SU1140270A1 - Process for forming colour television signals in single-tube televison camera - Google Patents

Abstract

A METHOD OF FORMING TELEVISION / TV / SIGNAL FLOWERS IN A SINGLE TUBE TRANSMISSION TELEVISION CAMERA, which consists in creating color-separated images, projecting them onto the target of the transmitting TV tube, with the same points of the color-separation images having the same pattern, the ratoring pattern, the rat, the size, the same, the size, the size and the layout, the size, the rat, the size, the size, the size, the size, and the dy- projected color-separated images to the potential relief and alternately line-by-line reading of the potential relief of each of the color-separated images followed by Processing the resulting color TV signals, characterized in that, in order to increase the signal-to-noise ratio and improve the quality of color reproduction, at least three color-separated images are formed, and when projecting them onto the target of the transmitting TV tube, color-separated images are arranged symmetrically relative to the center of the target, -; TV tube.

Description

one . The invention relates to a color television technique and can be used in the development of single-tube television / TV / cameras. There is a known method of forming color TV signals in a single-channel transmitting TV camera, based on the formation of two demarcated images, projecting them onto the target of the transmitting TV tube, while the same points of color-separation images are arranged symmetrically with respect to the diameter of the transmitters of the TV tube. from color separations. The image has a linear character and is transformed into a potential relief, which is alternately and line by line read with the subsequent processing of the color TV signals obtained as a result of reading. However, this method is characterized by relatively low sensitivity and insufficiently high quality color reproduction. The decrease in sensitivity is associated with the loss of light on a fiber-optic disc on which line filters are applied. The transmission of the disk in the blue region of the spectrum has a recession, which additionally leads to a decrease in the overall sensitivity. Insufficiently high color rendering quality is associated with the unevenness of the signal from the filter within the raster. Due to aberrations at the edges of the TV raster, the TV signal from the filters is reduced. To improve it (and improve the quality of color reproduction), it is necessary to reduce the depth of modulation of the high-frequency TV signal (which also reduces the sensitivity of the camera) and to take special measures. The non-uniformity of the C-TV signal, due to the presence of a filter, is at least 15%, which is twice as high as the allowable irregularity for studio transmitting TV cameras. The purpose of the invention is to increase the signal-to-noise ratio and improve the quality of color reproduction. The goal is achieved in that according to the method of forming color TV signals in a single-tube transmitting TV camera, consisting in forming color separations, projecting them onto a target transmitting TV tubes, while the same dots 70 of color separations are located. at an equal distance from the center of the target of the transmitting TV tube, converting the projected color-separated images into potential relief and sequential line-by-line reading of the potential relief of each of the four-divided images with subsequent processing of the resulting color TV signals form at least three color-separated images, and when projecting them Color separated images are arranged on the target of the transmitting TV tube symmetrically relative to the center of the target of the transmitting TV tube. Fig. 1 shows a structural electrical circuit of the device, an easy-to-use method for generating color television signals in a single-channel transmitting television camera; 2 shows the target of a transmitting TV tube on which color-separated images are projected (the numbers correspond to the location of the same image points); Fig. Time diagrams, for explanation of the operation of the device. The Peredakica TV camera (Fig. 1) contains a shooting lens 1, team 2, astigmatism corrector 3, transfer lens 4, beam-splitting mirrors 5, achromatic mirrors 6, split the prism 7, wrapping prisms 8, plane-parallel plate 9, optical wedge 10, transmitting the TV tube 11, the signal processing unit 12, the first switch 13, the first 14, the second 15 and the third delay line for the time of one line. fourth 17 and fifth 18 delay lines at the time of two lines, sixth 19 and seventh 20 delay lines at the time of three lines, second 21, third 22 and fourth 23 switches. The device works in the following way. Using elements 1-5, after mirrors 6 are formed with color-separated images R, G, B. The light beam corresponding to image G is split into two beams with the help of a splitting prism 