KR100211464B1 - Aspect ratio auto controll system of tv - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an automatic adjustment system for an aspect ratio of a television receiver that enables an automatic adjustment of an aspect ratio of a television receiver to a mode suitable for a broadcast signal.

In the present invention, a reference clock having a frequency corresponding to an integral multiple of the horizontal synchronizing signal is generated based on the horizontal synchronizing signal of the composite video signal. The horizontal synchronizing signal is counted based on the vertical blanking signal, and the reference clock is counted based on the horizontal synchronizing signal to generate a pulse signal corresponding to a predetermined horizontal synchronizing pulse section of the video signal. Then, the aspect ratio data is transmitted by coding predetermined bit data for a section corresponding to the pulse signal.

Further, in the television receiver, a pulse signal corresponding to a horizontal synchronizing pulse section to which the aspect ratio data is added is generated in the same manner as the transmission side, and the aspect ratio data detection is performed for the section corresponding to the pulse signal. The aspect ratio of the output image is automatically adjusted according to the aspect ratio data by controlling the deflection of the electron beam emitted onto the CRT (Cathode-ray Tube) based on the detected aspect ratio data.

Therefore, according to the present invention, it is possible to automatically adjust the aspect ratio according to the type of broadcasting, so that convenience for the user can be greatly improved.

Description

Automatic adjustment of the aspect ratio of TV sets

FIG. 1 is a signal waveform diagram showing a composite video signal currently being used in a broadcasting system; FIG.

FIG. 2 is a block diagram showing an aspect ratio data adding device of a broadcast system according to an embodiment of the present invention; FIG.

FIG. 3 is a circuit diagram showing a configuration of a vertical blanking signal generating unit in FIG. 2; FIG.

Fig. 4 is a signal waveform diagram for explaining the operation of the apparatus shown in Fig. 2; Fig.

FIG. 5 is a block diagram showing the configuration of a reference clock generator and a coding interval pulse generator in FIG. 2;

FIG. 6 and FIG. 7 are signal waveform diagrams for explaining the operation of the configuration shown in FIG. 5; FIG.

FIG. 8 is a block diagram showing a configuration of a data generator in FIG. 2; FIG.

Fig. 9 is a signal waveform diagram for explaining the operation of the configuration shown in Fig. 2 and Fig. 8; Fig.

FIG. 10 is a block diagram showing an aspect ratio data detecting apparatus for a broadcast signal according to an embodiment of the present invention; FIG.

FIG. 11 is a signal waveform diagram for explaining the operation of the apparatus shown in FIG. 10; FIG.

FIG. 12 is a block diagram showing a configuration of an automatic aspect ratio adjustment system of a television receiver as an example to which the present invention is practically applied. FIG.

DESCRIPTION OF THE REFERENCE NUMERALS

21: Sync separation unit 22: Vertical blanking signal generation unit

23: Horizontal sync separator 24: Reference clock generator

25: Coding interval pulse generator 26: Data generator

31: integration circuit 32: comparison circuit

33: monostable multivibrator 107: D flip flop

126: aspect ratio data detection unit 128: horizontal deflection coil

129: vertical deflection coil 134: deflection data storage unit

135: detected data storage unit 242: voltage controlled oscillator

243: clock buffer 244: frequency divider

251, 252, 253: counter 321: comparator

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a broadcasting system, and more particularly, to a system for automatically adjusting an aspect ratio of a television receiver that can automatically adjust an aspect ratio of a television receiver to a mode suitable for a broadcasting signal.

In recent years, wide-screen television receivers have been developed and used that make the viewing environment of a television set like a theater by setting the aspect ratio of the CRT to 16: 9 instead of the conventional 4: 3 aspect ratio. In addition to this wide- Prayer has been developed and is being used.

In addition, attempts have been made to produce and distribute broadcasting screens suitable for wide-screen television receivers and cinema television receivers, even in the case of broadcasting stations, in accordance with the changes of the above-described television receivers.

Therefore, in recent years, a manufacturer of a television receiver has been manufacturing and distributing a television receiver capable of adjusting an aspect ratio of an output image internally in accordance with a video screen transmitted from a broadcasting station.

