To this end, the counter 80 includes a counting unit 82 for generating a counter signal CTR using the counter start signal CCLR, the counter end signal RCLK, and the M clock M_CLK, And an output unit 84 for generating a sequential counter signal SCTR by using a counter output signal CTR, a counter output start signal INT / Load and an SR clock SR_CLK.

Here, the M clock (M_CLK) and the SR clock (SR_CLK) may be supplied from the controller (50).

The calculation unit 90 calculates the arrival time differences of the infrared rays and the ultrasonic waves from the plurality of reception units 40 from the successive counter signal SCTR and outputs the three dimensional coordinates (x, y , z) are calculated and output.

The source signal generator 60 generates a digital ultrasound signal US, a clear signal CLR, and a delay signal (hereinafter, referred to as " delay signal ") necessary for detecting the arrival time difference of infrared rays and ultrasonic waves, US ").

The timer unit 70 uses a digital ultrasound signal US, a clear signal CLR and a delay signal US "to generate a counter start signal CCLR for designating a counting start point and a count end point, Signal RCLK and generates a counter output start signal INT / Load for designating the output timing of the counter signal CTR.

The counter 80 generates a counter signal CTR corresponding to the number of clocks corresponding to the arrival time difference using the counter start signal CCLR and the counter end signal RCLK and outputs the counter output start signal INT / The counter signal CTR is sequentially transferred to the counter signal SCTR according to the load signal (Load).

Finally, the operation unit 90 sequentially calculates the three-dimensional coordinates (x, y, z) of the interface means 30 using the sequentially transmitted counter signals CTR and sequentially calculates the three- x, y, z) of the interface means 30 and recognizes the user's gesture by interpreting the positional change.

Therefore, in the infrared and ultrasound-based position detection system 10 according to the first embodiment of the present invention, the distance between the plurality of reception units 40 and the interface means 30 is calculated from the arrival time difference of the infrared ray and the ultrasonic wave, It is possible to quickly and accurately detect the three-dimensional coordinates of the interface means 30 from the distance between the plurality of receiving units 40 and the interface means 30 and consequently to easily recognize the various gestures of the user and the corresponding commands .

In the position detecting system according to the first embodiment of the present invention, the control unit 50 receives the infrared rays and the ultrasonic waves from each of the plurality of receiving units 40, A timer section 70, a counter section 80 and an arithmetic section 90, for example, for calculating the distance of the interface section 30 and the coordinates of the interface section 30, Circuit portion.

Therefore, the configuration of the control unit 50 becomes complicated, and the possibility of malfunction can be increased.

Since it takes a long time to calculate the coordinates of the interface means 30 by a large amount of calculation, it is difficult to calculate the coordinates of the interface means 30 in real time. As a result, there is a problem in the change of the position of the interface means and hence the gesture recognition of the user Lt; / RTI >

In order to solve such a problem, a plurality of receiving units can process a part of the calculations of the control unit, which will be described with reference to the drawings.

3 is a perspective view showing a position detection system using infrared rays and ultrasonic waves according to a second embodiment of the present invention.

3, the position detection system 110 includes a display device 120 for displaying an image, an interface means 130 for inputting a command for controlling the display device 120, And a control unit 150 connected to the display device 120 and the plurality of reception units 140. The display unit 120 includes a plurality of display units 120,

The display device 120 displays an image and displays the execution result of the recognized command through the interface means 130, for example, it may be a smart television.

The interface means 130 is spaced apart from the front surface of the display device 120. The interface means 130 receives the user's commands and displays the information on the display device 120 in the form of an infrared ray (IR) ray and an ultrasonic wave (US wave) .

That is, the interface unit 130 transmits infrared and ultrasonic waves at the changed positions according to the gesture of the user, thereby transmitting the position information corresponding to the gesture to the plurality of receiving units 140. To this end, the infrared transmitting unit (not shown) And a transmitting unit (not shown).

Here, the position information of the interface means 130 may mean a change of three-dimensional coordinates and three-dimensional coordinates of an arbitrary point of the interface means 130. For example, the three-dimensional coordinates of the infrared transmitting unit or the ultrasonic transmitting unit and the three- It may be a change of the dimensional coordinates.

