JPS62501464A - Line flicker removal device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Line 7 Lisoka removal device The present invention provides a method for displaying 37 television images on the image reproduction screen of a television picture tube, for example. When displaying graphic characters, symbols, figures, etc. (hereinafter referred to as characters) with The line-to-line flicker removal device is the starting point.

Television signals transmitted according to the television standard are reproduced using an interlaced scanning method. It will be done. This aims to increase the flicker frequency to a total practically imperceptible Ru. In interlaced scanning, the television image is recorded in two sequentially recorded +1/2 lines each. is generated by reproducing a field with scan lines of The lines are interlaced in a ``comb'' shape by writing alternately with even and odd lines. has been done. This increases the image switching frequency for one frame.

This interlaced scanning method is characterized by so-called flicker between lines when a still image, especially a figure, is to be reproduced. It has a major drawback in that it appears strongly in Flicker between lines is particularly strong on horizontal lines. Cheating. Therefore, when playing this kind of graphic character, the scan line skips the Bonseki rope. First, it is known to write two fields interleaved with each other. This results in displayed. Flicker between lines, which is recognized as a disturbance in the vertical direction of the character, is also It is no longer visible to the naked eye (Federal Republic of Germany Patent Application Publication No. 2949020) Public bulletin).

While playing the Graph Ink character, the TV image transmitted at the same time can also be played back. It is known that it can be reproduced as a landscape. Block interlaced scanning in general using the above method , the disadvantage is that the resolution of the reproduced television image becomes low. . This is because the scanning lines form pairs. However, during this so-called mixing operation, It is desirable to ensure that the quality of television images played back in the background is not compromised. . Therefore scan line skipping can occur during some scan lines, e.g. at the lower edge of the image. It is known that the function is blocked only when playing back the Graph Ink character that has been inserted. be. In this way, most of the television picture will certainly have good resolution. However, the resolution is not very good during the character's fade-in period.

This method is described in German Patent No. 30 38 144.

Scan line skipping is interrupted by additionally vertically deflecting the electron beam using a main vertical deflection coil. It is done by doing.

However, here the quantitative line skipping of the entire scan line duration is interrupted, which is inconvenient. Horizontal lines appear and overlamp the television image with a noise pattern .

The fourth object of the present invention is to reproduce a graph ink character that has been faded in. , line-to-line flicker can be removed without compromising the quality of the simultaneously received hole television picture. It consists in excluding. This problem is solved by the invention as defined in the claims. Main departure Additional embodiments of the invention are described in the Embodiments section.

The present invention provides a method for simultaneously playing television signals and graphic characters. Even in the horizontal direction, scanning line skipping continues for the television signal, and thus has the advantage of maintaining the quality of all images.

Next, one embodiment of the present invention will be explained in detail using the drawings.

Fig. 1 is a schematic side view of the circuit device of the present invention, and Fig. 2 is a book about a television receiver. FIG. 3 is a circuit diagram of the device of the invention.

Temporarily, it is possible to block scanning line skipping when playing back Btx or VT (videotex) signals. shall be severed. The Btx decoder can e.g. In order to increase the contrast of the character, the underlying television signal is Sends a fade-out signal to erase. This fade-out signal is field It is logically combined with the identification signal. Fade out signal FB (high speed blanking) NPN) is added to the base of transistor 1, and the collector of NPN) is active. It is connected to an operating voltage source UB via an operating resistor 2. Transistor 1. emmy The terminal is grounded via a resistor 3. The emitter is provided with a field via preresistor 4. A code identification signal HK is added, and this signal conducts transistor 1 for a period of 17 frames. Switch to open state. Another PNP for the collector of transistor 1) transistor 5 The emitter of this another PNP) transistor is connected to the resistor 6. ′! ! - connected to the operating voltage source UB through the An additional deflection coil pair is connected to the deflector circuit. The additional deflection coil pair is the picture tube. It is mounted near the main vertical deflection coil in the neck. Additional deflection due to its arrangement The current flowing through the coil causes an additional vertical shift of the electron beam. Additional to the above The sweep oscillator skips lines only for the duration of the faded-in symbol. do. Therefore, it must be in a state where it is controlled on and off by the video frequency. stomach. The switching time is 200 mS in size.

Therefore, in order to block scanning line skipping, the main deflection coil must have an inductance and a winding. It is unsuitable because the capacity is large. Existing deflection amplifiers also cannot handle the sudden changes in current required. I can't make you do it. Therefore, a sweep oscillator with a limit frequency of 4.5MHz is required. It is. In cooperation with an additional auxiliary deflection coil with low inductance, Deflection power required? Obtainable. Time constant L/R is small due to high switching speed I have to go. A coil printed on a single sheet is attached to the picture tube neck. It is advantageous to wrap it around. The important thing is that the sweep oscillator transistor is in the saturation region. is not controlled and thus the switching process is not delayed by accumulated charge carriers. It is to do so. Select the operating point of the additional sweep oscillator transistor accordingly This is achieved by: Small transistor for low deflection power Star is enough. The sweep oscillator shown in FIG. 6 An important point is that the lead wire to the additional deflection coil 7 10'ff, Lee)-' line is made very short to minimize the inductance. That's what it means. The pair of deflection coils is connected to a tube behind the deflection unit 12 of the picture tube 9. It is located in Bunek. The deflection unit is partially shown without the deflection coil 7. (shown by cutting out). Plug connection 11 is installed in the sweep oscillator circuit for all equipment. Connect to the external signal voltage source and operating voltage source.

[Daylight survey report INTERNATIONAL A? l’l:JCAτXON No, PCT/ EF' 85100624 (S8 11308) EP-A-00532070 9106/82 US-A-452177404106/85US-A-441 5889yu 5/11/83 Nc, +e

Claims (7)

[Claims] 1. Graphic characters are displayed on the image playback screen along with the television image. An additional deflection amplifier is provided in the device for eliminating line-to-line flicker when and the additional deflection amplifier generates an additional deflection during the duration of the graphic character. The coil (7) is energized so that the additional deflection coil remains for the duration of the character regeneration. The line-to-line shift is characterized in that the electron beam is shifted by substantially one scanning line width between the lines. Ritsuka removal device. 2. The operating point of the additional deflection amplifier is such that the transistors used reach their saturation region. The line-to-line flap according to claim 1 is set such that conduction control is not performed until Ritsuka removal device. 3. An additional deflection amplifier provides spatial additional deflection to reduce lead inductance. The inter-line flicker remover according to claim 1, which is provided near the directing coil (7). removal device. 4. An additional deflection amplifier is provided in the picture tube socket plate (8). The inter-line flicker removing device according to item 1. 5. The additional deflection coil (7) consists of a sheet coil surrounding the picture tube network. The inter-line flicker removing device according to scope 1. 6. A coincidence circuit is provided, and the coincidence circuit is transmitted along with the graphic signal. Added based on the match between field out pulse (high speed blanking) and field identification signal Any one of claims 1 to 5 that generates a control amount to the deflection coil (7). The inter-line flicker removing device according to item 1. 7. The control variable for the additional deflection coil (7) is triggered or activated upon coincidence1. 7. The line-to-line flicker eliminating device according to claim 6, which is transmitted from two deflection amplifiers.