KR0176852B1 - 4:3 screen display apparatus of broadcasting receiver - Google Patents

Abstract

The present invention relates to a technology for providing a 16: 9 screen or 4: 3 screen by controlling the deflection of the display means. In the conventional satellite broadcasting receiver, a 16: 9 screen video signal is displayed on a 4: 3 screen. Although it has been proposed for the digital editing and processing technology, the system is not only difficult to modify, but also the cost has been increased so that the user is burdened. In order to solve this problem, the present invention is supplied with panning information. : Panning information decoder 46 for detecting and detecting the 9-screen deflection data and the 4: 3 screen deflection data, and the 4: 3 screen deflection data and the screen size information and position so as to be suitable for the 4: 3 receiver. 4: 3 picture deflection adjustment unit 47 for reconstructing information, and vertical and horizontal synchronization signals V _sync and H _sync supplied from the video decoder 45 and 4: 3 supplied from the switch 48. In addition Deflection of 16: 9 screen or 4: 3 screen is controlled by deflection control unit 49 which deflects vertical and horizontal coils of the water pipe (CPT) to match the resolution scanning on the transmitter side using 16: 9 deflection data. It was made.

Description

4: 3 screen display device of broadcast receiver

1 is a block diagram of a general satellite broadcasting receiver.

2 is an explanatory diagram of panning information embedded in a 16: 9 picture broadcast signal.

3A illustrates a normal display of 16: 9.

(b) shows an example in which a broadcast signal for a 16: 9 screen is incorrectly displayed on a 4: 3 screen.

4 is a block diagram of a 4: 3 screen display apparatus of the present invention.

5 is a block diagram of deflection correction coefficient calculation according to the present invention.

6 is an explanatory diagram of center coordinates of a 16: 9 screen and a 4: 3 screen by panning information.

7 (a) and 7 (b) are explanatory diagrams of the principle of deflection adjustment according to the present invention;

8 is an exemplary block diagram of a vertical deflection control circuit applied to the deflection control unit of FIG.

FIG. 9 is a circuit diagram illustrating an example of a vertical oscillation unit in FIG. 8.

(A)-(d) of FIG. 10 is a waveform diagram of each part of FIG.

FIG. 11 is an exemplary block diagram of a vertical position adjusting circuit applied to the vertical oscillator of FIG.

12 is an exemplary block diagram of a horizontal deflection circuit applied to the deflection control unit of FIG.

FIG. 13 is a block diagram of one embodiment of a horizontal oscillator of FIG. 12; FIG.

14 is an exemplary circuit diagram of a horizontal oscillator in FIG.

15 is a waveform diagram showing the principle of generating the AFC oscillation pulse according to the present invention,

(a) is a waveform diagram of a synchronization signal.

(b) is a waveform diagram of the comparison pulse.

(c) is a waveform diagram of a horizontal oscillation pulse.

16 is a horizontal size adjustment circuit applied to the deflection control unit of FIG.

17 is a horizontal position adjustment circuit applied to the deflection control unit of FIG.

* Explanation of symbols for main parts of the drawings

41: channel portion 42: system decoder

43: audio decoder 44: speaker

45: video decoder 46: panning information decoder

47: 4: 3 screen deflection adjustment unit 48: switch

49: deflection control unit CPT: water pipe

The present invention relates to a technology for providing a 16: 9 screen or a 4: 3 screen by controlling the deflection of the display means. Particularly, when a 4: 3 screen display device receives a 16: 9 screen broadcast signal, Regarding the 4: 3 screen display apparatus of a broadcast receiver adapted to display 4: 3 screen without damage by using panning information embedded in a screen broadcast signal and a deflection device of a 4: 3 television receiver. will be.

FIG. 1 is a block diagram of a general satellite broadcasting receiver. As shown in FIG. 1, a channel unit which receives a satellite broadcasting signal received through an antenna, removes data errors and noise generated during transmission, and restores original data. (11) and a system decoder 12 for demultiplexing the signal output from the channel unit 11 to detect data corresponding to one TV channel or data channel, and a compressed signal from the system decoder 12. Red, green, and blue signals (R), (G), (B), composite video signals (CVS), and luminance / color signals obtained by restoring the video data inputted in the form and processing them in a format suitable for the corresponding broadcasting method. The video decoder 13 outputting the Y / C to the display device 15 and the audio data input from the system decoder 12 in the compressed form are restored to the speaker SP _L and SP _R. Audi To consist of decoder 14, is described by the function thereof, see FIG. 2 and FIG. 3 as follows.