In most cases, such a television receiver adjusts the aspect ratio of the output image by appropriately adjusting the deflection degree of the electron beam scanned on the CRT to the video signal.

However, in the above-described television receiver, since the mode selection for adjusting the aspect ratio of the output image is made entirely dependent on the operation of the viewer, it is very troublesome to use it, and in the case of an elderly person or a child who lacks understanding of the television receiver, There is a problem that the corresponding function can not be used.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is a first object of the present invention to provide an aspect ratio data adding device of a broadcast system which can transmit aspect ratio data to a broadcast signal according to a broadcast program in a broadcast station .

A second object of the present invention is to provide an automatic aspect ratio adjustment system for a television receiver capable of automatically adjusting an aspect ratio according to a broadcast signal transmitted with added aspect ratio data.

According to another aspect of the present invention, there is provided an aspect ratio data adding apparatus for a broadcasting system, comprising: a horizontal sync separation unit for separating a horizontal sync signal from a composite video signal; a vertical blanking signal generation unit for generating a vertical blanking signal from the composite video signal; A reference clock generating means for generating a reference clock having a predetermined frequency based on the horizontal synchronizing signal, a reference clock generating means for generating a reference clock having a predetermined horizontal synchronizing pulse interval in the vertical blanking interval based on the vertical blanking signal, Data generating means for generating a predetermined data bit to be added to the composite video signal in accordance with an external control signal and data generated by the data generating means based on the coding period pulse, And a data adding means for adding a bit to a composite video signal All.

According to another aspect of the present invention, there is provided a system for automatically adjusting an aspect ratio of a television receiver, the system including: a horizontal blanking period of a composite video signal, A deflection data storage means for storing a plurality of deflection data corresponding to an aspect ratio of a video signal to be output onto the CRT; And control means for reading the deflection data storage means based on the detection data and performing deflection control on the video signal output to the CRT.

The aspect ratio data detecting means may include a horizontal sync separator for separating the horizontal sync signal from the composite video signal, a vertical blanking signal generator for generating a vertical blanking signal from the composite video signal, A coding period pulse generating unit for generating a coding period pulse corresponding to a horizontal synchronization pulse period in which aspect ratio data is added based on the vertical blanking signal, the horizontal synchronization signal, and the reference clock, A switching unit for selectively inputting a composite video signal in a section corresponding to the coding interval pulse, and a data detector for detecting a data bit from the composite video signal input by the switching unit.

According to the present invention configured as described above, a reference clock having a frequency corresponding to an integer multiple of the horizontal synchronizing signal is generated based on the horizontal synchronizing signal of the composite video signal. The horizontal synchronizing signal is counted based on the vertical blanking signal, and the reference clock is counted based on the horizontal synchronizing signal to generate a pulse signal corresponding to a predetermined horizontal synchronizing pulse section of the video signal. Then, the aspect ratio data is transmitted by coding predetermined bit data for a section corresponding to the pulse signal.

Further, in the television receiver, a pulse signal corresponding to a horizontal synchronizing pulse section to which the aspect ratio data is added is generated in the same manner as the transmission side, and the aspect ratio data detection is performed for the section corresponding to the pulse signal. The aspect ratio of the output image is automatically adjusted according to the aspect ratio data by controlling the deflection of the electron beam emitted onto the CRT (Cathode-ray Tube) based on the detected aspect ratio data.

Therefore, according to the present invention, it is possible to automatically adjust the aspect ratio according to the type of broadcasting, so that convenience for the user can be greatly improved.

Hereinafter, embodiments according to the present invention will be described with reference to the drawings.

First, the basic concept of the present invention will be described with reference to FIG.

FIG. 1 is a signal waveform showing a general composite video signal used for transmitting a video signal in a broadcasting station, which is divided into a video signal section and a vertical blanking section as shown in the figure. Here, 3H (H is a horizontal scanning period) vertical synchronizing pulse, 3H vertical synchronizing pulse, 3H vertical equalizing pulse, and 12H horizontal synchronizing pulse are assigned to the vertical blanking interval.

