KR100545534B1 - Interactive electronic system by using ultrasonic phase difference and doppler shift - Google Patents

Abstract

The present invention relates to an interactive electronic system using an ultrasonic phase difference and a Doppler shift. In particular, the system of the present invention starts to send a continuous ultrasonic wave when the host device is activated by a directional IR signal of an indicator device. On reaching, turns off the IR beacon signal. Accordingly, the indicating device transmits the phase difference of the received ultrasonic signal, the forward and backward movement of the indicating device, and the state of the button to the host device through the non-directional IR transmitter in the form of an IR data packet, and the host device adjusts the GUI cursor accordingly. When the host device detects a discontinuity in the ultrasonic phase difference to the indicator, the host device returns to an inactive state and stops ultrasonic transmission.

Interactive Television, Ultrasonic Phase Difference, Doppler Shift

Description

INTERACTIVE ELECTRONIC SYSTEM BY USING ULTRASONIC PHASE DIFFERENCE AND DOPPLER SHIFT}

1 is a schematic configuration diagram of an interactive electronic system using ultrasonic phase difference and Doppler shift according to the present invention;

2 is a schematic structural diagram of a host apparatus in a system according to the present invention;

3 is a schematic structural diagram of an indicator in a system according to the present invention;

4 is a configuration diagram of a phase difference detection unit of the indicating device shown in FIG. 3;

5 is a configuration diagram of a Doppler shift detector of the indicating device shown in FIG. 3;

6 is a view showing the relationship between the phase difference of the ultrasonic signal and the sensor in the present invention,

FIG. 7 is a view illustrating an activation boundary determined by a reception area of an IR signal and an inactivation boundary determined by a discontinuity point of an ultrasonic phase difference signal in order to explain active / inactive state control of a host device of the present invention; FIG.

8 is a state transition diagram for explaining the active / inactive state control of the host device of the present invention,

9 illustrates a GUI on a display of an interactive electronic system used in an embodiment of the invention.

<Description of the code | symbol about the principal part of drawing>

10 host device 11 ultrasonic transmitter

12: IR receiver 13: indication status determination unit

14: packet processing unit 15: signal processing unit

16: TV GUI 20: indicating device

21: ultrasonic receiver 22: directional IR transmitter

23 non-directional IR transmitter 24 phase difference detector

25 Doppler shift detection unit 26 Control unit

27: input unit (button)

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interactive electronic system operated by a remote indicating device, and in particular, an ultrasonic phase difference and a doppler which can easily remotely control menu and system driving by manipulating a graphical user interface (GUI) cursor of a television display using an ultrasonic sensor. The present invention relates to an interactive electronic system using shift.

In the case of the conventional analog type electronic system, only a simple input operation such as a button, a dial, a remote controller, etc. was required to operate the system, whereas in the case of the interactive type electronic system, which is to be universalized in the future, the host device and the indicating device are connected by bidirectional communication New input methods are required to enable remote control and high functionality of the device. However, in the case of a television which is well known as an interactive electronic system, various remote indicating devices have only been introduced without standardization of input device input mechanisms.

For example, there is a method of using an input device for a computer such as a trackball, a joystick, a gyroscope, etc. in a remote controller as an indication device of an interactive television. However, unlike a computer, a television is far from the indication device. It is difficult to remotely control by pointing. Therefore, there is a demand for a pointing device for a new interactive electronic system.

Ultrasonic sensors have long been used to locate and measure objects. There are two types of methods using ultrasonic sensors.

The first pulse-echo method is to obtain the distance from the object by measuring the time from the transmission to the reception by receiving the wave reflected by the ultrasonic wave from the ultrasonic sensor.

In the second phase difference method, an ultrasonic sensor sends an ultrasonic wave to receive a wave reflected by a target object by a sensor and calculates a distance to the object using a phase difference between a transmitting wave and a receiving wave. This retardation distance measurement is more accurate than the pulse echo method and has the advantage of being noise resistant.