The broadcast signal emitted from the satellite is received through a small dish antenna and then input to the channel unit 11 of the satellite broadcast receiver through a low noise block down converter (LNB) to remove data errors and noise generated in the transmission process. In addition, the data initially transmitted by the transmitter is restored through a series of processes.

In the transmission data output from the channel unit 11, data of multiple channels are multiplexed in a time division manner. The data is demultiplexed by the system decoder 12 to output data corresponding to one TV channel or data channel. do. If the output data is TV channel data, it is divided into video data and audio data, respectively, and transmitted to the video decoder 13 and the audio decoder 14, respectively.

The audio decoder 14 restores the audio data input in the compressed form and outputs the analog audio signals L and R to the speakers SP _L and SP _R to reproduce the original audio signal. Is output.

In addition, the video decoder 13 restores the video data input in a compressed form and processes the video data into a format suitable for the broadcasting method (NTSC, PAL, etc.), and the red, green, and blue signals (R) and (G). (B), the composite video signal (CVS) and the luminance / color signal (Y / C) are outputted to the display device 15, and the display device 15 outputs a deflection circuit and a water pipe driving circuit according to the input signal. Is driven to display the corresponding broadcast program.

FIG. 2 is a diagram illustrating panning information detected through the video decoder 13. As shown in FIG. 2, horizontal and vertical size information and offset information when a 4: 3 screen is displayed in 16: 9 screen size information is illustrated. Will be loaded.

However, when the 16: 9 screen video signal is displayed on a 4: 3 screen without using the panning information, an image normally displayed as shown in FIG. It appears in a distorted form as shown in (b) of FIG.

In the conventional satellite broadcasting receiver, a technology for digitally editing and processing a 16: 9 screen video signal to display on a 4: 3 screen has been proposed, but the system is difficult to implement and the cost is considerably increased. It has emerged as a bug that burdens me.

Accordingly, an object of the present invention is to detect panning information inserted in a broadcast signal for a 16: 9 screen in a DBS system and generate an analog deflection control signal based on the panning information. The present invention provides a 4: 3 screen 4: 3 device that displays a screen having a desired size by controlling a deflection of a 16: 9 screen or a 4: 3 screen.

FIG. 4 is a temporary block diagram of a 4: 3 screen display apparatus of a broadcast receiver of the present invention for achieving the above object. As shown in FIG. 4, a data error generated in a transmission process by receiving a broadcast signal emitted from a satellite is shown in FIG. And a channel decoder 41 for removing noise components, a system decoder 42 for demultiplexing data output from the channel section 41, and separating audio and video data from data of a predetermined channel, and the system decoder. An audio decoder 43 for restoring audio data output in a compressed form at 42 and converting the audio data into analog audio signals R and L and outputting them to the speaker 44; and the system decoder 42. In addition to receiving the video data output in the compressed form from the original color signal (R), (G), (B) corresponding to the signal standards of each broadcast method, and outputs to the water pipe (CPT) side, A video decoder 45 for detecting vertical and horizontal sync signals (V _sync ), (H _sync ), and panning information, and the panning information is supplied to separate 16: 9 picture deflection data and 4: 3 picture deflection data. A panning information decoder 46 for detecting, the 4: 3 screen deflection adjustment unit 47 for receiving the 4: 3 screen deflection data and reconstructing it into screen size information and position information so as to be suitable for a 4: 3 receiver; A switch 48 for selecting and outputting the 16: 9 deflection data or the 4: 3 deflection data according to the switching control signal CS supplied from the vertical and horizontal sync signals V _sync supplied from the video decoder 45. ), (H _sync ) and a deflection control unit for deflecting vertical and horizontal coils of the water pipe (CPT) to match the resolution scanning on the transmission side using 4: 3 or 16: 9 deflection data supplied from the switch 48. (49), attached to the operation and effects of the present invention configured as described above A detailed description with reference to FIGS. 5 to 17 is as follows.

First, referring to FIG. 4, the overall operation of the present invention will be described.

The broadcast signal emitted from the satellite is received through the satellite antenna and then supplied to the channel unit 41 through the converter (LNB) to raise data errors and noise generated during the transmission process, which is inversely generated by the system decoder 42. Multiplexing is performed to separate audio and video data from data of a predetermined channel, and the audio data is supplied to the audio decoder 43, and the video data is supplied to the video decoder 45.