The plurality of receiving units 140 receive the infrared rays and the ultrasonic waves transmitted from the interface means 130 and calculate the arrival time differences of the received infrared rays and the ultrasonic waves and transmit the calculated arrival time differences to the control unit 150. For this purpose, Includes first to third receiving units (142, 144, 146).

Each of the first to third receiving units 142, 144, and 146 receives infrared and ultrasonic waves transmitted from the interface unit 130 and outputs first to third analog infrared signals (AIR in FIG. 4) (AUS in Fig. 4), generates a counter signal (CTR in Fig. 4) corresponding to the arrival time difference of infrared and ultrasonic waves using the generated analog signal, and sequentially generates a counter signal (50).

Since the infrared rays are transmitted to the light beam and the ultrasonic waves are transmitted at the sound velocity, the infrared rays and the ultrasonic waves received by the first to third receiving units 142, 144 and 146 are transmitted to the first to third receiving units 142, And the first to third arrival time differences, respectively, depending on the distance between the first and second means.

The control unit 150 calculates the position information of the interface unit 130 using the arrival time difference received from the plurality of receiving units 140.

Since each of the plurality of receiving units 140 calculates the arrival time difference of infrared and ultrasonic waves and the control unit 150 calculates the coordinates of the interface unit 130 using the arrival time difference calculated by each of the plurality of receiving units, It is possible to accurately calculate the coordinates of the interface means 130 in real time and accurately recognize the change of the position of the interface means and the gesture of the user can do.

3, the control unit 150 is disposed outside the display device 120. However, in another embodiment, the control unit 150 may be embedded in the display device 120. [

The control unit 150 analyzes the calculated position information to recognize the gesture of the user, controls the display device 120 according to the recognized gesture or executes a command of the user to output the execution result to the display device 120 Can be output.

The control unit 150 calculates a distance between the plurality of reception units 140 and the interface unit 130 based on the arrival time difference generated by the plurality of reception units 140 and then calculates the distance between the plurality of reception units 140 and the interface unit 130 130 of the interface unit 130 and the three-dimensional coordinates of the plurality of receiving units 140.

The three-dimensional coordinate calculation of the interface means 30 by such a triangulation method is the same as that of the first embodiment, and a detailed description thereof will be omitted.

The configuration of the plurality of receiving units 150 will be described with reference to the drawings.

FIG. 4 is a view showing each receiving portion of the infrared and ultrasound-based position detection system according to the second embodiment of the present invention, and will be described with reference to FIG.

4, each of the plurality of reception units 140 of the position detection system 110 includes an analog signal generation unit 160, a source signal generation unit 170, a timer unit 180, and a counter unit 190.

The analog signal generating unit 160 receives infrared rays and ultrasonic waves from the interface means 130 to generate an analog infrared signal AIR and an analog ultrasonic signal AUS and outputs the generated analog infrared signal AIR and analog ultrasonic signals AUS) to the source signal generator 170.

The source signal generator 170 receives the analog infrared signal AIR and the analog ultrasonic signal AUS from the analog signal generator 160 and generates the digital infrared signal IR and the digital ultrasound signal US, (US), a clear signal (CLR) and a delayed signal (USR) using the digital infrared signal IR and the digital ultrasound signal US, (US ") to the timer unit 180.

The source signal generator 170 includes a digital signal generator 172 for generating the digital infrared signal IR and the digital ultrasound signal US from the analog infrared signal AIR and the analog ultrasound signal AUS, A clear signal generator 174 for generating a clear signal CLR by using a digital infrared signal IR and an M clock M_CLK and a delay circuit 174 for delaying the delayed signal by using a digital ultrasound signal US and an M clock M_CLK. And a delay signal generator 176 for generating a delay signal US "

Here, the M clock (M_CLK) may be supplied from the controller 150.

The timer unit 180 generates a counter start signal CCLR, a counter end signal RCLK and a counter signal RCLK by using the digital ultrasound signal US, the clear signal CLR and the delay signal US "and the power supply voltage signal VCC. And outputs the generated counter start signal CCLR, counter end signal RCLK, and counter output start signal INT / Load to the counter unit 190. [

The timer 180 includes a start signal generator 182 for generating a counter start signal CCLR using the clear signal CLR and the delay signal US " An end signal generator 184 for generating a counter end signal RCLK using the clear signal CLR and a counter output start signal INT / Load using the clear signal CLR and the delay signal US " And an output start signal generator 186 for generating an output start signal.