An example of the indicating device using the phase difference of the ultrasonic signal is a cursor control device disclosed in US Pat. No. 5,999,167. This is a device that controls the cursor in a three-dimensional space. It uses an ultrasonic sensor and an infrared signal (IR) to remotely control the cursor on the television display. A device using an infrared signal to send a command to a television.

However, the biggest problem in the method of determining the position of the pointing device by using the difference in phase difference between the received signals of the two ultrasonic sensors is that the phase difference between the ultrasonic sensors increases according to the degree of inclination of the pointing device, and the phase difference is higher than one wavelength (2π). Is the problem that eventually becomes equal, namely phase ambiguity.

In addition, in the case of the indicator device to operate on the surface unlike the mouse to operate on the surface like a mouse, the finger that can press the button is limited to the thumb, in this case it is not preferable to have two buttons like the mouse.

An object of the present invention is to remotely control the host device by detecting the position by detecting the phase difference of the indicator using the ultrasonic sensor array in the indicator to solve the above phase difference ambiguity, the IR signal and the detected phase difference Accordingly, the present invention provides an interactive electronic system capable of overcoming a phase difference ambiguity of an ultrasonic sensor by activating or deactivating a remote control.

Another object of the present invention is to measure the Doppler shift of the ultrasonic signal in order to solve the problem of two buttons of the mouse as the pointing device and to indicate the right mouse button, which is the front and rear movement information of the pointing device, from the value and the button input of the pointing device. It is to provide an interactive electronic system with a remote indicator that indicates the left mouse button by value.

In order to achieve the above object, the present invention provides an interactive electronic system having a host device and an indicator device for bidirectional communication, wherein the host device includes an IR receiver configured to receive an IR beacon signal of the indicator device, and an ultrasonic signal in response to the IR beacon signal. The cursor on the display is remotely controlled according to the continuity / discontinuity of the ultrasonic wave transmitting part, the ultrasonic wave receiving signal from the indicating device in response to the ultrasonic signal, and the ultrasonic wave phase difference. An instruction state determination unit that determines whether the active state is inactive or not, and a signal processor that converts the ultrasonic phase difference of the packet processing unit into GUI cursor coordinates on the display when the instruction state determination unit is active. The indicating device of the present invention includes an IR transmitter for transmitting an IR beacon signal and an IR data packet to a host device, an ultrasound receiver for receiving an ultrasound signal transmitted from the host device, and a phase difference between the X and Y axes from the ultrasound signal. And a control unit which controls to transmit the ultrasonic phase difference of the phase difference detection unit to the indicating device as an IR data packet. The host apparatus of the present invention detects button state change or forward and backward motion information of the indicating apparatus from the IR data packet through the packet processing section, and remotely controls the GUI cursor on the display according to the detected signal.

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

1 is a schematic configuration diagram of an interactive electronic system using ultrasonic phase difference and Doppler shift according to the present invention. Referring to Fig. 1, the system of the present invention is largely composed of a remote control target host device 10 and its indicating device 20. In the embodiment of the present invention, the host device 10 is limited to an interactive television. The host device 10 may be compatible with an electronic device having a bidirectional communication interface with the indicating device 20, such as a refrigerator, a DVD player, an air conditioner, and the like.

When the host device 10 of the present invention receives an IR beacon signal through the directional IR transmitter 22 of the indicating device 20, the host device 10 transmits an ultrasonic signal (for example, 40 kHz) to a remote location through the ultrasonic transmitter 11. (20). The indicating device 20 includes three ultrasonic sensors 21a, 21b, and 21c, which are ultrasonic receivers, and includes an X-axis horizontal arrangement (left / right) or a Y-axis of the three ultrasonic sensors 21a, 21b, and 21c. Using the signals Vh, Vc, and Vv measured through the vertical arrangement (up / down), the slope of the indicating device 20 with respect to the host device 10 is obtained, and the Doppler shift of the ultrasonic signal Vc is measured. From this, the forward and backward movement of the indicating device 20 is detected. The indicating device 20 converts the X and Y phase differences, the front and rear motion information, and the state change of the button into IR data packets, and transmits them to the host device 10 through the non-directional IR transmitter 23. The host device 10 receives the IR data packet through the IR receiver 12, converts the X and Y phase difference of the IR packet into X and Y coordinates, and changes the coordinate position and button state change and the forward and backward motion information of the indicating device. To operate the corresponding GUI cursor on the display.

