KR0178901B1 - Auto-control circuit of vertical size of wide tv receiver - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical size automatic control circuit according to wide mode switching in a wide vision TV receiver. The present invention relates to a tuner that tunes a channel of a broadcast signal received from an antenna, and to a speaker by processing an audio signal from a broadcast signal output from the tuner. Audio processing unit for outputting, Image processing unit for processing the video signal among the broadcast signals output from the tuner according to the user's wide / standard mode switching, and outputting to the CRT, Vertical deflection unit and vertical deflection unit for processing the vertical deflection and water deflection, each part In a wide vision TV receiver having a microcomputer for controlling a signal, when the user switches to the wide mode by the user, the vertical center of the vertical deflection unit is determined by determining whether the upper / lower black band is present from the video signal input through the tuner. It is composed of a deflection control unit for controlling the deflection current. Accordingly, by determining whether the video signal inputted by the user is in the upper / lower black band, the vertical center and the deflection current are adjusted to adjust the vertical size so that the screen without the black band can be viewed during the wide mode switching.

Description

Vertical size automatic control circuit of wide vision television receiver

1 is a view for explaining the external vision.

2 is a diagram for explaining a wide vision pattern.

3 is a schematic block diagram of a wide vision TV receiver employing a vertical size automatic control circuit according to the wide mode switching according to the present invention.

4 is a block diagram showing a vertical size automatic control circuit according to the wide mode switching according to the present invention.

5 (a) to 5 (d) are diagrams showing an example of vertical size adjustment with or without black band in FIG.

* Explanation of symbols for main parts of the drawings

31: tuner 32: voice processing unit

33: image processing unit 34: horizontal deflection unit

35: deflection control unit 36: vertical deflection unit

37: micom 41: horizontal synchronous signal separator

42, 43: first and second counters 44: 1H integrator

45: averager 46, 47: first and second switches

48, 49: first and second comparators 50, 51: first and second inverters

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wide vision TV receiver, and in particular, mode switching for automatically adjusting the vertical size using a blank band of a video signal according to the wide (16: 9) / standard (4: 3) mode switching. It relates to a vertical size control circuit.

As shown in FIG. 1, a wide vision TV receiver is a 4: 3 signal transmitted from a transmitting side when a wide mode is selected by a user on the receiving side. Wide vision is about 1.33 times the horizontal direction of the screen without changing the scanning line. For example, a movie program has an advantage of being realistic when viewed on a screen having an aspect ratio of 16: 9.

Therefore, the color bar signal is 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 transmission side transmits the transmission signal by pore.

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 effective horizontal time (26.46 kHz). 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 pattern for wide vision: aspect ratio (16: 9 aspect ratio) and letter box (cinema mode) size.It is compressed in 4: 3 screen as in Fig. 2a, but it is compressed as in Fig. 2b. If you look at 9 screens, they are displayed in full screen.

Accordingly, an object of the present invention is to provide a vertical size automatic control circuit according to a wide mode switching to adjust the vertical size by determining the presence / absence of black / white bands of an input image signal when a wide mode switching is performed by a user in such a wide vision TV receiver. It is.

In order to achieve the above object, the vertical size automatic control circuit according to the wide mode switching according to the present invention processes a voice signal from a tuner for tuning a channel of a broadcast signal received from an antenna and a broadcast signal output from the tuner, and outputs it to a speaker. Audio processing unit, Image processing unit that processes the video signal among the broadcast signals output from the tuner according to the user's wide / standard mode switching, and outputs to the CRT, Vertical deflection unit and vertical deflection unit for processing the vertical deflection and the water deflection, and control each part Wide Vision TV receiver equipped with a microcomputer to switch to wide mode by the user. And a deflection control unit for controlling the vertical center and the deflection current in the vertical deflection unit by determining the presence / absence of the upper / lower black band from the image signal input through the tuner.

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

3 is a schematic block diagram of a wide vision TV receiver employing a vertical size automatic control circuit according to the wide mode switching in accordance with the present invention. The tuner 31 tunes a channel of a broadcast signal received from an antenna, and Under the control of 37, the voice processing unit 32 which processes the audio signal among the broadcast signals tuned by the tuner 31 and outputs it to the speaker SP, and under the control of the microcomputer 37, is tuned by the tuner 31. An image processing unit 33 for processing an image signal among broadcast signals and outputting the same to a CRT, a horizontal deflection unit 34 for processing horizontal deflection from a horizontal synchronization signal output from the tuner 31, and a microcomputer 37; Under the control of the deflection control unit 35 to control the vertical deflection by determining the presence or absence of the image signal from the brightness signal output from the tuner 31, and to control the vertical deflection under the control of the deflection control unit 35 The deflector 36 and the key input unit (not shown) According to the standard / wide mode switch for outputting a mode switching signal to the deflection control unit 35. On the other hand it consists of a voice processing unit 32 and the image processing microcomputer 37 for controlling (33).