On the other hand, since the vertical blanking interval is used as the retraction time of the scanning line in the television receiver, the vertical blanking interval is not normally displayed on the CRT (Cathode-ray Tube) of the television receiver.

Therefore, in most current broadcasting technologies, data not related to a broadcast signal such as a teletext broadcasting is transmitted using the vertical blanking interval. In particular, since the horizontal sync pulse interval is suitable for transmission of such information, The interval of ~ 18H is allocated for teletext broadcasting, and 21H is allocated for caption broadcasting.

In the present invention, the broadcasting station transmits and receives the aspect ratio data by adding predetermined code data to 10H to 14H, for example, 12H using a horizontal synchronization pulse interval not used in the teletext broadcasting or the caption broadcasting, The aspect ratio data added to the 12H is detected and the aspect ratio of the output image is automatically adjusted accordingly, thereby improving the convenience of the viewer.

FIG. 2 is a block diagram showing an aspect ratio data adding apparatus of a broadcasting system according to an embodiment of the present invention, which realizes the above-described concept, and FIG. 4 is an operation waveform diagram of the apparatus shown in FIG.

In FIG. 2, reference numeral 21 denotes a sync separator for separating a sync signal from a composite video signal of FIG. 4 (a), which is a sync separator for dividing a composite video signal by a predetermined slice level (B) by separating and outputting the synchronizing signal as shown in Fig. 4 (b).

Reference numeral 22 in the drawing denotes a vertical blanking signal generator for generating and outputting a vertical blanking signal from the synchronous signal "4 (b)" output from the sync separator 21, An integration circuit 31 for integrating the synchronization signal output from the synchronization separator 21 and a signal level output from the integration circuit 31 to a predetermined reference voltage set by resistors R2 and R3 And outputs a vertical blanking detection signal based on the vertical synchronization detection signal output from the comparison circuit 32. The vertical blanking detection signal is output from the comparison circuit 32, And a multi-vibrator 33. [

That is, as can be seen from the fourth (b) road, the vertical sync pulse is generally set to have a lower duty ratio than the pulse of the other signal period. Therefore, when the output signal of the sync separation unit 21 is integrated into the integration circuit 31 of the third degree, the integral value in the vertical synchronization pulse section becomes lower than the other sections as shown in FIG. 4 (c) , And if the reference voltage by the resistors R2 and R3 is input to the comparator 321 having a level indicated by a dotted line in FIG. 4 (c), the pulse width corresponding to the vertical synchronizing pulse section Is output.

When the pulse signal applied to the input terminal A1 rises to a high level, the output Q of the monostable multivibrator 33 rises to a high level and then the capacitor C2 and the resistor R4 are turned on When a high level signal is not inputted through the input terminal A1 for a predetermined time period by the time constant set by the output terminal A1, the output of the input terminal A1 is reduced to a low level.

Therefore, if the time constant value of the monostable multivibrator 33 is set to T in the fourth (e) Is a signal corresponding to the vertical blanking interval as shown in FIG. 4 (e).

2, reference numeral 23 denotes a horizontal sync separator for separating the horizontal sync signal as shown in FIG. 4 (f) from the signal of FIG. 4 (b) output from the sync separator 21, And a stable multi-vibrator.

Reference numeral 24 denotes a reference clock generator for generating and outputting, for example, 910f _H , which is a 910 frequency division signal of the horizontal synchronization frequency f _H , from the horizontal synchronization signal output from the horizontal synchronization separator 23, And outputs the composite video signal based on the reference clock output from the reference clock generator 24, the vertical blanking signal output from the vertical blanking signal generator 22, and the horizontal synchronization signal output from the horizontal synchronization separator 23, And generates a coding signal for adding the aspect ratio data to the coding period pulse generating unit.

FIG. 5 shows a configuration of the reference clock generator 24 and the coding interval pulse generator 25, which will be described with reference to operation timing charts shown in FIG. 6 and FIG.

