SU1117862A1 - Device for reproducolour televison picture - Google Patents

Abstract

A COLOR-TELEVISION IMAGE PLAYBACK DEVICE, containing a single-beam chromatron whose cathode is connected to the output of the video amplifier, two color-selecting grids are respectively connected to the first and second outputs of the control pulse former, and the separating system is connected to the outputs of the frame of the frame, and the body of the layer has a frame. frame sweep is the input of frame sync shots, characterized in that, in order to increase vertical definition, a time scale converter is introduced The TV signal lines, the first three inputs of which are the primary color signal inputs, the output are connected by the d input of the video amplifier, and the control input is connected to the third output of the control pulse generator, the input of which is the input of horizontal sync pulses, and the fourth output is connected to the input of the block -line time (L vertiki.

Description

This invention relates to a color television technique and can be used in color television sets operating on SECAM, PAL and NTSC systems. The closest to the invention in its technical essence is a device for reproducing a television image, containing a single-beam chromatron, the cathode of which is connected to the output of the video amplifier, two color-selecting grids respectively connected to the first and second outputs of the control pulse former, and the deflection system is connected with the outputs of the frame unit and the line scanning unit, while the inputs of both scanners are the inputs of the corresponding sync pulses lj. However, the known device is a gives a reduced three-fold vertical clarity, since when the video signals of the primary colors are sequentially reproduced, the full color line is reproduced in three lines. The purpose of the invention is to increase the vertical definition. The goal is achieved by the fact that a color TV image reproducing device containing a single-beam chromatron whose cathode is connected to the output of a video amplifier, two color-selecting grids are respectively connected to the first and second outputs of the driver for controlling pulses, and the deflection system is connected to the outputs of the human and block units line scan, while the input of the frame scanner unit is the input of frame sync pulses, the time scale converter of the TV lines is additionally introduced The first three inputs of which are the inputs of the primary colors, the output is connected to the input of the video amplifier, and the control input is connected to the third output of the control pulse generator, the input of which is the input of the horizontal sync pulses, and the quarter 1 output is connected to the input of the block line scan. FIG. 1 shows a structural electrical circuit of a color TV playback device of image 622 in FIG. 2 is a structural electrical circuit for converting a time scale of video signal lines; FIG. 3 - time diagrams of voltages, which are used for the operation of the device. A color TV image reproducing device (Fig. 1) contains a single-beam chromatron 1, a video amplifier 2, a time-scale converter 3 for a horizontal TV signal, a horizontal scanning unit A, a vertical scanning unit 5, a deflecting system 6, a control pulse driver 7. Converter 3 (FIG. 2) contains two identical parts 8 and 9, each of which contains three delay lines 10-12 and keys 13-21. Lines 10-12 delays can be implemented on devices with charge coupling. The device works as follows. Three video signals of the primary colors R, G, B are received and recorded simultaneously and separately into the time scale converter 3 of the horizontal TV signal, which can store three TV signals of the primary colors simultaneously during the forward period ( in the current standard 64 µs); the possibility of alternately reading the recorded three lowercase TV signals of the primary colors for 1 / 3t time (cTp}, i.e., reading time for each lowercase TV signal is three times shorter than its recording time t c-jpj, as well as the ability to record TV The signals of the main colors of the next line during the matching of signals by the preceding line. Thus, at the output of the converter 3 time lines of the lines, the TV signals of the line recorded simultaneously and line by line are recorded alternately and line by line. The sleigh of video amplifier 2 is three times. Converter 3 consists of two identical parts 8 and 9, the operation mode of which alternates line by line. When the first part 8 of converter 3 writes simultaneously-but TV signals from the main colors from the line n, the second part to the memory Produces alternate matching of TV signals of primary colors from line n-1. In the next line period, the second part 9 of converter 3 writes TV signals of the primary colors of line n + 1, and the first line reads recorded TV signals from line n, etc. Let us consider in more detail the operation of the second part 9 of the converter 3. During the forward run of the line, all keys 13–18 receive the positive pulse Uj opening them (Fig. Sn), the input clock lines R and G are connected to the input of lines 10-12 B is written to the considered part 9 of the converter 3 of the time scale of the signals. The signals of the main colors of the next RGB colors are now recorded in the same way, but in part 8 of block 3, and from part 9 simultaneously with the beginning of the next line begins with sequential reading of signals recorded in X by alternately connecting to their clock inputs, clock read pulses using keys 19-21, alternately opened by read pulses from the driver 7 of control pulses. Since the clock frequency of the read pulses is chosen three times higher (18-21 MHz) than the clock frequency of the write, the read time of the signals from each line is also reduced by three times. Therefore, the duration of the pulses Ue, which connect the clock pulses to the lines, also decreases by a factor of three (Fig. 3b, c, d). Consequently, during a row time, the simultaneous signals of the RGB strings are converted into a serial one over time, a number of the same row signals, and three times as large as the bandwidth. RGB signals, converted into a series of successively follow the same signals, go to video. The detector 2 is amplified and this output is fed to the cathode of the single-glitter chromatron 1. 24 The line frequency in the horizontal scanning unit 4 is also increased three times and is 46,875 Hz. This frequency is synchronous and in-phase with the alternation of the lower-case RGB signals fed to the cathode of a single-beam chromatron 1 by means of synchronizing pulses output in the driver 7 of the control pulses. Synchronous and in-phase U-shaped pulses (Fig. A) are supplied to the color-selective grid from the same former 7 with a duration equal to the duration of the forward horizontal sweep, which control the color of the glow of the lines. As a result, on the screen of the single-beam chromatron 1, an alternate glow of three rows of red, green and blue is produced during the row. Since the vertical period of the line shifts the beam only to the height of the line, these three color lines almost coincide and create a full color image of this line, and therefore, the vertical definition is restored to 575 effective lines. The invention does not require the use of special measures to eliminate the drift of color lines, since it creates a normal image with the full number of lines provided by the applicable standard and can work with any of the existing color TV broadcasting systems: SECAM, PAL, and NTSC. In addition, the invention makes it possible, through the use of single-beam chromatron in well-known televisions, to significantly simplify the design of the kinescope (in chromatron and projector, instead of three in a mask kinescope); eliminate the electron beam convergence device, simplify the deflecting system, and also the raster shape correction device (as the latter, two permanent magnets are required, as in a black and white TV); eliminate the mask demagnetization scheme, reduce power consumption, reduce the weight of the TV.

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Claims (1)

A device for reproducing a color television image containing a single-beam chromatron, the cathode of which is connected to the output of the video amplifier, two color-sensing grids are respectively connected to the first and second outputs of the driver pulse generator, and the detaching system is connected to the outputs of the frame unit, and the line unit the frame scan is the input of the frame clock, characterized in that, in order to increase vertical clarity, a time scale converter is introduced a television signal lines, the first three inputs which are the inputs primary color signals, the output d is connected to input of the video amplifier, a control input connected to the third output of the control pulses, the input of which is the input horizontal sync pulses, and a fourth output connected to the input of horizontal scanning. SUU 1117862. I television and can be used in color televisions, rapo systems SECAM, PAL to