4 is a block diagram showing a vertical size automatic control circuit according to the wide mode switching according to the present invention, wherein the horizontal synchronous signal separator 41, the first and second counters 42 and 43, the 1H integrator 44, An averager 45, first and second switches 46 and 47, first and second comparators 48 and 49, and first and second inverters 50 and 51; In this case, the first and second inverters 50 and 51 may be removed.

5 (a) to 5 (d) are diagrams showing examples of vertical size adjustment according to the presence or absence of black and white bands in FIG. 4, and FIG. 5 (a) is a case in which there is no black band, and FIG. The upper black band exists, the 5th (c) degree is a case where a lower black band exists, and the 5th (d) degree is a case where both the upper and lower bands exist.

Next, the operation of the present invention will be described with reference to FIGS. 3 to 4.

In FIG. 3, the tuner 31 tunes a channel of a broadcast signal received by the microcomputer 37 through an antenna according to a user's channel up / down signal to the audio processor 32 and the image processor 33. Output

The sound processor 32 performs an operation such as image detection, voice intermediate frequency amplification and frequency modulation and demodulation on the voice signal separated from the broadcast signal tuned from the tuner 31, and then amplifies and outputs the result to the speaker SP. The processor 33 performs an operation such as image detection, image amplification, and chroma processing on the video signal separated from the broadcast signal tuned from the tuner 31, and then amplifies and outputs it to the CRT.

The horizontal deflection unit 34 and the vertical deflection unit 36 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 31, respectively.

The deflection control unit 35 operates only when the standard / wide mode switching signal is input from the microcomputer 37 to determine the presence or absence of up / down black bands from the output signal of the tuner 31, and according to the result, the vertical deflection unit 36 ). If the standard / wide mode switching signal is not input from the microcomputer 37, it does not operate, and the output signal of the tuner 31 is directly applied to the vertical deflection unit 36. The vertical deflection unit 36 will be described in more detail with reference to FIGS. 4 and 5 as follows.

In FIG. 4, the horizontal synchronizing signal separator 41 separates the horizontal synchronizing signal from the output signal of the tuner 31, and the first counter 42 and the second counter 43 are 31 to the horizontal synchronizing signal, respectively. 99H, 182 ～ 246H are counted to determine the existence of upper and lower inferior and lower inferior.

The 1H integrator 44 integrates the output signal of the tuner 31 by 1H scan line and averages the output signal to the first and second switches 46 and 47, respectively. At this time, the signal output from the averager 45 becomes an average luminance level of 1H.

In the first and second switches 46 and 47, the output signals of the first and second counters 42 and 43 are used as the switching signals, and the output signals of the averager 45 are converted into the first and second comparators 48 and 47, respectively. Respectively).

In the first and second comparators 48 and 49, the output signals of the first and second switches 46 and 47 are respectively compared with a predetermined reference voltage, that is, the black bar determination reference level, and the result is compared with the first and second comparators. It is inverted by the two inverters 50 and 51 and applied to the vertical deflection portion 36. At this time, the control method of the vertical deflection unit 36 according to the logical combination of the output A, B is shown in Table 1.

That is, when A and B is '00', there is no black band, and thus the state is the same as in FIG. 5 (a). When A and B is '01', the upper black band is present, so As shown in Fig. 5 (c), after adjusting the vertical center upward, the deflection current is increased, and when A and B are '10', the lower black band exists. When A and B are '11', since both upper and lower black bands exist, the vertical center is not increased and only the deflection current is increased as shown in FIG. 5 (d).

On the other hand, the microcomputer 37 has various wide / standard mode switching, image control (luminance / contrast) and audio 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).

As described above, in the vertical vision automatic control circuit according to the wide mode switching in the wide vision TV receiver according to the present invention, the vertical center and the deflection current are determined by determining whether the video signal inputted by the user is in the upper / lower black band. By adjusting the vertical size to adjust the wide mode there is an advantage that you can watch the screen without the black band.

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 (1)

When the control signal according to the wide mode switching is input to the microcomputer 37, the vertical center and the deflection of the vertical deflection unit 36 are determined by determining the presence or absence of the upper and lower black bands from the luminance signal Y output from the tuner 31. In the vertical size automatic control circuit of a wide vision television receiver which controls current, a horizontal synchronous signal separator (41) for separating a horizontal synchronous signal from a luminance signal (Y) output from the tuner (31), and The control signal is output by counting 31 to 99H and 182 to 246H from the horizontal synchronous signal output from the horizontal synchronous signal separator, respectively, for the luminance signals of the first and second counters 42 and 43 and the tuner 31. 1H integrator 44 for integrating and outputting a luminance signal for one horizontal scanning period, an averager 45 for obtaining an average value of luminance of 1H by calculating the average from signals output from the 1H integrator 44, and the first According to the control signals of the two counters 42 and 43 The first and second switches 46 and 47 for controlling the average luminance value output from the average averager 45 and the average values output from the first and second switches 46 and 47 are compared with the reference values. And a result of which the first and second comparators 48 and 49 are applied to the vertical deflection unit 36 to control the vertical center and the deflection current.