KR0178902B1 - Scan interpolation circuit of wide television receiver - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scan line interpolation circuit of a wide vision TV receiver, comprising: a tuner for tuning a channel of a broadcast signal received from an antenna, a voice processing unit for processing an audio signal among the broadcast signals output from the tuner, and outputting it to a speaker; Wide image processing unit which processes video signal among user's broadcasting signals according to user's wide / standard mode switching and outputs it to CRT, vertical deflection part which handles vertical deflection and water deflection, vertical deflection part, and microcom which controls each part In the vision TV receiver, when switching to wide mode by the user, interpolating the scan line when the vertical center and the deflection current in the vertical deflection part are controlled by judging the presence or absence of the upper / lower black band from the image signal input to the tuner. Scan line interpolation section. Therefore, it is possible to prevent the screen from being blurred by reducing the number of vertical lines to be scanned in adjusting the vertical size by increasing the vertical center and deflection current by determining the presence or absence of the black / white black band of the input image signal when the user switches the wide mode. have.

Description

Scanning Line Interpolation Circuit for Wide Vision Television Receivers

1 is a diagram for explaining wide vision.

2 is a diagram for explaining a wide vision pattern.

3 is a diagram showing scan line changes when the vertical deflection current is increased to remove the upper and lower black bands.

4 is a diagram showing an image of 360 lines valid in a 16: 9 wide screen.

5 is a block diagram showing a scan line interpolation circuit according to wide mode switching according to the present invention.

6 is a detailed block diagram of the upper and lower black band discrimination unit in FIG.

* Explanation of symbols for main parts of the drawings

1: control unit 52,55,57: first to third memory

54: upper and lower black plate discrimination unit 56: interpolation unit

61: horizontal synchronous signal separator 61,63: first and second counters

64: 1H integrator 65: average

66, 67: first and second switches 68, 69: first and second comparators

70, 71: first and second inverters

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wide vision TV receiver. In particular, when the vertical deflection current is increased to remove the upper and lower black bands after determining the presence of the upper and lower black bands according to the wide (16: 9) / standard (4: 3) mode switching. The present invention relates to a scanning line interpolation circuit for reducing the number of vertical lines to be scanned by interpolating a scanning player and preventing the screen from being blurred.

As shown in FIG. 1, when the wide mode is selected by the user on the receiving side, a widescreen aspect ratio of 16: 9 does not change the scanning line. The horizontal direction of is extended by about 1.33 times. Movie programs and the like have an advantage of being realistic when viewed on a screen having an aspect ratio of 16: 9.

Therefore, the color bar signal and the like are only expanded in the horizontal direction, and the 4: 3 signal may be used as it is, but the frequency is changed by the horizontal expansion such as the circle or multiburst signal. The transmitting side transmits by providing a transmission signal.

The image data of the 16: 9 wide pattern is calculated to be the same as the 4: 3 signal in the number of vertical lines, and the horizontal time axis is compressed so that it falls within the horizontal time (26.46 ms). Therefore, the R, G and B outputs are 4/3 at the frequency and 3/4 times at the half width (HAD) of sin ² .

There are two types of patterns for wide vision: aspect ratio 16: 9 and letter box (cinema mode) size, which are compressed when viewed from 4: 3 screen as shown in FIG. 2A, but as shown in FIG. 2B. : 9 When you see the screen, it looks normal on the whole screen.

On the other hand, when the image screen in the standard mode (4: 3) is seen in the wide mode (16: 9), as shown in Figure 3, a blank band (blank band) is generated on the upper side and the lower side to inconvenience the user. Therefore, the vertical deflection current is increased to remove the upper and lower black bands. However, in this case, as shown in FIG. 3, the number of vertical lines to be scanned decreases, which causes a problem of blurring of an image. On the other hand, the valid image in the 16: 9 wide mode is 480/12 * 9 = 360 lines out of the remaining 480 lines except for the vertical blanking period in the NTSC 525 lines as shown in FIG.

Accordingly, an object of the present invention is to increase the vertical deflection current in controlling the vertical size by determining the presence / absence of the upper / lower black bands of the video signal input when the wide mode is switched by the user in the wide vision TV receiver to solve the above problems. To provide a scan line interpolation circuit for interpolating scan lines.

In order to achieve the above object, the scan line interpolation circuit according to the wide mode switching according to the present invention is a tuner for tuning a channel of a broadcast signal received from an antenna, and a voice processor for processing a voice signal from a broadcast signal output from the tuner and outputting it to a speaker. Image processing unit that processes video signal among broadcast signals output from tuner according to commercial wide / standard mode switching, and outputs to CRT, vertical deflection part and vertical deflection part which handles vertical deflection and water deflection In the wide vision TV receiver having a control, when switching to the wide mode by the user, the vertical center and the deflection current in the vertical deflection portion are controlled by determining whether the upper / lower black band is present from the image signal input through the tuner. In this case, a scan line interpolation unit for interpolating the scan lines may be included.

Hereinafter, with reference to the accompanying drawings will be described in detail an embodiment of the present invention.

5 is a block diagram showing a scanning line interpolation circuit according to the wide mode switching according to the present invention, wherein the control unit 51, the first to third memories 52, 55, 57, the upper and lower black discrimination units 54, and the beam are shown. It consists of an executive part 56.

6 is a detailed block diagram of the upper and lower black bar discrimination unit 54 in FIG. 5, wherein the horizontal synchronization signal separator 61, the first and second counters 62 and 63, the 1H integrator 64, An averager 65, first and second switches 66 and 67, first and second comparators 68 and 69, and first and second inverters 70 and 71; In this case, the first and second inverters 70.71 may be removed.