The counter 190 generates the successive counter signal SCTR using the counter start signal CCLR, the counter end signal RCLK and the counter output start signal INT / Load, To the control unit 150.

The counter 190 includes a counting unit 192 for generating a counter signal CTR by using a counter start signal CCLR, a counter end signal RCLK and an M clock M_CLK, And an output unit 194 for generating a sequential counter signal SCTR by using a counter output signal (CTR), a counter output start signal (INT / Load), and an SR clock (SR_CLK).

Here, the M clock (M_CLK) and the SR clock (SR_CLK) may be supplied from the controller (150).

In this manner, each of the plurality of receiving units 140 generates and transmits a sequential counter signal SCTR corresponding to the arrival time difference of infrared and ultrasonic waves to the control unit 150, Dimensional coordinates (x, y, z) of the interface means 130 using the extracted arrival time difference and outputs the three-dimensional coordinates (x, y, z) of the interface means 130 using the extracted arrival time difference.

The analog signal generating unit 160 receives the infrared ray and the ultrasonic wave and outputs the analog infrared ray signal AIR and the analog ultrasound signal AUS to the receiving unit 140 and the controller 150, .

The source signal generator 170 generates a digital signal IR, a digital ultrasound signal US, and a clear signal IR necessary for detecting an arrival time difference between infrared rays and ultrasonic waves using the analog infrared signal AIR and the analog ultrasound signal AUS. And generates a signal CLR and a delay signal US ".

The timer unit 180 uses a digital ultrasound signal US, a clear signal CLR and a delay signal US "to generate a counter start signal CCLR for specifying a counting start point and a count end point, Signal RCLK and generates a counter output start signal INT / Load for designating the output timing of the counter signal CTR.

The counter unit 190 generates a counter signal CTR corresponding to the number of clocks corresponding to the arrival time difference using the counter start signal CCLR and the counter end signal RCLK and outputs the counter output start signal INT / Load), the counter signal CTR is sequentially transmitted.

Finally, the control unit 150 sequentially calculates the three-dimensional coordinates (x, y, z) of the interface unit 130 using the sequentially transmitted counter signals CTR and sequentially calculates the three- x, y, z) of the interface means 130, and recognizes the gesture of the user by interpreting the position change.

Therefore, in the infrared and ultrasound-based position detection system 110 according to the second embodiment of the present invention, each of the plurality of receiving units 140 calculates the arrival time difference of the infrared rays and the ultrasonic waves, and the controller 150 controls the infrared Dimensional coordinates of the interface means 130 are calculated from the distance between the plurality of receiving units 140 and the interface means 130 by calculating the distance between the plurality of receiving units 140 and the interface means 130 from the arrival time difference of the interface means 130, Therefore, it is possible to quickly and accurately detect the coordinate and position changes of the interface means 130, and as a result, it is possible to easily recognize the various gestures of the user and the corresponding commands.

The source signal generator 170, the timer 180, and the counter 190 included in each of the plurality of receiving units 140 may be configured as digital circuits, which will be described with reference to the drawings.

5A and 5B are diagrams showing a digital signal generating unit, a clear signal generating unit, and a delay signal generating unit of the position detecting system according to the second embodiment of the present invention, respectively. FIGS. 6A to 6C are diagrams 7A and 7B are diagrams illustrating a start signal generating unit, a stop signal generating unit and an output start signal generating unit of the position detecting system according to the second embodiment, 8 shows waveforms of various signals of the position detection system according to the second embodiment of the present invention, which will be described with reference to FIGS. 3 and 4. FIG.

5A, the digital signal generating unit 172 includes an inverter for receiving an analog infrared signal AIR and outputting a digital infrared signal IR, and a digital-to-analog converter for receiving the analog ultrasonic signal AUS, And two inverters serially connected to output the output (US).

8, the digital infrared signal IR and the digital ultrasound signal US output from the digital signal generating unit 172 include pulses having the same period T and different phases from each other , And the pulses of the digital infrared signal IR and the digital ultrasound signal US have a phase difference corresponding to the arrival time difference DELTA t.