5, the reference clock generating unit 24 compares the phase difference between the horizontal synchronizing signal F and the frequency signal applied in the frequency divider 244 to be described later (1/910), and outputs the voltage signal corresponding to the phase difference A voltage controlled oscillator 242 for outputting a predetermined frequency signal in accordance with the voltage signal output from the PLL circuit 241, a voltage controlled oscillator 242 for outputting a predetermined frequency signal from the voltage controlled oscillator 242, A clock buffer 243 for buffering an output frequency signal and a frequency divider 244 for frequency-dividing the frequency signal output from the clock buffer 243 by 1/910.

That is, in the above configuration, the voltage signal corresponding to the phase difference between the output signal of the (1/910) divider 244 and the horizontal synchronizing signal is applied to the voltage-controlled oscillator 242 so that the output frequency of the voltage- And the output frequency signal of the voltage controlled oscillator 242 is divided through the (1/910) frequency divider 244 and input to the PLL circuit 241 again.

Thus, when the frequency of the horizontal synchronizing signal is 15.734 KHz, the frequency of the signal output from the voltage-controlled oscillator 242 is 14.318 MHz (910 x 15.734 KHz), and this frequency signal is outputted as a reference clock.

The coding interval pulse generating unit 25 includes an inverter IV1 for inverting the vertical blanking signal E applied from the vertical blanking signal generating unit 22 and an inverter IV1 for inverting the output H of the inverter IV1 A first counter 251 for counting the horizontal synchronous signal F as a set signal and outputting a high level signal when the count value reaches a predetermined value, for example, 6, and a high level signal from the first counter 251 Second and third counters 252 and 253 for counting a predetermined count value based on the reference clock G output from the reference clock generator 24 when the first counter 252 is applied, And an AND gate (AND2) for ANDing the inverted output of the third counter (253) and outputting it.

6, when the output H of the inverter IV1 becomes a high level, the first counter 251 performs the counting operation at the rising edge of the horizontal synchronizing signal F, 6, that is, when the horizontal scanning period is 12H, a high level signal is output. The high level output is maintained until the output H of the inverter IV1 becomes low level and the reset signal is input.

When the output I of the first counter 251 rises to a high level, the second counter 252 counts the number of reference clocks G corresponding to the T1 period of FIG. 7 as its initial value Down counting is performed at the rising edge of the reference clock, and when the count value becomes 0, the detection signal of the high level is output. When the output (I) of the first counter 251 rises to a high level, the third counter 253 counts the number of the reference clock G corresponding to the T2 period of FIG. 7 as its initial value Down counting is performed at the rising edge of the reference clock, and when the counted value becomes 0, the detection signal of the high level is output. The second and third counters 252 and 253 are cleared when the output (I) of the first counter 251 becomes low level, and perform the counting operation again.

Then, the output of the second counter 252 and the inverted output of the third counter 253 are logically multiplied by the AND gate AND2 so that in the AND gate AND2, the horizontal scanning period of 12H as shown in (L) Is output.

In FIG. 2, reference numeral 26 denotes a data generator for generating predetermined aspect ratio data to be added to the composite video signal according to the control data (DATA1, DATA2).

8 shows a configuration of the data generator 26. The data generator 26 includes first and second counters 24 and 25 for down-counting a predetermined count value based on a reference clock G output from the reference clock generator 24, A first AND gate AND5 for ANDing the output of the first counter 261 and the first control data DATA1 externally applied to the first counter 261 and the second counter 262, A second AND gate AND6 for ANDing the second control data DATA2 applied externally and outputting the first control data DATA2 and an OR gate OR1 for outputting the outputs of the first and second AND gates AND5 and AND6, ).

In FIG. 7, IV11 to IV14 are inverters for delaying the respective outputs of the first and second counters 261 and 262 applied to the AND gates AND3 and AND4 for a predetermined time.