Next, the operation of the present invention will be described with reference to FIGS. 5 and 6. Before describing the operation according to the configuration of FIG. 5, a general wide vision TV receiver will be briefly described.

The tuner tunes a channel of a broadcast signal received through an antenna by a microcomputer according to a channel up / down signal of a user and outputs the channel to a voice processor (not shown) and an image processor (not shown). . The audio processor performs sound detection, voice intermediate frequency amplification, and frequency modulation and demodulation on the audio signal separated from the broadcast signal tuned from the tuner, and then amplifies and outputs the audio signal to the speaker. Image detection, image amplification, and chroma processing are performed on the separated image signal, and then amplified and output to the CRT. The horizontal deflection unit (not shown) and the vertical deflection unit (not shown) respectively process horizontal deflection and vertical deflection of the CRT using the horizontal synchronization signal and the vertical synchronization signal included in the broadcast signal tuned from the tuner. Meanwhile, the microcomputer (not shown) switches various wide / standard modes, image control (luminance / contrast), and voice control (volume / balance control) by a command applied from a key input unit (not shown) consisting of a remote controller or a front panel. This function is to perform channel tuning, picture-in-picture board control, power on / off, voice mode selection, A / V switching and OSD (On Screen Display).

Returning to FIG. 5, the controller 51 supplies a read address of the first memory 52 to output an image of a line stored at the corresponding address.

In the 16: 9 wide mode, the first memory 52 stores a valid 360-line image for each line or outputs a composite image signal input through the switch 53 according to the determination result of the upper and lower black discrimination units 54. Save it.

The upper and lower black discrimination units are used to determine the presence or absence of upper and lower black bands with respect to the image signal input from the tuner in the 16: 9 wide mode, which will be described in more detail with reference to FIG. 6.

6, the horizontal synchronous signal separator 61 separates the horizontal synchronous signal from the output signal of the tuner, and the first counter 62 and the second counter 63 are 31 to 99H, respectively, for the horizontal synchronous signal. 182 ～ 246H is counted to determine the presence of upper and lower inferior and lower inferior.

The 1H integrator 64 integrates 1H scan lines with respect to the output signal of the tuner, averages the average in the average 65, and outputs them to the first and second switches 66 and 67, respectively. At this time, the signal output from the averager 65 becomes an average luminance level of 1H.

In the first and second switches 66 and 67, the output signals of the first and second counters 62 and 63 are used as the switching signals, and the output signals of the averager 65 are used as the first and second comparators 68, 69) respectively.

In the first and second comparators 68 and 69, the output signals of the first and second switches 66 and 67 are compared with a predetermined reference voltage, i.e., the black bar determination reference level, and the results are compared with the first and second comparators. It is inverted by the two inverters 70 and 71 and applied to the switch 53. At this time, the control method of the switch 53 according to the logical combination of the output A, B is shown in Table 1 below.

That is, when A and B are '00', since there is no black band, scan line interpolation is not required. Therefore, the composite image signal is stored in the first memory 52. When A and B are '01', Since there is a band, the vertical center is adjusted upward, then the deflection current is increased, and the scan line interpolation is performed. When A and B are '10', the lower black band exists, so the vertical center is adjusted downward. After the deflection current is increased, scan line interpolation is performed. When A and B are '11', both upper and lower black bands exist, so the vertical center is increased and only the deflection current is increased.

The second memory 55 stores line images read out from the first memory 52 by three lines under the control of the controller 51, and interpolates the interpolation unit 56 to output four line images. 3 Stored in the memory 57. The interpolated image stored in the third memory 57 is input to the image processor and processed.

As described above, in the wide-vision TV receiver, the scan line interpolation circuit according to the wide mode switching according to the present invention increases the vertical center and the deflection current by determining the presence / absence of the image signal inputted by the user during wide mode switching. If the vertical size is adjusted to reduce the number of vertical lines to be scanned, there is an advantage of preventing the screen from being blurred.

The present invention is not limited to the above embodiments, and it is apparent that many modifications are possible by those skilled in the art within the technical idea to which the present invention pertains.

Claims (2)

In the scanning line interpolation circuit of a wide vision television receiver which interpolates the scanning line according to the presence or absence of the black and white bands of the tuner when the wide mode is switched, the black and white The upper and lower black bar discrimination unit 54 which determines whether there is a stand and outputs a control signal, and a switch which stores valid 360 lines of images or is controlled by the black bar discriminator 54 according to the control signal of the controller 51. First memory 52 to store the image signal input through the 53, a second memory 55 for storing the line image stored in the first memory 52 by three lines, the second memory ( An interpolation unit 56 for outputting a 4-line image by interpolating the 3-line image output from 55), and storing the 4-line image output from the interpolation unit 56 and outputting the 4-line image to the image processing unit. Including the third memory 57 A scanning line interpolation circuit of a wide vision television receiver, characterized in that the present invention. The horizontal sync signal separating unit 54 of claim 1, wherein the upper and lower black plate discriminating units 54 output horizontal sync signals from the luminance signal Y of the tuner from the horizontal sync signal separator 61 and the horizontal sync signal separator 61. The first and second counters 62 and 63 which count 31 to 99H and 182 to 246H from the horizontal synchronous signal, respectively, and output the control signal, and integrate the luminance signals of one horizontal scanning period with respect to the luminance signals of the tuner, respectively. Control signals of the 1H integrator 64 to output, the averager 65 to calculate the average from the signals output from the 1H integrator 64, and output a luminance average value of 1H, and the control signals of the first and second counters 62 and 63. According to the first and second switches 66, 67 and the first and second switches 66 and 67 which intermittently output the average values of the luminance output from the averager 65. And a first and second comparators 68 and 69 for comparing and outputting the result. Scanning line interpolator.