2 is a schematic configuration diagram of a host apparatus in a system according to the present invention. The host apparatus 10 of the present invention includes an ultrasonic transmitter 11, an IR receiver 12, an indication state determination unit 13, and a packet. It is comprised of the processing part 14, the signal processing part 15, and the TV GUI 16. FIG.

)를 변환, 필터링하여 X 및 Y 좌표(X, Y)로 만들어 TV GUI(16)로 보내어 GUI 커서의 위치를 조정한다.The ultrasonic transmitter 11 generates an ultrasonic signal and transmits the ultrasonic signal to the pointing device 10. The IR receiver 12 receives an IR beacon signal from the indicator and transmits the signal to the instruction state determiner 13 and the packet processor 14. The indication state determining unit 13 determines whether the remote control of the indicating device is active or not, from the IR beacon signal presence / absence information from the IR receiver 12 and the ultrasonic phase difference information from the packet processing unit 14. To transmit a signal for turning on / off the ultrasonic transmitter 11. At the same time, the instruction state determination unit 13 sends a message to the TV GUI 16 to show or hide the panel for remote control. The TV GUI 16 is an input interface in which a graphic menu, an icon, and the like for a program operation of a host device are displayed, as is commonly known, and a cursor for pointing and clicking them. The packet processor 14 reads the button input information from the IR data packet and sends information to the TV GUI 16 as to whether the input button of the indicating device is pressed or not. The packet processor 14 reads the Doppler shift information of the ultrasonic signal from the IR data packet and sends the forward and backward motion (forward / backward) information of the indicating device to the TV GUI 16. The signal processor 15 may be configured as an ultrasonic phase difference from the packet processor 14 (

) Are transformed and filtered to X and Y coordinates (X, Y) and sent to the TV GUI 16 to adjust the position of the GUI cursor.

3 is a schematic configuration diagram of an indicator in the system according to the present invention, in which the indicator 20 of the present invention includes an ultrasonic receiver 21, a directional IR transmitter 22, a non-directional IR transmitter 23, The phase difference detection part 24, the Doppler shift detection part 25, the control part 26, and the input part 27 are comprised.

)를 검출한다. 도플러 쉬프트 검출부(25)는 수신된 초음파 신호들중에서 어느 하나(Vc)에서 초음파 신호의 도플러 쉬프트(Vd)를 검출한다. 그리고 제어부(26)는 지시장치의 입력부(27)인 버튼 상태의 변화(눌림/안눌림)를 감지하고, 도플러 쉬프트(Vd)가 일정치 이상/이하임으로부터 지시장치의 전후 움직임을 감지하여 초음파 위상차 정보와, 버튼 상태 정보와, 전후 움직임 정보를 IR 데이터 패킷으로 만들어 비지향성 IR 송신부(23)로 전달한다. 또한 제어부(26)는 일정한 시간간격으로 지향성 IR 송신부(22)를 통해 IR 비콘 신호를 송신하도록 제어한다. 여기서 IR 비콘 신호는 호스트장치내의 지시장치 판단부로 전달되어 원격 제어의 비활성화 상태를 활성상태로 전이시키는 역할을 한다. 이에 대한 상세한 설명은 도 7과 도 8을 참조하여 후술하기로 한다.The ultrasonic receiver 21 receives ultrasonic signals Vh, Vc, and Vv respectively measured through the X-axis horizontal arrangement or the Y-axis vertical arrangement of the three ultrasonic sensors 21a, 21b, and 21c shown in FIG. 1. And transmits it to the phase difference detection unit 24. The phase difference detection unit 24 performs phase difference with respect to the X-axis and the Y-axis from the received ultrasonic signals Vh, Vc, and Vv.