The audio decoder 43 restores audio data input from the system decoder 42 in a compressed form, and then converts the audio data into analog audio signals R and L and outputs them to the speaker 44.

In addition, the video decoder 45 restores the video data input from the system decoder 42 in a compressed form, and then processes the video data according to the signal standard of each broadcasting method through an encoder, thereby generating the original color signal R, (G) and (B) are output to the water pipe (CPT) side, and on the other hand, the vertical and horizontal synchronization signals (V _sync ) and (H _sync ) are separated and output to the deflection control unit 49, and the screen size The related data is separated and output to the panning information decoder 46 side.

Accordingly, the panning information decoder 46 receives the panning data and separately detects the 16: 9 screen deflection data and the 4: 3 screen deflection data so that the 16: 9 screen deflection data is one side of the switch 48. Output to the fixed terminal (b), the 4: 3 screen deflection data is supplied to the 4: 3 screen deflection adjustment unit 47 and reconstructed into screen size information and position information so as to be suitable for the 4: 3 water pipe, and then the switch ( Supplied to the other fixed terminal (c).

In addition, the switch 48 selects and outputs the 16: 9 deflection data or the 4: 3 deflection data according to the switching control signal CS supplied from the outside. In the 4: 3 screen mode, the 4: 3 deflection is selected. Data is selected and transferred to the deflection control unit 49.

Accordingly, the deflection control unit 49 is a vertical, horizontal synchronization signal (V _sync ), (H _sync ) supplied from the video decoder 45 and 4: 3 or 16: 9 deflection data supplied from the switch 48. Since the vertical and horizontal coils of the water pipe (CPT) are deflected so as to match the resolution scanning on the transmitting side, the 4: 3 screen is normally displayed on the water pipe (CPT).

First, the operation of the panning information decoder 46 will be described in more detail with reference to FIG. 5. The video decoder 45 receives the compressed image data from the system decoder 42 and receives a picture tube (CPT) for screen scanning. ), Red, green, and blue color signals (R), (G), and (B) are output, and on the other hand, the panning information related to the size of the screen is decoded and output to the panning information analysis unit 51. The panning information analyzing unit 51 analyzes the decoded panning information and outputs horizontal panning information hp and vertical panning information vp.

In addition, the horizontal deflection correction coefficient calculating unit 52 receives the horizontal panning information hp, calculates position information P ₁ (P: Phase) and size information S ₁ related to the horizontal deflection, and vertical deflection. The correction coefficient calculator 53 receives the vertical panning information vp and calculates the position information P ₂ and the size information S ₂ related to the vertical deflection, and these are obtained through the D / A converter 54. Analog horizontal position information HP, horizontal size information HS, vertical position information VP, and vertical size information VS are converted and output.

FIG. 6 shows an example of data transmission related to the size of a screen inserted and transmitted in a DBS broadcast signal, and includes information related to a 4: 3 screen, including horizontal, vertical size, and center offset coordinates of a 16: 9 screen. Data and the like. In the present invention, 4: 3 horizontal size information (HS) and vertical size information (VS) are analyzed to adjust the amplitude of a 4: 3 screen, and horizontal and vertical positions using horizontal and vertical offset coordinates. To control.

Basically, the synchronization signal of 16: 9 screen is used as it is, and the exact position information is found and displayed while adjusting the horizontal and vertical size, and the overscan area is indicated by deflection using the 16: 9 synchronization signal. That is, deflection is performed using a 16: 9 synchronization signal and 4: 3 screen is displayed using overscan.

On the other hand, (a) of FIG. 7 shows the principle of deflection adjustment according to the present invention, where 71 is a waveform diagram of a 16: 9 synchronization signal used as a basic signal of deflection, 72 is a 16: 9 screen, and 73 Is a 4: 3 screen. In addition, 74 is a sawtooth pulse used for scanning once in the horizontal or vertical direction on a 16: 9 screen, and 75 is a sawtooth pulse used for scanning once in the horizontal or vertical direction on a 4: 3 screen.

When the 4: 3 screen is to be displayed without damage using a 16: 9 synchronization signal, the sawtooth pulse 74 must be converted to the sawtooth pulse 75. In other words, the period and amplitude of the sawtooth pulse are converted to be suitable for a 4: 3 screen. At this time, an overscan area 76 is generated, but this area 76 is an invisible area on the 4: 3 screen. Does not become.

(B) of FIG. 7 extracts information about a 4: 3 screen from among 16: 9 screen information and adjusts an amplitude for size adjustment when displaying a 4: 3 screen, and adjusts the position as described above. The principle of adjusting the center DC value is shown.