In other words, the interface means 130 transmits infrared rays and ultrasonic waves including pulses of the same phase, but is transmitted at the speed of light and sound speed, respectively, so that the plurality of receivers 140 arrive at different times.

Thus, the pulses of the digital infrared signal IR and the digital ultrasound signal US have a phase difference corresponding to the arrival time difference DELTA t.

5B, the clear signal generator 174 receives the digital infrared signal IR and the M clock M_CLK and outputs a delayed digital infrared signal IR 'delayed by 1 M clock (M_CLK) A flip-flop for outputting the delayed digital infrared signal IR ', a NAND circuit for receiving the inverted delay digital infrared signal IR'B and the digital infrared signal IR and outputting the clear signal CLR, Gate (NAND gate).

8, the clear signal CLR output from the clear signal generation section 174 is synchronized with the rising edge of the digital infrared signal IR and is supplied to the low potential And has a function of resetting the start signal generating unit 182, the end signal generating unit 184 and the output start signal generating unit 186 of the timer unit 180.

5C, the delay signal generator 176 receives the digital ultrasound signal US and the M clock M_CLK and outputs a delayed digital ultrasound signal US 'delayed by 1 M clock (M_CLK) And a flip-flop for receiving a delayed digital ultrasound signal US 'and an M clock M_CLK and outputting a delayed signal US' delayed by 2M clocks M_CLK.

8, the delay signal US "outputted from the delay signal generation section 176 has a waveform in which the digital ultrasound signal US is delayed by 2 M clock (M_CLK), and the counter start signal CCLR (Rising edge) of the counter output start signal (INT / Load) and the rising edge of the high output voltage of the counter output start signal (INT / Load).

6A, the start signal generator 182 includes a first flip-flop FF1 that receives the power supply voltage signal VCC and the delay signal US "and outputs a counter start signal CCLR, .

8, the counter start signal CCLR output from the start signal generator 182 is converted to a high potential voltage in synchronization with the rising edge of the digital infrared signal IR, Has a waveform that is synchronized with the rising edge of the clock signal US "and is converted into a low potential voltage, and serves as a reference for starting the counting of the counter unit 190. [

6B, the end signal generator 184 includes a second flip-flop FF2 that receives the power supply voltage signal VCC and the digital ultrasound signal US and outputs a counter end signal RCLK, .

8, the counter end signal RCLK output from the end signal generator 184 is converted to a high potential voltage in synchronization with the rising edge of the digital ultrasound signal US, Has a waveform that is synchronized with the rising edge of the signal IR and is converted to a low potential voltage and plays a role of a reference for the counting end time of the counter unit 190. [

6C, the output start signal generating section 186 includes a third flip-flop for receiving the power supply voltage signal VCC and the delay signal US "and outputting an output start signal INT / (FF3).

8, the output start signal INT / Load output from the output start signal generating section 186 is synchronized with the rising edge of the delay signal US "to be converted to a high potential voltage And has a waveform that is synchronized with the rising edge of the digital infrared signal IR and converted to a low potential voltage and acts as a reference for outputting the counter signal CTR of the counter unit 190.

The first to third flip-flops FF1, FF2 and FF3 are reset by the clear signal CLR and as a result are output from the first to third flip-flops FF1, FF2 and FF3 The counter start signal CCLR, the counter end signal RCLK and the counter output start signal INT / Load are set to the falling edge of the clear signal CLR, that is, the rising edge of the digital infrared signal IR rising edge, and is converted to a high-potential voltage or a low-potential voltage.

7A, the counting unit 192 receives a counter start signal CCLR, a counter end signal RCLK, and an M clock M_CLK and outputs a counter signal CTR. counter.

That is, the binary counter starts counting in accordance with the counter start signal CCLR, terminates the counting in accordance with the counter end signal RCLK, and outputs the counter signal CTR corresponding to the counted number of M clocks M_CLK .

Here, since the counter start signal CCLR and the counter end signal RCLK correspond to the rising edges of the digital infrared signal IR and the digital ultrasonic signal US, respectively, the number of counted M clocks M_CLK Corresponds to the arrival time difference DELTA t of the digital infrared signal IR and the digital ultrasound signal US.

