SU62020A1 - The method of transmitting and receiving stereoscopic television - Google Patents

Description

TRANSMISSION AND RECEPTION METHOD OF STEREOSCOPIC

It was announced on November 23, 1940 for j 39294 (303958) to the People's Commissariat.

Stereoscopic perception (considerations do not require 1 st; c on the image of two images of the same subject taken from the subject at two different angles of view; let's call them right and left, according to which eye they belong to.

FIG. 1 is a schematic diagram of the stereoscopic transmission and reception; in fig. 2 - using a blanking generator; in fig. 3 and 4 - using four reflective surfaces and a obturator; in fig. 5 - using vibratory grids.

In the proposed method of transmitting and receiving stereoscopic tev television, both television images are transmitted on the same electrical channel, alternating in time so that all even frames are, for example, right and odd frames are left images.

For this singing, at the place of transmission, two identical transmitters, placed with respect to the object from different angles corresponding to one to the right and the other to the left eye, are applied. The television signals from these cameras (Fig. 1) enter the common channel, are amplified and follow further to the television receiver inclusively in the same way that the television signals travel in conventional television.

In order for the signals of even semi-frames to go only from one camera, for example, from the right, and the odd ones — from the other, left, an electronic or simple electromechanical automatic switch K can be placed in the path of the signals from these cameras to the intermediate amplifier (Fig. 1 ), rotated by a synchronous motor.

However, it is best to ensure that the alternation of the operation of the chambers according to the invention is ensured by alternately supplying blanking signals of increased duration to these chambers. The duration of these blanking signals must be equal to the duration of the usual blanking signal plus the full duration of the transmission of one adra with its blanking signal. The advantage of this method of switching cameras is that the sensitivity of each camera doubles as usual, due to twice the accumulation time of the charge on the mosaic of each transmission tube.

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No. 62020-2

FIG. Figure 2 shows a diagram with two separate chambers, the device and the action of which does not require an explanation, if you take into account the above you.

It is completely natural that one common chamber with two mosaics can be built: one for the right and the other for the left image.

At the end, by attaching four reflective surfaces (Figs. 3 and 4) and a special obturator, which allows to project the right, then the left image onto the mosaic, it is possible to obtain the same effect using a single mosaic.

Here it is convenient to use two empty grids of vertical stripes deposited on transparent films as the obturator. Saga:; l with the help of an electromagnet EM one of the grids can be vibrated simultaneously with the frame rate (Fig. 3), it is possible with a known location; These strips will ensure that for all even-numbered frames in the formation of charges on the mosaic, the luminous flux from the right of the image will be involved, and for even 1 - from the left.

The latter method, i.e., the method of presenting both images iui one; the mosaic, can be recommended for television broadcasting of stereo films, since in this case it is not so dangerous that one last part of the luminous flux is inevitably lost.

The reception of the image is made by a conventional television receiver. To obtain the effect of stereoscopy, it is necessary for L, your eye to see only the left image, and the right one - only to the right. To do this, two thick meshes are used, consisting of frequent vertical stripes, made by a mechanical photographic method on a stack of de, mica, a celluloid film or pa kako.1-or another transparent material.

The grid Y (Fig. 5) is placed between the viewer and the kinescope screen, and the grid 2 is located at a small distance from the grid J so that the receiving image of the left image frame the grid 2 covers for the right eye, and when receiving the right image frame the same grid would close it for the left eye. At the same time, in front of the screen of the kinescope there are areas of visibility of the right and. left images. The chirping of visible areas is determined by the distance between the eyes and fills most of the visual space in front of the screen. By placing the eyes in the respective areas of the right and left image, the viewer will feel the three-dimensional image.

To obtain such an effect, grid 2 must vibrate synchronously with the frequency. The motion of the grid 2 pro; 1 sklodt in the horizontal directional direction, perpendicular to the stripes of the grids. The amplitude of oscillation of the field 2 is selected at the visibility from the width of the strips of the grids / and 2 and from the distance between these grids in order to obtain the same width of the visibility areas. In practice, this amplitude can reach several tenths of a millimeter.

The oscillations of the grid 2 are made by means of an electromagnet 3, from which the grid is connected. The power of the electromagnet is synchronized with the frame rate from the corresponding 1, its relaxation generator of the television receiver or directly from the AC network.

Device with a vibrating grid Can be made as a separate frame (stereo nozzle) attached to the receiver from the outside.

Making nets the easiest way to photographically. The grid 2 may be a negative image of the grid / obtained by projecting light onto the photosensitive film through the grid 7 from a source located in the seat of the viewer 4. With this method of making grid 2, the pattern of the distribution of strips of this grid required for the best stereo effect is automatically obtained.

When installing grids / and 5 in front of the receiver's screen, it may be desirable to ensure that there is a slight bias between them and feed the electromagnet to 3 frame frequency TOKOJM.

The main advantages of this stereo-television system compared to others (the method of optical combining of two images, the method of colored glasses, two transmission channels, etc.) are as follows:

1. It is possible to use for this purpose conventional television equipment, both receiving and transmitting, without significant alterations of this equipment.

2. Simplicity is manufactured} and the cost of implementing the method is low, that oco6efiHO is important when applied to receivers.

3. The possibility of simultaneously d, t is a whole gr — 3: 3; it is possible to watch a stereoscopic television image on the kinokon screen without the use of special glasses.

4. The possibility of applying the method in individual use televisions, i.e. in non-projection systems, also without reworking them.

5. The ability to quickly go to school, from ordinary television programs to stereo television and back.

Subject and reference; n

Claims (2)

1. A method of transmitting and receiving a stereoscopic television / shadow with the use of automatic separation of the transmission of the right and left images, differing in that the specified separation of transmission will be lent by extended signaling signals P1) lend. 2. A device for carrying out the method according to claim 1 using a conventional television, characterized in that in front of the screen of a cathode-ray tube a shutter is placed in the form of moving grids moving at an angle of stereoscopic viewing and actuated by a mechanism, for example, from a personnel signal sweep. - 3 - № 62020