Here, the first counter 261 performs down counting on the rising edge of the reference clock with the number of the reference clock G corresponding to the T3 section of FIG. 9 as its initial value, and when the count value is 0, Level detection signal. The second counter 262 counts down the count of the reference clock G at the rising edge of the reference clock with the number of the reference clock G corresponding to the T4 section of FIG. 9 as its initial value, Level detection signal. The first and second counters 261 and 262 are cleared by the logical product signal of the inverted signal of the output signal and the horizontal synchronous signal F and perform the counting operation again. A pulse signal having a predetermined pulse width as shown in FIGS. 9 (M) and 9 (N) is outputted from the OR gate OR1, so that if the control data (DATA1, DATA2) Is output as a pulse signal as shown in (O) of FIG.

Here, the width of the pulse signal is set to a width corresponding to the delay time of inverters IV11 and IV12 (IV13 and IV14) and AND gate AND3 (AND4), respectively.

In FIG. 3, reference symbol AND1 denotes an AND gate for logically multiplying the pulse signal output from the coding period pulse generator 25 and the data bit output from the data generator 26, and 37 denotes an AND gate, (L) of the coded interval pulse generator 25 and the data generator 26, which are outputted from the above-mentioned coding interval pulse generator 25, to the composite video signal, (P) of the ninth figure is output and the output of the AND gate AND1 is added to the composite video signal through the adder 27 so that the output from the adder 27 Becomes a signal to which the aspect ratio data like (Q) in FIG. 9 is added.

The composite video signal output from the adder 27 is modulated by the modulator 28 and then transmitted to the airwave transmission network through the antenna 29. [

That is, in the aspect ratio data adding device of the broadcasting system having the above-described configuration, the horizontal synchronizing signal is separated from the composite video signal, and then, based on the horizontal synchronizing signal, a frequency corresponding to N times (910 times in the above example) Thereby generating a reference clock signal.

A method of generating a coding period pulse of a horizontal synchronizing pulse for adding the aspect ratio data by counting the horizontal synchronizing signal based on the vertical blanking signal and for counting the reference clock using the horizontal synchronizing pulse as a reference A pulse signal corresponding to a predetermined position of the horizontal sync pulse is generated and then the synthesized image signal is selectively added to the composite video signal using the control data to transmit the aspect ratio data.

Here, the aspect ratio data can be set as shown in the following Table 1, for example.

The above-described data can be easily set by selectively setting the control data (DATA1, DATA2) applied to the data generator 26 to 1 or 0 in FIG.

Therefore, according to the aspect ratio data adding device of the broadcasting system described above, the aspect ratio data can be added to the broadcast signal and transmitted with a relatively simple configuration.

FIG. 10 is a configuration diagram illustrating an aspect ratio data detecting apparatus for detecting the aspect ratio data from the composite video signal to which the aspect ratio data is added according to the above-described method.

10, reference numeral 101 denotes a synchronization separator for separating a synchronous signal as shown in FIG. 4 (b) from the detected composite video signal. Reference numeral 102 denotes a synchronous separator for separating a synchronous signal B And a vertical blanking signal generator 103 for generating a vertical blanking signal E corresponding to the horizontal synchronization pulse period of the vertical blanking interval from the synchronization signal output from the synchronization separator 101, A horizontal synchronizing signal separating unit 104 for separating and outputting the signal F and a horizontal synchronizing signal dividing unit 102 for dividing the horizontal synchronizing signal F outputted from the horizontal synchronizing signal dividing unit 103, And a reference clock generator 105 for generating a frequency signal corresponding to the horizontal blanking signal E and a reference clock G based on the vertical blanking signal E and the horizontal synchronizing signal F and the reference clock G, Corresponding to the aspect ratio data signal section A pulse generating section for generating a pulse signal L. These circuit sections are substantially the same as the circuit configuration and operation of the configuration shown in FIG.

10, reference numeral 106 denotes a first switching unit which is turned on when the pulse signal L output from the coding period pulse generating unit 105 becomes a high level, reference numeral 107 denotes a reference clock generating unit 104, And the D input is coupled to the composite video signal A through the first switching unit 106. The D flip-flop is a D flip-flop.

As shown in FIG. 11, the coding period pulse generator 105 outputs a high-level signal L corresponding to an aspect ratio data addition period of the input composite video signal A, When the pulse signal L becomes a high level, the first switching unit 106 is turned on, so that the composite video signal corresponding to the input D of the D flip-flop 107 is applied.