7B, the output unit 194 includes a shift register (not shown) for receiving the counter signal CTR, the counter output start signal INT / Load, and the SR clock SR_CLK and outputting the successive counter signal SCTR, (shift register).

That is, the shift register sequentially transmits the counter signal CTR to the control unit 150 in the form of a sequential counter signal SCTR according to the counter output start signal INT / Load.

Here, the SR clock SR_CLK may be supplied from the control unit 150.

As described above, in the position detection system according to the second embodiment of the present invention, the digital circuit for calculating the arrival time difference between the infrared rays and the ultrasonic waves is formed in each of the plurality of reception units 140, thereby reducing the calculation amount of the control unit 150 It is possible to quickly and accurately detect the coordinate and position changes of the interface means 130, and as a result, it is possible to easily recognize the various gestures of the user and the corresponding commands.

On the other hand, the digital circuits of Figs. 5A to 5C, 6A to 6C, 7A and 7B may be applied to the components of the control unit 50 of the first embodiment.

The present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the spirit of the present invention.

10, 110: Position detecting system 20, 120: Display device
30, 130: interface means 40, 140:
50, 150:

Claims (11)

A display device for displaying an image;
Interface means for receiving an instruction and transmitting infrared and ultrasonic waves to the display device;
A plurality of receivers disposed in the display device and receiving the infrared rays and the ultrasonic waves;
A control unit connected to the plurality of receiving units and calculating position information of the interface means using the infrared and arrival time differences of the ultrasonic waves,
Lt; / RTI >
Wherein,
A source signal generator for receiving an analog infrared signal and an analog ultrasonic signal from the plurality of receivers and generating a digital infrared signal, a digital ultrasound signal, a clear signal, and a delay signal;
A timer unit for generating a counter start signal, a counter end signal, and a counter output start signal using the digital ultrasound signal, the clear signal, and the delay signal;
A counter unit for generating a counter signal by using the counter start signal, the counter end signal, and the counter output start signal;
Calculating an arrival time difference in each of the plurality of receiving units using the sequential counter signal and calculating three-dimensional coordinates of the interface unit using the arrival time difference,
.
The method according to claim 1,
Wherein the control unit calculates the three-dimensional coordinates of the interface means and the three-dimensional coordinates from the arrival time difference and the coordinates of the plurality of receiving units using a triangulation method.
delete The method according to claim 1,
Wherein the source signal generator comprises: a digital signal generator for generating the digital infrared signal and the digital ultrasound signal using the analog infrared signal and the analog ultrasound signal; and a controller for generating the clear signal using the digital infrared signal and the M clock And a delay signal generator for generating the delay signal using the digital ultrasound signal and the M clock,
Wherein the timer unit comprises: a start signal generator for generating the counter start signal using the clear signal and the delay signal; an end signal generator for generating the counter end signal using the digital ultrasound signal and the clear signal; And an output start signal generator for generating the counter output start signal using the clear signal and the delay signal,
Wherein the counter unit comprises: a counting unit for generating a counter signal using the counter start signal, the counter end signal, and the M clock; and a control unit for generating the sequential counter signal using the counter signal, the counter output start signal, And an output unit for outputting the position information.
A display device for displaying an image;
Interface means for receiving an instruction and transmitting infrared and ultrasonic waves to the display device;
A plurality of receivers disposed in the display device and receiving the infrared rays and the ultrasonic waves;
A control unit connected to the plurality of receiving units and calculating position information of the interface means using the infrared and arrival time differences of the ultrasonic waves,
Lt; / RTI >
Each of the plurality of receiving units includes:
An analog signal generation unit receiving the infrared rays and the ultrasonic waves from the interface means and generating an analog infrared signal and an analog ultrasonic signal;
A source signal generator for receiving the analog infrared signal and the analog ultrasound signal from the analog signal generator and generating a digital infrared signal, a digital ultrasound signal, a clear signal, and a delay signal;
A timer unit for generating a counter start signal, a counter end signal, and a counter output start signal using the digital ultrasound signal, the clear signal, and the delay signal;
A counter unit for generating a counter signal by using the counter start signal, the counter end signal,
.
6. The method of claim 5,
