JPH0567235B2 - - 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.

[Prior Art] For example, in order to display a desired plane or light point in the simulated field of view of a flight simulator using a display means such as a CRT display, the plane is currently depicted by raster scanning. , a combination of so-called raster scanning and random scanning is being used to depict light spots by random 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. Such an operation will be explained in more detail with reference to the deflection waveform diagram of the conventional device as shown in FIG.
It accepts the position data and orientation data of the simulated visibility device operator's viewpoint from , and selects the data necessary for displaying the simulated visibility from a predetermined database stored in a built-in disk. The light spot basic data is output to the light spot generating unit 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.

Further, the light spot generating section 3 performs perspective transformation on the light spot basic data in the same manner as the plane generating section 2, and stores the data as light spot data in a frame memory inside the light spot generating section 3 after necessary clipping.

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.

[Problem that the invention seeks to solve]

Since the conventional simulated visual field device is configured as described above, it draws a light spot at an arbitrary position on the entire screen of the display by random scanning, so the deflection position fluctuates greatly.
The problem is that it takes a considerable amount of time for the electron beam to move within the display, and that 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 bidirectional raster scan generation section that receives signals from the plane generation section; a slight random scan generation section that receives signals from the light spot generation section; and from both the bidirectional raster scan generation section and the minute random scan generation section. a scanning mixer section that receives a signal from the scanning mixer section, and a display that receives a deflection drive signal from the scanning mixer section and a video switching signal based on the signals from the plane generation section and the light spot generation section and displays a desired plane and light spot. It consists of.

[Effect]

According to this invention, a plane is displayed during the horizontal raster scanning period of the display, and during the retrace scanning period, light spots are displayed by random scanning within a width determined by the retrace line.

〔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, the simulated visibility calculator 1 is connected to the plane generator 2 and the light spot generator 3, the former is connected to the bidirectional raster scan generator 51, and the latter is connected to the minute random scan generator 61. The scanning mixer section 71 is connected to the scanning mixer section 71 via each of the scanning mixer section 71. This scanning mixer section 71 is connected to the display 10 via the deflection drive section 8, and the timing generating section 4
is connected to the bidirectional raster scan generation section 51 and the minute random scan generation section 61, and furthermore, the video switching section 91 is connected to the plane generation section 2 and the light spot generation section 3.
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 (X1,
Y1) is output. Here, X1 and Y1 are decomposed as follows.

X1=Xm+Xf Y1=Ym+Yf However, Xm and Ym are the integer part, and Xf and Yf are the decimal part.

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.

A typical display has 1000 vertical scan lines.
When the light spot is displayed using only this many vertical scanning points, the positional accuracy is not sufficiently high. Therefore, it is necessary to achieve a positional accuracy of one pixel or less and one scanning line based on the above Xf and Yf. Therefore, this fractional part is achieved by highly accurate random scanning deflection. be made to do.

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, from the start of the horizontal raster scan display period, the plane generator 2 sequentially outputs the required plane images, and at the end of the display period (period S in FIG. 2), the plane image is output. output stops.

Next, from the start of the horizontal raster scanning blanking period, the light spot generation section 3 sequentially outputs required light spot images and their corresponding position coordinates (X1, Y1). Then, the decimal part (Xf, Yf) of the position coordinates (X1, Y1) of the light spot input to the minute random scan generating section 61 is D/A converted and output as a minute random scan deflection voltage. Note that during the horizontal random scan display period, the minute random scan generator 6
Output from 1 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 generation section 2 to the display 10, and to switch and output the image from the light spot generation section 3 during the horizontal raster retrace period. Then, the display 10 receives the above-mentioned X-Y deflection voltage signal and video signal,
Display the required simulated visibility image.

〔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 signal from the plane generator. a bidirectional raster scan generation section that receives signals from the bidirectional raster scan generation section and the slight random scan generation section that receives the signals from the light spot generation section; and a scan mixer section that accepts the signals from both the bidirectional raster scan generation section and the minute random scan generation section. and a display that receives a deflection drive signal from the scanning mixer section and a video switching signal based on signals from the plane generation section and the light spot generation section to display a desired plane and light spot, Since the plane on the display is displayed during the horizontal raster scanning period, and the light spots are displayed during the retrace scanning period by random scanning within a width determined by the retrace line, the random scanning The effect of this is that the fluctuation in the position of the electron beam becomes smaller, and the number of light spots that can be displayed increases without increasing the deflection speed of the system.

[Brief explanation of drawings]

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 unit, and 10 is a display.

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, and a bidirectional raster scanning generating section that receives a signal from the plane generating section and the light spot generating section. a scan mixer section that receives signals from both the bidirectional raster scan generator and the slight random scan generator, and a deflection drive signal from the scan mixer section and the plane. A simulated visibility device comprising a generating section and a display that receives a video switching signal based on a signal from the light spot generating section and displays a required plane and light spots, the display of the plane being horizontally raster scanned on the display. A simulated visual field device characterized in that the light spot is displayed during a retrace scanning period by random scanning within a width determined by the retrace line.