7, one of which is. is projected into the plane of the target through a plane-parallel plate 9 (which serves to align the optical path of the beam), and the other through the wrapping prism 8. Thus, projecting onto the target. two G images (Fig. 2). The image R and B form the turning prisms 8, which provide the image rotation in the right direction, and using the optical wedges 10 they are parallelly moved (vertically and horizontally) along the target of the transmitting TV tube 11. In Fig. 1 some additional elements that are usually found in the optical systems of transmitting TV cameras (correction light filters, elements for correcting the curvature of the field and distortion, etc.). With the arrangement of the images shown in Fig. 2, the in-phase TV signals from them (by line and frame) are provided only with the direction of deviation along line C and frame K for each raster. Color separations are read alternately, line by line. First, images G and R are read, then G and B, etc. A read on the line of left rasters G is made by the diverting influence of the input, the right R and B are shown in km km (Fig. 3a). The electron beam is transferred from the left-hand images to the right-hand images during the return code on the line — the fronts of the pulses (Fig. 3B) in time correspond to the reverse direction of the transmitting TV tube along the line. The switching frame is performed as follows. First, the two upper-images G and R are read, then the two lower G and B, then the upper again, and so on. In accordance with this form, the deflection to the effects on the frame is symmetrical square pulses of two lines (2tG). Their fronts also fall on the return stroke time on the line. The amplitude of the rectangular impulses varies linearly from maximum to zero during one field of Tr (Fig. 3). The total TV signal taken from the transponder of the TV tube 11 is a temporal line sequence of video signals from the R, G, B rasters. It enters block 12 for separation and subsequent generation of color TV signals (Fig. 32) .. 0 The mixture of TV signals R, G and B (Fig. 32) after the first switch 13 is divided into video signals R, G and B (Fig. 3, e, h). Their further formation occurs using the second, third and fourth switches 21-23, to the inputs of which TV signals are fed directly to the output of the first switch 13 and through delay lines 14-20. As a result, at the outputs of block 12, fully formed color TR signals R, G, B are formed (Fig. 3, H, K). The missing lines in the color TV signal (FIG. 3L) can also be formed from the color TV signals of nearby lines. , 1 The identity of geometric distortions of color-separated rasters obes I-;: .. penyvae dlya (only with the symmetry of the electrostatic and the deviation of Mih fields. To fulfill this requirement, it is necessary that the bulb of the transmitting TV tube had small deviations from the shape of a circular cylinder, and the parameters and geometry The deflection systems were strictly the same. This is achieved, for example, by special calibration of glass flasks or by using ceramic flasks and by using printed deflection systems when magnetic deflection is used. This ensures high quality color TV images due to higher sensitivity (better signal-to-noise ratio) and better color reproduction, and is not inferior to these multi-color TV color cameras by these parameters. The remaining image parameters can meet stringent studio requirements. that conventional transmitting TV tubes are used to form color TV signals, which eliminates the reduction in sensitivity associated with the presence of fiber optic ska in a known way. In accordance with the invention, all rasters have a solid structure (there are no filters), and the color TV signal has a continuous character. In this case, the color quality is determined only by the unevenness of the signal of the transmitting TV tube without any additional factors, t, e. it will correspond to ana5, 11402706

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Claims (1)

A METHOD FOR FORMING COLOR TV / TV / SIGNALS IN A SINGLE-TUBE TRANSMITTING TV CAMERA, which consists in forming color-separated images, projecting them onto a target of a transmitting TV tube, while the same points of color-separated images are placed at an equal distance from the TV center to the center of the target from the center of the target color-separated images into a potential relief and sequentially reading line-by-line the potential relief of each of the color-separated images with subsequent processing a color obtained as a result of reading color TV signals, characterized in that, in order to increase the signal-to-noise ratio and improve the color rendering quality, at least three color-separated images are formed, and when projecting them onto the target of the transmitting TV tube, color-separated images are arranged symmetrically with respect to the center of the target transmitting tv tube. FIG. I 1 '1140270