8 is a block diagram showing an embodiment of a vertical deflection coil driving circuit applied to the deflection control unit 49 of FIG. 4, and the operation thereof will be described below.

The vertical oscillation unit 81 generates a sawtooth wave voltage for changing the vertical size of the 4: 3 screen using the vertical size information VS, and the vertical oscillation frequency of the transmitting side based on the vertical synchronization signal V _sync . To match frequency and phase. In addition, in order to operate the deflection control unit 49 in a more stable state, the vertical driving unit 82 forms an oscillation output of the vertical oscillation unit 81 and amplifies and outputs the oscillation to a predetermined level. The vertical position is adjusted based on the vertical position information VP while supplying the sawtooth wave current output from the vertical driver 82 to the vertical deflection coil DYV of the water pipe CPT.

Meanwhile, the vertical size and position control process of the screen by the vertical oscillator 81 will be described in more detail with reference to FIGS. 9 to 11 as follows.

First, as shown in FIG. 9, the waveform as shown in FIG. 10 (b) fed back from the vertical output unit 83 is integrated through the resistor R2 and the capacitor C2 after passing through the capacitor C1. The sawtooth wave waveform is superimposed on the sawtooth wave vertical oscillation signal OSC _{V as} shown in FIG.

That is, when a sawtooth wave with distortion as shown in FIG. 10A is supplied, the waveform as shown in FIG. 10B output from the vertical output unit 83 is integrated by the resistor R2 and the capacitor C2. After converting into a parabolic waveform as shown in FIG. 10 (c) and overlapping with the sawtooth wave, a sawtooth wave having good linearity as shown in FIG. 10 (d) can be obtained. Here, the vertical size can be adjusted by adjusting the variable resistor VR according to the vertical size information VS to change the magnitude of the sawtooth wave current supplied to the base of the transistor Q2.

In addition, as shown in FIG. 11, a direct current is supplied to the vertical deflection coil DYV using the vertical output V _out , and the power terminal voltage B ⁺ is changed using the vertical position information VP to display the screen. The vertical position of can be adjusted.

FIG. 12 is a block diagram showing an embodiment of a horizontal deflection coil driving circuit applied to the deflection control unit 49 of FIG. 4.

The pulse generated by the AFC (Auto Frequency Control) horizontal oscillator 121 is normalized in the horizontal driver 122 and amplified to a predetermined level, and then amplified to a sufficient level through the horizontal output unit 123 so that the sawtooth wave current It is supplied to the horizontal deflection coil (DYH) of the water pipe (CPT).

The oscillation frequency and phase there is controlled to match the horizontal synchronizing signal (H _sync), the horizontal synchronous signal (H _sync) is a horizontal sync by noise because it contains high frequency components compared with the vertical synchronizing signal (V _sync) May shift. In view of this, the AFC circuit is adopted in the horizontal oscillator 121, the horizontal size is adjusted in such a manner as to control the horizontal output unit 123 using the horizontal size information HS, and the horizontal position information HP is used. To adjust the horizontal position.

FIG. 13 is a detailed block diagram showing an embodiment of the horizontal oscillator 121 in FIG. 12. The operation thereof will be described below.

The AFC horizontal pulse adjusting unit 131 compares the feedback flyback pulse FB with the horizontal position information HP to generate a horizontal pulse, and this signal is generated by the resistors R31, capacitors C31, and C32. It is integrated and supplied to the AFC circuit 132. Accordingly, the AFC circuit 132 compares the phase of the integrated signal and the horizontal synchronization signal II _SYNC and outputs a detection signal in the comparison result, which is represented in the form of voltage through the integration circuit 133.

In addition, the low pass filter 134 removes a high frequency component among the output components of the integrating circuit 1 (33) and supplies only a signal having a low frequency component to the horizontal oscillator 135. A description with reference to FIG. 15 is as follows.

The horizontal pulse H is integrated by the resistor R41 and the condenser C41 to form a sawtooth pulse and is supplied to the base side of the transistor Q42 constituting the differential amplifier together with the transistor Q41. The transistor Q42 The reference bias voltage (V _ref ) is supplied to the base of), the horizontal sync signal (H _sync ) is supplied to the base of the transistor (Q44), and the differential amplifier is turned on and off.