). The Doppler shift detection unit 25 detects the Doppler shift Vd of the ultrasound signal in any one of the received ultrasound signals Vc. The control unit 26 detects a change in the state of the button (pressing / not pressing), which is the input unit 27 of the pointing device, and detects the front and rear movement of the pointing device from the Doppler shift Vd above a certain value or below. The phase difference information, the button state information, and the forward and backward motion information are converted into IR data packets and transmitted to the non-directional IR transmitter 23. In addition, the control unit 26 controls to transmit the IR beacon signal through the directional IR transmitter 22 at regular time intervals. The IR beacon signal is transmitted to the indicator determining unit in the host device to transfer the inactive state of the remote control to the active state. Detailed description thereof will be described later with reference to FIGS. 7 and 8.

)는 다음 수학식과 같다.2 and 3, the phase difference of the X-axis detected by the phase difference detector 24 of the indicating device 20 (

) Is as shown in the following equation.

)는 다음과 같다. And the phase difference of the Y axis (

) Is as follows.

)는 3개 초음파 센서들의 X축, Y축으로 기울어진 각도인 θ_X, θ_Y에 각각 비례하고 또한 초음파 센서간의 거리 d에 비례함을 알 수 있다.In Equations 1 and 2, d is the distance between the ultrasonic sensors and λ is the wavelength of the ultrasonic sensor. In Equations 1 and 2 above, the X and Y phase differences (

) Is proportional to θ _X and θ _Y , which are angles inclined to the X and Y axes of the three ultrasonic sensors, and also proportional to the distance d between the ultrasonic sensors.

)는 호스트장치의 신호 처리부(15)에서 변환, 노이즈 필터링 등의 과정을 거쳐 X 및 Y 좌표(X, Y)로 구해지는데 그 값은 다음과 같다.These X and Y phase differences (

) Is obtained by X and Y coordinates (X, Y) through a process such as conversion and noise filtering in the signal processing unit 15 of the host device.

Where α is the gain factor.

Referring to Equation 3, the GUI cursor position on the display of the host device is moved in the X and Y axis directions according to the X and Y axis tilt angles θ _X and θ _Y of the indicating device with respect to the host device. That is, the X and Y axis movement distance and direction of the cursor change according to the inclination angles θ _X and θ _Y of the pointing device.

)을 감산하여 X 또는 Y 위상차 신호인 전압(Vx, Vy)으로 출력하는 한 쌍의 감산부(244)(245)와, 감산부(244)(245)에서 출력된 신호(Vx, Vy)의 노이즈를 제거하는 한 쌍의 필터(246)(247)로 구성된다. 이때 플립플롭(242,243)은 RS 플립플롭, 필터(246, 247)는 저역통과필터가 사용될 수 있으나 이 위상차 검출부의 회로 구성은 당업자에 의해 변경이 가능하다.FIG. 4 is a configuration diagram illustrating a phase difference detector of the indicating device shown in FIG. 3. Referring to FIG. 4, the phase difference detecting unit 24 receives signals input from two ultrasonic sensors 21a, 21b, 21b and 21c, respectively, among the three ultrasonic sensors 21a, 21b and 21c illustrated in FIG. 1. A pair of flip-flops 242 and 243 for calculating Vh and Vc (Vc and Vv) and the outputs Q and V of the flip-flops 242 and 243.

) And a pair of subtractors 244 and 245 for outputting the voltages Vx and Vy as X or Y phase difference signals, and the signals Vx and Vy output from the subtractors 244 and 245. It consists of a pair of filters 246 and 247 for removing noise. In this case, the flip-flops 242 and 243 may be RS flip-flops, and the filters 246 and 247 may be low pass filters. However, the circuit configuration of the phase difference detector may be changed by those skilled in the art.

)가 0일 때 0, π일 때 최대값, -π 일 때 최소값을 갖는다. 그 외의 범위에서는 도 7의 그래프에 도시된 바와 같은 주기적인 특성을 갖는다.The outputs Vx and Vy of the phase difference detector 24 of the present invention are X and Y phase differences ( or

) Is 0, 0, π maximum, -π minimum value. Other ranges have periodic characteristics as shown in the graph of FIG. 7.