On the other hand, the D flip-flop 107 receives the output G of the reference clock generator 104 as its input clock. Accordingly, the D flip- The aspect ratio data added to the composite video signal is detected and output.

That is, in the above configuration, the sync signal is separated from the composite video signal, and a reference clock signal having a frequency corresponding to N times (910 times in the above example) of the horizontal sync signal is generated.

A pulse signal corresponding to an aspect ratio data addition section of the composite video signal is generated by counting the horizontal synchronization signal based on the vertical blanking signal and counting the reference clock with reference to the horizontal synchronization pulse , And performs data bit detection on the composite video signal during the section corresponding to the pulse signal, thereby detecting the aspect ratio data transmitted from the transmitting side.

FIG. 12 shows a case in which the aspect ratio data detecting apparatus described above is applied to a television receiver, which automatically sets an aspect ratio of an image screen outputted on the CRT according to the aspect ratio data transmitted from the broadcasting station.

In FIG. 12, reference numeral 121 denotes an antenna for receiving a frequency signal transmitted from a broadcasting station, reference numeral 122 denotes a tuner for tuning a predetermined broadcast frequency from a frequency signal input through the antenna 121, reference numeral 123 denotes a tuner (IF) amplifier 124 for amplifying the intermediate frequency signal IF outputted from the IF amplifier 122 and an IF intermediate frequency signal PIF from the IF signal outputted from the IF amplifier 123 It is a separating P / S separator.

Reference numeral 125 denotes an image detector for detecting the image intermediate frequency (PIF) signal to output a composite image signal. Reference numeral 126 denotes an image detector for processing the composite image signal output from the image detector 125, And an image processor 127 for outputting R, G and B signals corresponding to the red, green and blue signals corresponding to the RGB signals, And generates a corresponding image screen.

The CRT includes a horizontal deflection coil 128 for deflecting the electron beam emitted from the cathode electrode (not shown) in the horizontal direction corresponding to the deflection signal to be described later, and a vertical deflection coil 129 for deflecting the electron beam in the vertical direction .

In FIG. 12, reference numeral 130 denotes a horizontal driving pulse and a vertical driving signal, which are based on the horizontal and vertical synchronizing signals output from the image processing unit 126 and the deflection data set by the control unit 136 to be described later. A horizontal deflection unit 131 for driving the horizontal deflection coil 128 on the basis of a horizontal driving pulse output from the deflection control unit 130 and 132 a horizontal deflection unit for driving the horizontal deflection coil 128, And a vertical deflection unit for driving the vertical deflection coil 129 based on the vertical driving pulse.

Reference numeral 133 denotes an aspect ratio data detection unit for detecting the aspect ratio data from the composite video signal output from the video signal detector 125 as described above. Reference numeral 134 denotes an aspect ratio data detection unit for detecting the aspect ratio data required for the deflection control of the deflection control unit 130 A deflection data storage 135 for storing deflection data corresponding to an aspect ratio of a plurality of deflection data, that is, an image screen to be output on the CRT; 135, a detection data storage for storing data detected by the aspect ratio data detector 133; Wealth.

Reference numeral 136 denotes a unit for reading predetermined deflection data from the deflection data storage unit 134 according to data detected by the aspect ratio data detection unit 133 and then resetting the deflection control unit 130 based on the deflection data Thereby adjusting an aspect ratio of an image screen output onto the CRT to a form suitable for a broadcast signal.

That is, in the above configuration, when the aspect ratio data added to the composite video signal is detected by the video detector 133 and applied to the controller 136, the controller 136 firstly outputs the detected data bit to the detection data storage 135 ) With the detection data stored in the storage unit. If the two data do not coincide with each other as a result of the comparison, the deflection data corresponding to the bit data is read out from the deflection data storage unit 134, and the deflection control unit 130 is reset based thereon, The data stored in the storage unit 135 is updated and registered as new detection data.

Therefore, according to the embodiment, the aspect ratio of the image screen output to the CRT is automatically adjusted according to the type of the broadcast program, thereby greatly improving the convenience of the viewer.

