JPH0567236B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a simulated visual field device,
The present invention relates to a simulated visual field device that can easily display a desired plane and light spot in a simulated visual field, for example, in a flight simulator or the like.

[Conventional technology]

For example, in order to display the required plane and light points in the simulated field of view of a flight simulator using a display means such as a CRT display, the current method is to draw the plane by raster scanning and randomly select light points. Raster scanning and random scanning are used to create images by scanning. The reason for this is that when looking at raster scanning displays such as those used in ordinary television receivers, even if the number of scanning lines for display is increased to, for example, 1125, the display of light spots is This is because the positional accuracy is still insufficient, so random scanning is used to display the light spots with high precision.

FIG. 4 is a block diagram showing a schematic configuration of a conventional simulated visibility device of this type. In FIG. 4, a simulated visibility calculator 1 is connected to a plane generator 2 and a light spot generator 3. , the former is connected to a scan switching section 7 via a raster scan generating section 5, and the latter via a random scan generating section 6, respectively. The scan switching section 7 is connected to a display 10 via a deflection drive section 8, the timing generation section 4 is connected to a raster scan generation section 5 and a scan switching section 7, and the image switching section 9 is connected to a plane generation section. 2
and is provided between the light spot generating section 3 and the display 10.

In such a conventional simulated visual field device, when one desired screen is to be displayed on the display 10 within a predetermined one frame time, the above one
In the first half of the frame time, a raster scan is performed to depict a plane, and in the second half, a random scan is performed to depict a light spot. To explain this operation in more detail with reference to the deflection waveform diagram of the conventional device as shown in FIG. It accepts the position data and posture data of the visual field operator's viewpoint, selects the data necessary for displaying the simulated field of view from a predetermined database stored in a built-in disk, and the basic plane data among these is generated by the plane generator 2. The light spot basic data is output to the light spot generating section 3.

The plane generation unit 2 performs perspective transformation on the two-dimensional screen coordinates of the basic plane data on the simulated space coordinates sent from the simulated visibility calculator 1, clips the screen, and stores the plane in the internal frame memory of the plane generation unit 2. Store as data.

In addition, the light spot generation unit 3, like the plane generation unit 2, performs perspective transformation on the light spot basic data,
After the necessary clipping, the data is stored in the internal frame memory of the light spot generating section 3 as light spot data.

The timing generator 4 controls the timing of the main components of the simulated visual field device.

The raster scan generating section 5 generates horizontal and vertical sawtooth waves during the raster scan period to perform scanning for displaying a plane.

Further, the random scan generating section 6 performs scanning for displaying a light spot by random deflection in the horizontal and vertical directions during the random scanning period.

Then, the scan switching unit 7 is connected to the raster scan generating unit 5
The deflection signal from the random scan generator 6 is switched depending on whether it is a raster or random scan period, and a series of deflection waveforms are sent to the display 10.

[Problems to be Solved by the Invention] Since the conventional simulated visibility device is configured as described above, it is designed to draw a light spot at an arbitrary position on the entire screen of the display by random scanning. , the fluctuation of the deflection position is large,
The problem is that it takes a considerable amount of time for the electron beam to move within the display, and the number of light spots that can be visualized cannot be increased if the deflection system has a limited scanning speed.

This invention has been made to solve the above-mentioned problems, and when a light spot is drawn by random scanning, the positional fluctuation of the electron beam during the random scanning is minimized, and the system is improved. The purpose of the present invention is to obtain a simulated visual field device capable of increasing the number of light spots that can be visualized without increasing the deflection speed.

[Means for solving problems]

The simulated visibility device according to the present invention includes a simulated visibility transmitter, a plane generator and a light spot generator, each receiving a predetermined signal from the simulated visibility calculator.
a planar scanning memory section that receives signals from the planar scanning memory section; a light spot scanning memory section that receives signals from the light spot generating section; a bidirectional raster scanning generating section that receives signals from the planar scanning memory section; a minute random scan generation section that receives signals from the point scan memory section; a scan mixer section that accepts signals from both the bidirectional raster scan generation section and the minute random scan generation section; and a deflection drive from the scan mixer section. and a timing generating section that receives a video switching signal based on the signal and the signal from the plane scanning memory section and the light spot scanning memory section and controls the timing of the required part of the display to display the desired plane and light spot. be.