)를 감산하는 감산부(253)와, 감산부(253)의 신호를 필터링하는 저역통과 필터(254)를 포함한다. FIG. 5 is a configuration diagram of a Doppler shift detection unit of the indicating device shown in FIG. 3 and is a circuit used for normal Doppler shift detection. Referring to FIG. 5, the Doppler shift detection unit 25 includes a voltage control oscillator (VCO) 255 for generating a reference signal (square wave), and an RS flip for calculating an ultrasonic signal Vc and a reference signal. The flop 252 and the output signal Q of the RS flip-flop 252;

Subtraction unit 253 for subtracting the subtracting unit 253, and a low pass filter 254 for filtering the signal of the subtracting unit 253.

The Doppler shift detection unit 25 uses the ultrasonic signal Vc transmitted from the ultrasonic sensor 21b. The Doppler shift detection unit 25 obtains a phase difference signal Vd between the ultrasonic signal Vc and a reference signal (square wave). Is fed back to the voltage controlled oscillator (VCO) 255 to form a phase locked loop (PLL). By the feedback Vd signal, the signal frequency of the voltage controlled oscillator VCO 255 is adjusted to the frequency of the ultrasonic signal Vc. At this time, the feedback phase difference signal Vd becomes a signal proportional to the Doppler shift as it has a value proportional to the deviation of the center frequency fo of the voltage controlled oscillator VCO 255. The Doppler shift signal Vd outputted through the Doppler shift detector 25 is used as forward and backward motion information of the pointing device.

)가 한 파장(2π) 이상이면 X 위상차(

)와 Y 위상차(

)가 같아져 위상차 모호성이 발생하게 된다. 즉 지시장치를 정확히 호스트장치의 디스플레이에 정면 겨냥할 경우 X축 및 Y축 방향의 초음파 센서들간 X 및 Y 위상차신호(Vx, Vy)는 0이 된다. 도 6에서 지시장치를 X축(좌/우)으로 움직일 경우 좌우로 기울어진 각도를 θ라고 할 때 기울어진 각도 θ에 따라서 X축 초음파 센서간의 X 위상차신호(Vx)가 증가하게 된다. 그런데, 위상차가 π를 넘으면 위상차 신호(Vx)는 최대값에서 최소값으로 점프하게 된다. 따라서 지시장치가 정면을 향하고 있을 경우(

)와 2π만큼 점프된 위상차에 해당하는 각도 θ만큼 기울어져 있는 경우를 호스트장치는 구분하지 못하는 위상차 모호성이 있다.On the other hand, when measuring the position of the indicator using the X and Y phase difference measured by the ultrasonic sensors of the indicator,

) Is more than one wavelength (2π), the X phase difference (

) And the Y phase difference (

) Are equal, resulting in phase ambiguity. That is, when the pointing device is exactly aimed directly at the display of the host device, the X and Y phase difference signals Vx and Vy between the ultrasonic sensors in the X and Y axis directions are zero. In FIG. 6, when the indicating device is moved on the X axis (left / right), when the angle tilted left and right is θ, the X phase difference signal Vx between the X axis ultrasonic sensors increases according to the tilt angle θ. However, when the phase difference exceeds π, the phase difference signal Vx jumps from the maximum value to the minimum value. So if the pointing device is facing straight (

) And the phase difference ambiguity which the host apparatus cannot distinguish between the case where the angle is inclined by an angle θ corresponding to the phase difference jumped by 2π.

)가 -π와 π 사이에 있을 경우에만 호스트장치의 원격 제어가 활성화된다.Thus, the interactive electronic system of the present invention allows the host device to have two active and inactive remote control modes as shown in FIG. The phase difference ambiguity is overcome by transitioning to an active state when an IR beacon signal is detected in the host device and transitioning to an inactive state when a sudden change or discontinuity is detected in the received ultrasonic phase difference signals Vx and Vy. That is, the X and Y-axis phase

Remote control of the host device is only active if) is between -π and π.

