JPH0271698A - Remote command input device - Google Patents

Abstract

PURPOSE:To decide a command position coordinate with simple constitution and high accuracy by receiving a sound from three sounding bodies arranged to a remote support rod in a prescribed way by 3 reception means and calculating the coordinate on a video display device corresponding to the combination of sound wave propagation times. CONSTITUTION:A switch 6 of a remote indication rod 1 is controlled by a microprocessor unit 19 and an impulse signal from an impulse oscillator 7 is supplied to a sounding body 2 or the like in 3 sounding bodies 2-4 not arranged in aline, the sounding body 2 is sounded and the sound wave is received by reception elements 8-10 not arranged in a line. Then the sound wave propagation time is calculated by clock devices 15-17. This is similar to the sounding bodies 3,4 and the unit 19 calculates the coordinate on a video display device 11 from the combination of 9 calculation times by the devices 15-17. Through the constitution above, the display coordinate indicated remotely is decided with high accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a remote instruction input device for inputting the coordinate position of a point on a video display device by specifying the point from a distance.

[Conventional technology]

Conventionally, coordinate input devices for video screens that enlarge and project CRT screens, etc., have been constructed using magnets and magnetic sensors, or optical lenses as disclosed in Jikai No. 58-163039. An image of the screen is focused on the pointing device, and a light sensor is placed at a point on the image to receive light.The coordinates on the video screen are determined from the phase difference between the video output synchronization signal and the raster signal of the light sensor. There are some that can detect the position.

(Problems to be solved by the invention) In these conventional technologies, examples using magnetic sensors require bulky devices and problems with detection accuracy.Also, examples using optical lenses However, when the remote control stick moved back and forth, it was difficult to focus at the indicated position, and the sensitivity of the sensor was also poor, limiting the display image.

SUMMARY OF THE INVENTION An object of the present invention is to provide a remote instruction input device which solves the above problems, has high detection accuracy using a simple method, and is capable of inputting information to any video display device.

[Means to solve the problem]

The present invention includes three sound wave receiving means arranged so as not to be lined up in a straight line around the image display device, and three sound wave receiving means arranged not to be lined up in a straight line at the tip of the remote indicator stick. a sound generation means; and a time measurement means serving as a signal processing unit for measuring respective times (9 times in total) from the time when a sound wave is emitted from the three sound generation means until the sound wave is detected by the three sound wave reception means; This problem can be solved by providing a calculation means for calculating the indicated position on the video display device from the obtained time, and further having a trigger manual means such as a switch pressed by the user on the remote pointing stick.

[Effect]

The sound waves generated in a time-division manner from the three sounding means placed at the tip of the remote control stick are received by the three receiving means provided around the video display device, and the arrival time (propagation time) of the sound waves is
is measured by a timing means.

Next, the positions of the three sounding bodies of the remote pointing stick are calculated from the propagation time obtained by the calculation means, and the coordinate position of the point on the video display device that the remote pointing stick is pointing to is calculated. Further, when the user determines that the desired coordinate position has been given, the user notifies the host computer using the trigger force means. Thereby, the coordinates of the designated position can be input with high precision to any video display device.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

First, FIG. 1 is a schematic configuration diagram showing the entirety of the present invention. 1 is a remote indicator stick, 2, 3.4 are sounding bodies arranged at the tip of the remote indicator stick 1 so as not to line up on the same straight line, 6 is a sounding body switching switch, 7 is an oscillator, 8, 9.10 are Receiving elements arranged so as not to be aligned on the same straight line, 11
is a video display device, 12.13.14 is a waveform shaper, 1
5, 16. 17 is a clock device, 18 is an oscillator that supplies a clock for the clock device, and 19 is an MPU.