Wherein the source signal generator comprises: a digital signal generator for generating the digital infrared signal and the digital ultrasound signal using the analog infrared signal and the analog ultrasound signal; and a controller for generating the clear signal using the digital infrared signal and the M clock And a delay signal generator for generating the delay signal using the digital ultrasound signal and the M clock,
Wherein the timer unit comprises: a start signal generator for generating the counter start signal using the clear signal and the delay signal; an end signal generator for generating the counter end signal using the digital ultrasound signal and the clear signal; And an output start signal generator for generating the counter output start signal using the clear signal and the delay signal,
Wherein the counter unit comprises: a counting unit for generating a counter signal using the counter start signal, the counter end signal, and the M clock; and a control unit for generating the sequential counter signal using the counter signal, the counter output start signal, And an output unit for outputting the position information.
The method according to claim 6,
The digital signal generation unit may include a first inverter receiving the analog infrared signal and outputting the digital infrared signal and a second and a third inverter connected in series to receive the analog ultrasonic signal and output the digital ultrasonic signal, ,
The clear signal generator includes a first flip-flop for receiving the digital infrared signal and the M clock and outputting a delayed digital infrared signal and an inverted delay digital infrared signal delayed by one M clock, And a NAND gate receiving the digital infrared signal and outputting the clear signal,
The delay signal generator includes a second flip-flop that receives the digital ultrasound signal and the M clock and outputs a delayed digital ultrasound signal delayed by one M clock, and a second flip-flop that receives the delayed digital ultrasound signal and the M clock And a second flip-flop for outputting the delay signal delayed by two M clocks.
The method according to claim 6,
Wherein the start signal generator includes a first flip-flop that receives the power supply voltage signal and the delay signal and outputs the counter start signal,
Wherein the end signal generator includes a second flip-flop that receives the power supply voltage signal and the digital ultrasound signal and outputs the counter end signal,
And the output start signal generating unit includes a third flip-flop that receives the power supply voltage signal and the delay signal and outputs the output start signal.
The method according to claim 6,
Wherein the counting unit includes a binary counter that receives the counter start signal, the counter end signal, and the M clock and outputs the counter signal,
Wherein the output unit includes a shift register that receives the counter signal, the counter output start signal, and the SR clock and outputs the sequential counter signal.
The interface means receiving the command and transmitting infrared and ultrasonic waves;
A plurality of receiving units arranged on the display device receive the infrared rays and the ultrasonic waves;
Wherein the control unit connected to the plurality of receiving units calculates the position information of the interface unit using the infrared and ultrasound arrival time differences
Lt; / RTI >
Wherein the step of calculating the position information comprises:
A source signal generator of the controller receives an analog infrared signal and an analog ultrasound signal from the plurality of receivers and generates a digital infrared signal, a digital ultrasound signal, a clear signal, and a delay signal;
Generating a counter start signal, a counter end signal, and a counter output start signal by using the digital ultrasound signal, the clear signal, and the delay signal;
Generating a progressive counter signal by using the counter start signal, the counter end signal, and the counter output start signal;
The calculating unit of the control unit calculates the arrival time difference in each of the plurality of receiving units using the serial counter signal and calculating the three-dimensional coordinates of the interface unit using the arrival time difference .
The interface means receiving the command and transmitting infrared and ultrasonic waves;
A plurality of receiving units arranged on the display device receive the infrared rays and the ultrasonic waves;
Wherein the control unit connected to the plurality of receiving units calculates the position information of the interface unit using the infrared and ultrasound arrival time differences
Lt; / RTI >
Wherein the receiving of the infrared rays and the ultrasonic waves by the plurality of receiving units comprises:
An analog signal generating unit of each of the plurality of receiving units, receiving the infrared rays and the ultrasonic waves from the interface unit to generate an analog infrared signal and an analog ultrasonic signal;
A source signal generating unit of each of the plurality of receiving units receives the analog infrared signal and the analog ultrasound signal from the analog signal generating unit to generate a digital infrared signal, a digital ultrasound signal, a clear signal, and a delay signal;
Generating a counter start signal, a counter end signal, and a counter output start signal using the digital ultrasound signal, the clear signal, and the delay signal;
And generating a counter signal by using the counter start signal, the counter end signal, and the counter output start signal.

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