This control scheme is clearly distinct from the simple approach of limiting the angle of the indicator depending on the directivity of the IR beacon signal. Simply relying on the directivity of the IR is a reliable method considering that the intensity of the IR LED depends not only on the angle, but also on the distance, and because the illuminance distribution by the IR LED is circular and does not match the typical rectangular display area. no.

) 좌표계에서 표현되었다. 도 8의 TV 디스플레이 영역의 하단과 좌단에 나타낸 두 그래프는 각각 위상차

와 그 신호 Vx간의 관계, 위상차

와 그 신호 Vy간의 관계를 보여주고 있다. 디스플레이 영역(b) 밖으로 점선으로 된 비활성화 경계선(a)은 X 및 Y 위상차 신호(Vx, Vy)의 비연속점들에 의해서 결정된다. 호스트장치가 활성화된 상태에서 지시장치가 비활성화 경계선(c)을 넘게 되면 위상차 신호에 점프가 발견되고 호스트장치는 비활성화 상태로 전이된다. 여기서 필요조건으로 활성화 경계선이 비활성화 경계선 안에 들어가야 하며, 이 조건을 만족시키기 위하여 지향성 IR 송신부의 적절한 지향성 선택이 필요하다.Figure 7 is a state transition diagram for explaining the active / inactive state control of the host device of the present invention. Referring to FIG. 8, the activation boundary a shown by a dotted line in the display area b of the host device indicates a range in which the IR receiver of the host device can receive an IR beacon signal from the directional IR transmitter of the indicator. Initially, when the angle of the indicator falls within this area when the host device is inactive, an IR beacon signal is received and the host device transitions to the active state. All boundary lines in FIG. 8 have a phase difference (

) Is expressed in the coordinate system. The two graphs shown at the bottom and left ends of the TV display area of Fig. 8 are respectively phase difference.

And the phase difference between the signal and its signal Vx

Shows the relationship between the signal and Vy. The inactive border line a dotted line out of the display area b is determined by the discontinuous points of the X and Y phase difference signals Vx and Vy. When the indicator device crosses the deactivation boundary c while the host device is activated, a jump is detected in the phase difference signal and the host device is transitioned to the deactivated state. As a requirement, the activation boundary must be within the inactivation boundary, and an appropriate orientation selection of the directional IR transmitter is required to satisfy this condition.

9 illustrates a GUI on a display of an interactive electronic system used in an embodiment of the invention. This GUI is simplified for ease of use testing of the pointing device of the present invention.

The GUI menu on the display is composed of channel knobs, volume knobs, brightness knobs, power on / off, and the like for television operation. The GUI of FIG. 9 is hidden when the host device is inactive. In this state, when the user picks up the pointing device and aims toward the display, the host device transitions to the active state and the GUI of FIG. 9 is shown on the display, and the cursor is positioned at a position proportional to the phase difference in the X and Y directions of the pointing device. Will be located. When the user remotely points the pointer to the desired knob position on the display, the knob is highlighted, and when the user moves the indicator in a circle while holding down a button that is the input of the indicator, as if the knob was turned and turned, the knob rotates. It can control channel change, volume control, brightness control, etc. Alternatively, if the indicator is pushed forward and pulled (forward and backward movement) with the knob highlighted, a Doppler shift in phase difference is detected, and this signal is transmitted to the TV GUI as a forward and backward motion message through the above-described sequence of steps, and the sub associated with the knob Menus, that is, channel menus, sound quality menus, and color menus are displayed.

As described above, the present invention is to remotely control the host device by detecting the position by detecting the phase difference of the pointing device by using the ultrasonic sensor array in the pointing device, and activates the remote control according to the discontinuity of the IR signal and the detected phase. Deactivation overcomes the phase ambiguity, which is a problem of the conventional ultrasonic-based indicator.

In addition, the present invention measures the Doppler shift of the ultrasonic signal in the pointing device to recognize the forward and backward movement gesture of the pointing device from the above or below a certain value to function as a right mouse button. This improves the user's usability by easily operating the menu on the display with only one button, rather than controlling the menu using multiple buttons.