When the differential amplifier is turned on, a current equal to the amount of current flowing through the diode D41 and the transistor Q41 flows through the transistor Q43, and according to the phase of the comparison pulse as shown in FIG. The positive and negative sections of the output current are determined, and the generated current is smoothed through the low pass filter 134 through the low pass filter 134 and then the horizontal oscillator 135 is controlled.

On the other hand, FIG. 16 shows an embodiment of a horizontal size adjusting circuit applied to the 4: 3 screen deflection adjusting unit 47 of FIG. 4. As shown therein, the horizontal size information HS is controlled to switch the switch SW61. It is used as a signal to change the high pressure generated in the horizontal deflection coil (DYH) by changing the combined capacitance of the resonant capacitor (C61), (C62), thereby changing the deflection sensitivity of the water pipe (CPT) The horizontal size of was changed.

Meanwhile, FIG. 17 illustrates an embodiment of a horizontal position adjusting circuit applied to the 4: 3 screen deflection adjusting unit of FIG. 4. As shown in FIG. 17, the power supply terminal voltage B ^{+ is} connected to the horizontal driving transformer T71. Change the position of the center of deflection by changing the resistance value of the variable resistor VR71 using the horizontal position information HP while supplying a DC current to the horizontal deflection coil DYH to match the center of deflection with the center of the screen. Let's go.

As described in detail above, the present invention detects panning information inserted in a broadcast signal for a 16: 9 screen in a DBS system, and detects an analog deflection control signal based on the panning information. After the generation, the display device can be implemented at low price when the 16: 9 screen or 4: 3 screen is implemented by controlling the deflection of the 16: 9 screen or the 4: 3 screen.

Claims (5)

It receives the video data output in compressed form from the system decoder 42 for satellite broadcasting reception and restores the original color signals (R), (G), and (B) corresponding to the signal standards of each broadcasting system. A video decoder 45 which outputs to the (CPT) side and detects vertical and horizontal sync signals (V _sync ), (H _sync ) and panning information, and receives panning information and receives 16: 9 screen deflection data and Panning information decoder 46 for separately detecting 4: 3 picture deflection data and 4: 3 picture reconstructing 4: 3 picture deflection data and reconstructing 4: 3 picture deflection data into picture size information and position information so as to be suitable for a 4: 3 picture pipe. Supplied from the video decoder 45 and the switch 48 for selecting and outputting the 16: 9 deflection data or the 4: 3 deflection data according to the screen deflection adjustment unit 47 and the switching control signal CS supplied from the outside. Vertical and horizontal synchronization signals (V _sync ), (H _sync ) and supplied from the switch 48 And a deflection control unit (49) for deflecting vertical and horizontal coils of the water pipe (CPT) so as to match the resolution scanning on the transmitting side using 4: 3 or 16: 9 deflection data. 4: 3 screen display. 4. The 4: 3 screen deflection adjustment unit 47 changes the combined capacitance of the resonant capacitors C61 and C62 with the horizontal size information HS so that the horizontal size of the screen is adjusted. 4: 3 screen display device of a broadcast receiver comprising a. 4. The 4: 3 screen deflection adjustment unit 47 changes the resistance value of the variable resistor VR71 with the horizontal position information HP so as to change the output DC voltage level of the horizontal deflection coil DYH. A 4: 3 screen display apparatus for a broadcast receiver comprising a horizontal position adjusting circuit for adjusting a center position. The vertical oscillator of claim 1, wherein the deflection control unit 49 generates a sawtooth wave voltage whose frequency and phase are synchronized with the vertical oscillation frequency of the transmitting side by using the vertical size information VS and the vertical synchronization signal _Vsync . 81), the vertical driving unit 82 for shaping the oscillation output of the vertical oscillating unit 81 and amplifying the oscillating output to a predetermined level, and the sawtooth current output from the vertical driving unit 82 of the water pipe CPT. 4: 3 screen of a broadcast receiver comprising a vertical deflection control circuit and a vertical output unit 83 for adjusting the vertical position based on the vertical position information VP while supplying the vertical deflection coil DYV. Display device. The method of claim 1, wherein the horizontal oscillation unit 121 generates a horizontal oscillation signal by using the horizontal synchronization signal H _sync and the horizontal position information HP, and amplifies the horizontal oscillation output to a predetermined level. The horizontal drive unit 122 and the output of the horizontal drive unit 122 is amplified to a sufficient level, the sawtooth current of the level according to the horizontal output unit 123 is supplied to the horizontal deflection coil (DYH) of the water pipe (CPT) A 4: 3 screen display apparatus for a broadcast receiver comprising a horizontal deflection control circuit configured.