[Effect]

According to the present invention, a plane is displayed during a horizontal raster scanning period of the display, and the display of light spots varies depending on the number of light spots displayed within a predetermined period of time. Random scanning is performed during the period.

〔Example〕

FIG. 1 is a block diagram showing a schematic configuration of a simulated visual field device which is an embodiment of the present invention, FIG. 2 is a deflection waveform diagram of the above embodiment device, and FIG. 3 is a part of the above deflection waveform diagram. It is an enlarged view.

First, in FIG. 1, a simulated visibility calculator 1 is connected to a plane generating section 2 and a light spot generating section 3, and the former is connected to a plane scanning memory section 21 and a bidirectional raster scanning generating section 51. The latter is connected to a scanning mixer section 71 via a light spot scanning memory section 31 and a minute random scanning generating section 61. The scanning mixer section 71 is connected to the display 10 via the deflection drive section 8, and the timing generating section 4 includes a bidirectional raster scanning generating section 51, a minute random scanning generating section 61, a plane scanning memory section 21, and a light spot scanning memory section. Further, an image switching section 91 is provided beyond the plane scanning memory section 21, the light spot scanning memory section 31, and the display 10.

Next, while also referring to FIGS. 2 and 3,
The operation of the apparatus according to the embodiment of the present invention having the configuration shown in FIG. 1 will be explained. As a result of predetermined calculation processing by the simulated visibility calculator 1, the position coordinates (Xl,
Yl) is output. Here, Xl and Yl are decomposed as follows.

Xl=Xm+Xf Yl＝Ym＋Yf However, Xm and Ym are integer parts, Xf and Yf are decimal parts.

These Xm and Ym respectively indicate the horizontal pixel position and vertical scanning line position on the display 10, and Xf and Yf indicate the position of the light spot with an accuracy of one pixel and one scanning line. There is.

The number of vertical scanning lines in a normal display is
There are about 1000 lines, and when a light spot is displayed using only this many vertical scanning lines, the positional accuracy is not high enough. Therefore, the above Xf and
It is necessary to achieve a positional accuracy of one pixel or less and one scanning line based on Yf, and therefore this fractional part is achieved by highly accurate random scanning deflection.

That is, the position of the light spot on the display 10 is determined by expressing the integer part of the position coordinates by raster scanning and by expressing the decimal part by random scanning, thereby obtaining a highly accurate light spot position.
Further, according to the device according to the embodiment of the present invention, as can be understood from the deflection waveform diagram in FIG. , is used to represent a light spot image in the manner described above.

Under the control of the timing generator 4, the required planar images are sequentially output from the plane scanning memory section 20 from the start of the horizontal raster scanning display period, and at the end of the display period (period S in FIG. 2), the planar images are output. Image output will stop.

Next, from the start of the horizontal raster scanning retrace period, the light spot scanning memory unit 30 sequentially outputs the required light spot images and their corresponding position coordinates (Xl, Yl). Then, the decimal part (Xf, Yf) of the position coordinates (Xl, Yl) of the light spot input to the minute random scan generator 61 is:
It is D/A converted and output as a minute random scanning deflection voltage. Note that during the horizontal raster scan display period, the output from the minute random scan generator 61 is stopped.

Further, the bidirectional raster scanning generating section 51 generates and outputs a horizontal bidirectional raster scanning deflection voltage and a vertical raster scanning deflection voltage under the control of the timing generating section 4 .

In the scan mixer section 71, the aforementioned raster scanning deflection voltage and minute random scanning deflection voltage are mixed and outputted as an XY deflection voltage for the display 10.

During the horizontal raster display period, the video switching unit 91
It operates to output the image from the plane scanning memory section 21 to the display 10, and to switch and output the image from the light spot scanning memory section 31 during the horizontal raster retrace period. The display 10 receives the above-mentioned X-Y deflection voltage signal and video signal, and displays a required simulated field of view image.