First, the lMPU 19 first selects the sounding body changeover switch 6.
Selects the sounding body 2 and instructs the first oscillator 7 to input an impulse signal to the sounding body 2. The sounding body 2 receives this signal and generates an impulse sound in the space. At the same time, the clock devices 15, 16, and 17 are reset by the impulse signal. The clock devices 15, 16, and 17 are composed of counters, and count up at a constant speed in response to a signal from an oscillator 18 having a constant cycle. On the other hand, the sound emitted from the sounding body 2 propagates through space and is transmitted to three receiving elements 8, 9.1.
0, where it is converted into an electrical signal. Thereafter, they are converted into pulse signals by waveform shapers 12, 13, and 14, respectively. The pulse signals stop the operations of the three timers [15, 16, and 17] that were counting up. Thereby, from the sounding body 2 to the receiving elements 8, 9.1.
The spatial propagation time up to 0 can be measured. After that, the MPU 19 uses these three clock devices 15°, 16.
Read the value of 17. Next, the MPU 19 instructs the oscillator 7 and the sounding element changeover switch 6 to cause the sounding element 3 to generate an impulse sound. After that, as before, the propagation time until entering the three receiving elements 8 and 9.10 was calculated using the respective clock devices 15° and 16.17, and the total was 81, which was the same < M
PU19 takes in the value.

After that, the spatial propagation time using the sounding body 4 is measured and input into the MPU 19.

With the above, three sounding bodies 2, 3.4 and three receiving elements 8, 9
．． This means that a total of 9 propagation times, which are the individual spatial propagation times between 10 and 10, could be measured. By the way, the propagation speed of sound waves is almost constant, so from the propagation time, the three sounding bodies 2, 3
．． 4 and the three receiving elements 8, 9, and 10 can be calculated.

Next, the target coordinates are calculated by calculations within the MPU 19. To explain this calculation method, first consider a view of the entire system from directly above as shown in FIG. When facing the video display device 11, the X-axis corresponds to a so-called horizontal direction, and the Z-axis corresponds to a so-called front-back direction. In this case, the value desired to be obtained by the instruction input device is the X coordinate value of the point on the video display device 11 that the remote instruction stick 1 is pointing to. In this case, the purpose can be achieved by a method using two sounding bodies 2.3 and two receiving elements 9 and 10. In Fig. 2, one sounding body 2 is at a distance L2 from the receiving element 9, and a distance L2 from the receiving element 1°.
This is the position of Therefore, in the two-dimensional coordinate system shown in FIG. 2, the position of the sounding body 2 is limited to one point. Similarly, the position of the sounding body 3 is also distanced from the receiving elements 9 and 10, respectively.
Because it is far away and far away, it is limited to - points. Next, in FIG. 3, when the coordinate positions (point D, point E) of the two sounding bodies 9 and 10 are limited, the two sounding bodies 9°10
The point (point P) where the perpendicular bisector of the line connecting the lines intersects with the line segment AB indicating the video display device 11 is the point on the video display device 11 that the remote pointing stick 1 is pointing to. The X coordinate value of this point P is the desired value. The midpoint between points D and E is point M, and D
A straight line passing through the point and parallel to line segment AB, and a line passing through point E and line segment AB
Let the point where the straight line perpendicular to intersects be point F. Also, the foot placed perpendicularly to line segment A from point M is set as 0 point. Here, considering triangle MCP and triangle DEF, their corresponding angles are equal, so they have the condition of similarity. Therefore, the ratio of corresponding sides is equal to the similarity ratio, and from this, the value of X can be calculated.

Now, the coordinates of point D are (X□, Z□), and the coordinates of point E are (X
2 t 22 ), the coordinates of point F are (x2.z,
). Also, since point M is the midpoint between points D and E, its coordinates are ((xt + X2) /2.
) /2). Therefore, the coordinates of the 0 point are ((X□
+X2)/2.0).

PC with triangle MCP and triangle DEF: E F=CM : FD ,', P C= E F X CM / F D=(
zx-z2)×(zt+zz)/(2×(xx-xz)
) Therefore, if the X coordinate value of point P is xp, then 2
The X coordinate of point P can be determined only from the coordinate values of the sounding bodies.

As described above, the two sounding bodies 2, 3 and the two receiving elements 9,
10, it is possible to calculate the X coordinate value of point P on the video display device 11 pointed by the remote control stick 1 on the xz plane.

Similarly, in the yz plane, that is, the coordinate system viewed from the side, the X coordinate value of the point on the video display device 11 pointed by the remote control stick 1 is determined by the same method as described above. Therefore, three sounding bodies 2°3.4 are provided on the remote control stick 1 so that they are not lined up in a straight line in three-dimensional space, and three sounding bodies 2°3.4 are installed around the video display device 11 so that they are not lined up in a straight line. By providing the receiving elements 8, 9, and 10, the X coordinate value and the X coordinate value of the point on the video display device 11 pointed by the remote pointing stick 1 can be determined.