The present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the technical scope of the present invention.

That is, for example, in the above-described embodiment, the case where the aspect ratio data is added to the 12H horizontal sync pulse has been described, but the present invention is not limited to the specific horizontal sync pulse and is generally used for teletext broadcast or caption broadcast It is possible to transmit and receive the aspect ratio data using another horizontal synchronizing pulse.

As described above, according to the present invention, aspect ratio data is added to a specific horizontal synchronization pulse in the vertical blanking interval of a broadcast signal, so that the aspect ratio of the video image reproduced and output by the television receiver is automatically adjusted It is possible to realize an automatic adjustment system of the aspect ratio of the television receiver.

Claims (6)

A horizontal blanking signal generating means for generating a vertical blanking signal from the composite video signal, a vertical blanking signal generating means for generating a vertical blanking signal based on the horizontal synchronizing signal, a frequency corresponding to an integral multiple of the horizontal synchronizing signal, A coding interval pulse means for generating a coding pulse corresponding to a predetermined vertical synchronization pulse interval of the vertical blanking interval based on the vertical blanking signal, the horizontal synchronization signal and the reference clock, And outputs each detection signal when the counted value is a first value and a second value that is larger than the first value and outputs the first detection signal and the first data signal from the outside to a first logical multiplication block, And a second logical product output signal by performing a second logical multiplication of the second data signal from the outside and thereby performing a logical AND of the first logical product signal and the second logical product output signal, And a data adding means for adding the aspect ratio data generated by the data generating means to the composite video signal based on the coding period pulse. . The apparatus according to claim 1, wherein the coding interval pulse generating means comprises: a first counter for generating a pulse signal corresponding to a predetermined horizontal synchronization pulse in a vertical blanking interval by counting a horizontal synchronization signal based on a vertical blanking signal; A second counter for outputting a first detection signal indicating a start point of a coding period with respect to a horizontal synchronizing pulse selected by the counter; A third counter for outputting a signal and a first logical AND means for logically multiplying the outputs of the first and second counters. A vertical blanking signal generating means for generating a vertical blanking signal from the composite video signal, a reference clock generating means for generating a reference clock having a predetermined frequency based on the horizontal synchronizing signal, A coding period pulse generating means for generating a period pulse corresponding to a horizontal synchronizing pulse period in which aspect ratio data is added based on the vertical blanking signal, the horizontal synchronizing signal, and the reference clock, And a data detection unit for detecting a data bit from the composite video signal input by the switching unit. The apparatus of claim 1, wherein the composite video signal is a video signal. The apparatus of claim 3, wherein the coding period pulse generating means comprises: a first counter for generating a pulse signal corresponding to a predetermined horizontal synchronizing pulse of a vertical blanking interval by counting a horizontal synchronizing signal based on a vertical blanking signal; A second counter for outputting a first detection signal indicating a start point of a coding period for a horizontal synchronization pulse selected by the counter, a second counter for outputting a first detection signal indicating a start point of a coding period, And a first logical AND means for logically multiplying the outputs of the first and second counters. The apparatus as claimed in claim 3, wherein the data detecting means comprises a D flip-flop whose D input is coupled to the output of the switching unit and operates according to the reference clock. A broadcast system in which aspect ratio data is added to a predetermined horizontal synchronization pulse in a vertical blanking interval of a composite video signal to generate a reference clock based on a horizontal synchronization signal and a vertical blanking signal separated from a composite video signal, Data detection means for detecting the aspect ratio data from the composite video signal by selectively inputting the composite video signal of the vertical synchronization pulse section in which the aspect ratio data is added based on the horizontal synchronization signal, the vertical blanking signal and the reference clock, A deflection data storage means in which a plurality of deflection data corresponding to an aspect ratio of a video signal to be defrosted is stored and a deflection data storage means for reading the deflection data stored in the deflection data storage means based on the detection data outputted by the aspect ratio data detection means, A control means for performing a deflection control on a video signal output to the video camera The aspect ratio auto-adjustment system of the television receiver, characterized in that configured.