The plane scanning memory section 21 and the light spot scanning memory section 31 respectively accumulate position coordinates (Xl, Yl) and corresponding video signals from the plane generating section 2 and the light spot generating section 3 for a plurality of scanning lines. . The timing generator 4 also depends on the number of light spot data generated within a certain unit time from the light spot generator 3.
Controls the length of the horizontal raster scan display period and the horizontal raster scan blanking period. Through such control of the timing generator 4, the horizontal raster scanning retrace period is lengthened during scanning when the number of light spot data is large, and conversely, it is shortened during a period when the number of light spot data is small. You will be made to suffer. In addition,
Planar scanning memory section 21 and light spot scanning memory section 3
1 is provided to absorb such fluctuations.

〔Effect of the invention〕

As explained above, the simulated visibility device according to the present invention includes a simulated visibility calculator, a plane generator and a light spot generator that respectively receive predetermined signals from the simulated visibility calculator, and a light spot generator that receives predetermined signals from the plane generator. a planar scanning memory section that receives signals and a light spot scanning memory section that receives signals from the light spot generating section; a bidirectional raster scanning generating section that receives signals from the planar scanning memory section and a light spot scanning memory section that receives signals from the light spot generating section; a minute random scanning generator that receives a signal;
a scanning mixer section that receives signals from both the bidirectional raster scan generation section and the minute random scan generation section; and a scanning mixer section that receives signals from both the bidirectional raster scan generation section and the minute random scan generation section; and a timing generation section that controls the timing of the required part of the display that receives a video switching signal based on the signal and displays the required plane and light spot, and displays the plane on the display during the horizontal raster scanning period. , since the display of light spots is performed by random scanning during the retrace scanning, which varies depending on the number of light spots displayed within a certain predetermined time, the random In addition to reducing the fluctuation position of the electron beam during scanning and increasing the number of light spots that can be displayed without increasing the deflection speed of the system, the horizontal scanning period and retrace scanning period are The retrace scan period is designed to vary depending on the number of displayed light points, so when many light points are concentrated, the retrace scan period is lengthened, and when there are few, it is shortened. It becomes possible to display the light spots more efficiently, and it is possible to achieve the effect of realizing a more realistic simulated field of view.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a schematic configuration of a simulated visual field device which is an embodiment of the present invention, FIG. 2 is a deflection waveform diagram in the above-described embodiment device, and FIG. 3 is a part of the deflection waveform diagram described above. The enlarged view, FIG. 4, is a block diagram showing a schematic configuration of the conventional device, and FIG. 5 is a deflection waveform diagram in the conventional device. 1 is a simulated visibility calculator, 2 is a plane generator, 3 is a light spot generator, 4 is a timing generator, 51 is a bidirectional raster scan generator, 61 is a minute random scan generator, 71 is a scan mixer unit, and 8 is a deflection drive section,
91 is a video switching section, 10 is a display, 21 is a plane scanning memory section, and 31 is a light spot scanning memory section.

Claims (1)

[Claims] 1. A simulated visibility calculator, a plane generating section and a light spot generating section that each receive a predetermined signal from the simulated visibility calculator, a plane scanning memory section that receives a signal from the plane generating section, and a light spot generating section that receives a signal from the plane generating section. a light spot scanning memory section that receives a signal; a bidirectional raster scanning generating section that receives a signal from the planar scanning memory section; a slight random scanning generating section that receives a signal from the light spot scanning memory section; and the bidirectional raster scanning section. a scanning mixer section that receives signals from both the generating section and the minute random scan generating section; video switching based on the deflection drive signal from the scanning mixer section and signals from the plane scanning memory section and the light spot scanning memory section; a timing generating section that receives a signal and controls the timing of a required part of a display to display a required plane and light spot, the display of the plane being performed during a horizontal raster scanning period of the display; varying the display of the light spots depending on the number of light spots displayed within a certain predetermined time;
The simulated visual field device is characterized in that it performs random scanning during the retrace scanning period.