In addition, three sounding bodies 2, 3.4 and three receiving elements 8
, 9.10, it is theoretically possible to calculate if the sounding bodies 2 and 10 are not placed on the - straight line, but the arrangement that allows accurate detection is to place the sounding bodies 2 and 2 at the apexes of the equilateral triangle, respectively. 3.4 or receiving elements 8, 9, and 10 are arranged.

Furthermore, the types of sound waves used are not limited to impulse sounds, but may also include ultrasonic waves and, in some cases, sounds in the audible range. However, it is necessary to take measures to suppress the influence of surrounding noise by using filters, etc.

Furthermore, the trigger button 5 can be used in the following ways. The obtained coordinate values are provided to the host computer as the output of the remote instruction input device. In response to this value, the host computer displays a cursor on the video display to indicate which point the user of the remote input device is pointing to. When the user confirms that the cursor has been moved to the desired position, the user presses the trigger button to inform the host computer of the coordinate position at that time, thereby informing the user of the coordinate values intended by the user.

Next, an example of making the pointing stick completely cordless by using an infrared transmitting and receiving device according to the present invention will be shown. In FIG. 4, 20 is an infrared light emitting element which receives a signal from an infrared transmitter 21 and generates infrared light.

22 is a timing generator. 23 is an infrared light receiving element, which converts the received infrared light into an electrical signal. 24 is an infrared receiver, which detects information from the received signal. Now, a control signal is given from the timing generator 22 to the sounding element changeover switch 6, the oscillator 7, and the infrared transmitter 21, causing the infrared light emitting element 20 to generate infrared rays almost simultaneously when a sound wave is emitted from the sounding element 2 or 3.4. .

The propagation speed of infrared rays is much faster than the speed of sound, so it can be ignored compared to the propagation time of sound waves. Therefore, the signal output from the infrared receiver 24 is used as a reset signal for the timekeeping devices 15-17. Furthermore, even if the trigger button 5 is pressed, the infrared transmitter 21 receives it and drives the infrared light emitting element 20 with a different signal format from the previous one, and sends the signal to the MPU 19 via the infrared light receiving element 22 and the infrared receiver 23. Notify.

As a result, the remote instruction stick 1 becomes a completely cordless remote instruction input device.

According to this embodiment, it is possible to realize a remote instruction input device with a simple configuration that allows the user to input coordinates by operating a remote instruction stick from any position. Additionally, by using an infrared transmitting and receiving device, the remote control stick becomes completely cordless.

〔Effect of the invention〕

According to the present invention, it is possible to realize a remote instruction input device that can input coordinates with high accuracy from any position with a simple configuration. Furthermore, in the remote instruction input device using the present invention, a large screen C
It can be used as a coordinate input device for large-sized video display devices such as RT and video projectors, or for video display devices using any type of system.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing one embodiment of the present invention, FIG. 2 is a principle diagram of coordinate position detection of a sounding body in an embodiment of the present invention, and FIG. 3 is a remote control diagram showing an embodiment of the present invention. Principle diagram of detecting the coordinate position on the video display device indicated by the pointing stick, 4th
The figure is a schematic configuration diagram showing another embodiment of the present invention. 1...Remote instruction stick, 2-4...Sounding body, 5...Trigger button, 6...Sounding body switching switch, 7.
・・Voices 12-14...Waveform shaper, 15-17...
Timekeeping device. 18... Oscillator, 19... MPU, 20... Infrared light emitting element, 21... Infrared transmitter, 22... Timing generator, 23... Infrared light receiving element, 24...
Infrared receiver.

Claims (1)

[Claims] 1. A remote control stick has three sounding bodies that are not aligned on the same line at the tip, and a display or other video display device is equipped with a remote control stick.
The clocking device comprises three receiving elements that are not arranged on the same line and measures the time from the time when the sound wave is emitted from each of the sounding bodies until the sound wave reaches each receiving element. A remote instruction input device characterized in that a coordinate position on a video display device indicated by the indicator is detected from the time measured by the indicator.