Meanwhile, the present invention is not limited to the above-described embodiments, but various modifications are possible by those skilled in the art within the spirit and scope of the present invention described in the claims below.

Claims (16)

delete In an interactive electronic system having a host device and an indication device for bidirectional communication, The host device may include an IR receiver configured to receive an IR beacon signal of the indicator, an ultrasound transmitter configured to emit an ultrasonic signal in response to the IR beacon signal, and an IR data packet transmitted from the indicator in response to the ultrasonic signal. A packet processor for receiving the ultrasonic phase difference and an instruction state determination unit for determining whether the cursor on the display is an active state or an inactive state in which the cursor on the display is remotely controlled according to the continuity / discontinuity of the ultrasonic phase difference of the packet processor; A signal processing unit converting the ultrasonic phase difference of the packet processing unit into GUI cursor coordinates on the display when the determination unit is active; The indicating device includes an IR transmitter for transmitting an IR beacon signal and an IR data packet to the host device, an ultrasonic receiver for receiving ultrasonic signals transmitted from the host device by three ultrasonic sensors, an X-axis and A phase difference detection unit for detecting a phase difference with respect to a Y axis, and a control unit for controlling the ultrasonic phase difference of the phase difference detection unit to be transmitted to the indicating device as the IR data packet; The host apparatus detects a button state change or forward and backward motion information of the indicating device from the IR data packet through the packet processor and remotely controls a GUI cursor on the display according to the detected signal. Interactive electronic system using shift. The method of claim 2, The indication state determination unit of the host device determines that the IR beacon signal is received and is in an active state or an inactive state according to whether an ultrasonic phase difference of the IR data packet is found between π and -π. Interactive electronic system using ultrasonic phase difference and Doppler shift. The method of claim 2, And the host device stops the ultrasonic transmitter when the indication state determination unit is in an inactive state. The method of claim 2, And the host device makes the GUI on the display invisible when the indication state determining unit is in an inactive state. The method of claim 2, And said IR transmitter of said indicating device comprises a directional IR transmitter for transmitting said IR beacon signal and a non-directional IR transmitter for transmitting said IR data packet. The method according to claim 2 or 6, The controller of the indicating device stops the transmission of the IR beacon signal through the directional IR transmitter and receives the ultrasonic signal through the ultrasonic receiver, and controls to transmit the IR data packet through the non-directional IR transmitter. Interactive electronic system using phase difference and Doppler shift. delete The method of claim 2, The ultrasonic sensors are interactive electronic systems using ultrasonic phase difference and Doppler shift, characterized in that a pair of sensors are arranged horizontally with each other and a pair of sensors are vertically arranged. The method of claim 2, And an ultrasonic phase difference and a Doppler shift. The method of claim 2, The phase difference detector of the indicating device includes a flip-flop for calculating signals input from two ultrasonic sensors, a subtractor for subtracting the flip-flop signal and outputting the signal as an X or Y phase difference signal, and a signal output from the subtractor. Interactive electronic system using ultrasonic phase difference and Doppler shift, characterized in that each pair of filters to remove the noise of the. The method of claim 2, And the indicating device further comprises a Doppler shift detector for detecting a Doppler shift of the ultrasonic signal received by the ultrasonic receiver. The method of claim 12, And the control unit of the indicator device includes the Doppler shift signal of the Doppler shift detector as forward and backward motion information of the indicator device to be included in the IR data packet. The method of claim 12, The Doppler shift detector includes a voltage controlled oscillator for generating a reference signal, a flip-flop for calculating an ultrasonic signal and the reference signal, a subtractor for subtracting the flip-flop signal, and a filter for filtering the signal of the subtractor. And obtain a phase difference between the ultrasonic signal and the reference signal, and the phase difference signal is fed back to the voltage controlled oscillator to generate a Doppler shift signal. The method of claim 2, And the indicating device further comprises an input unit having a button. The method of claim 15, And the control unit of the indicating device includes the button information of the input unit in the IR data packet.

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