KR19980017761A - Subscreen 16: 9 screen size processing unit for multi-screen televisions - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sub-screen 16: 9 screen size processing apparatus of a multi-screen television, wherein the screen is reproduced as a main / sub picture by the execution of the PIP function, and a multi-screen is reproduced as main / sub-audio. In the television, function setting means (32) for setting a function for horizontally expanding the sub-screen to a 16: 9 screen size when the sub-picture is reproduced in a 16: 9 mode composite video signal according to the execution of the PIP function, the mode switch The main image processing means 20 for processing the main composite video signal, which is the target of the main picture reproduction, through the unit 18, and the synchronization signal (H SYNC / V SYNC) included in the main composite video signal is separated and separated. A first clock signal CLK1 in 4: 3 mode and a second clock signal CLK2 in 16: 9 mode based on the extracted synchronization extracting means 22 and the extracted synchronization signal H SYNC / V SYNC. ) Is a clock converting means for selectively generating, the clock converting means The sampling period is changed by the first clock signal CLK1 or the second clock signal CLK2 selectively generated from the control unit, and thus the sub-complex video signal from the mode switch unit 18 is displayed in a 16: 9 screen by time compression operation. Image data converting means 46 for converting the digital data into a size or 4: 3 screen size, and selectively receiving the first clock signal CLK1 or the second clock signal CLK2 to record the sub-compound image data; In addition, the image data storage means 50 receives the read clock signal from the PLL circuit 48, and compresses and reads the recorded sub-complex image data in image line units, and reads from the image data storage means 50. Image data inverse conversion means (52) for converting the sub-compound image data into analog signal form, and sub-compositing through the main image signal from the main image processing means (20) and the image data inverse conversion means (52). Signal multiplexing means 26 for multiplexing and outputting the signal as a main / sub-complex video signal, and blanking signal BLK having a 16: 9 screen size or 4: 3 screen size selectively generated by the signal multiplexing means 26 The second clock signal CLK2 from the clock converting means is selectively generated in accordance with a blanking signal generating means 28 and a function for the 16: 9 picture size horizontal direction from the function setting means 32. In addition, it characterized in that it comprises a control means 34 for controlling the blanking signal having a 16: 9 screen size is generated from the blanking signal generating means 28.

Description

Subscreen 16: 9 screen size processing unit for multi-screen televisions

The present invention relates to a sub-screen 16: 9 screen size processing apparatus of a multi-screen television, and more particularly, to a 16: 9 mode in a multi-screen television having a picture in picture (PIP) function to reproduce a sub-screen on a main screen. A sub-screen 16: 9 screen size processing apparatus for a multi-screen television for reproducing the sub-screen by 16: 9 when the composite video signal having the sub-picture is reproduced.

Conventionally, in a conventional television which selects and reproduces a predetermined broadcast channel among a plurality of television broadcast signals, one broadcast channel is tuned through a single tuner so that only the image corresponding to the broadcast channel is reproduced on the main screen. Therefore, in order to reproduce the broadcast video of the other channel in the state of playing the broadcast video of one channel, there is a disadvantage in that it is not possible to play the broadcast video of one channel being reproduced.

In order to solve the above disadvantages, a plurality of sub-screens are currently provided so that a plurality of sub-screens can be simultaneously reproduced on a main screen having a 4: 3 or 16: 9 screen size by simultaneously tuning a plurality of channels. Since the PIP function is adopted, viewing of the broadcast video of a plurality of channels is possible through the main / sub picture reproduction by the PIP function.

On the other hand, the broadcast video of the sub-screen formed on the main screen according to the PIP function is analog conversion processing by the video compression processing through the digital conversion of the composite video signal of the sub-screen playback and the horizontal scanning line of a predetermined ratio erased As shown in FIG. 1, the sub-screen 4 formed on the main screen 2 having a screen size of 4: 3 or 16: 9 is 4: 3 screen size as shown in FIG. 1. Is playing with the screen.

However, when the sub picture 4 on the main picture 2 according to the PIP function is reproduced, the 4: 3 picture size is used for not only the 4: 3 mode composite video signal but also the 16: 9 mode composite video signal. Since the signal compression is also performed for the composite video signal in the 16: 9 mode in the same manner as the signal compression ratio for the composite video signal in the 4: 3 mode, the sub-picture image reproduced on the screen is longer than the normal screen. There is a problem that is displayed.

Accordingly, the present invention has been made in view of the above circumstances, and a 16: 9 screen horizontal processing is performed on a composite video signal having a 16: 9 mode in a multi-screen television capable of reproducing main / sub picture using a PIP function. An object of the present invention is to provide a sub-screen 16: 9 screen size processing apparatus of a multi-screen television for sub-screen reproduction.

In order to achieve the above object, according to the sub-screen 16: 9 screen size processing apparatus of a multi-screen television according to the present invention, a multi-channel television broadcast signal simultaneously tuned through a plurality of tuners by execution of the PIP function is used for video / The video / audio is detected by the audio IF unit, and the intermediate frequency is amplified. The main / sub composite video signal and the main / sub audio signal are separated by the mode switch unit, and the screen is reproduced as a main / sub picture image. In a multi-screen television for sound reproduction as sub-audio; Function setting means for performing a function setting for horizontally expanding a sub-screen to a 16: 9 screen size when a sub-picture is reproduced in a 16: 9 mode composite video signal according to the execution of the PIP function; a target for main screen reproduction through the mode switch unit Main image processing means for processing a video signal of a main composite video signal, a synchronization extracting means for separating and extracting a synchronous signal included in the main composite video signal, and a method according to 4: 3 mode based on the extracted synchronous signal. Clock compression means for selectively generating the first clock signal and the second clock signal according to the 16: 9 mode, the sampling period is changed by the first clock signal or the second clock signal selectively generated from the clock conversion means to compress the time Video data conversion means for converting the sub-complex video signal from the mode switch unit into digital data having a 16: 9 screen size or 4: 3 screen size by operating the first clock signal. Alternatively, receiving the second clock signal selectively to record the sub-compound image data, and receiving the read clock signal from the PLL circuit to compress and read the recorded sub-compound image data in image line units to store the image data. Means, image data inverse conversion means for converting the sub-compound image data read out from the image data storage means into an analog signal form, a main image signal from the main image processing means, and a sub-compound image signal through the image data inverse conversion means. Signal multiplexing means for multiplexing and outputting as a main / sub-complex video signal, blanking signal generating means for selectively generating a blanking signal having a 16: 9 screen size or a 4: 3 screen size as the signal multiplexing means, and the function setting From the clock converting means in accordance with a function operation for 16: 9 aspect ratio The sub-screen 16: 9 screen of the multi-screen television, comprising a control means for selectively generating a second clock signal and controlling a blanking signal having a 16: 9 screen size to be generated from the blank key signal generating means. Provide a size processing device.

Preferably, in the present invention, the clock converting means receives the synchronous signal, receives a first PLL circuit for generating a first clock signal according to a 4: 3 mode by PLL operation at a predetermined division ratio, and receives the synchronous signal. A second PLL circuit for generating a second clock signal according to 16: 9 mode by PLL operation at a predetermined division ratio, and switching control by the control means to control the first clock signal from the first PLL circuit or the second PLL circuit from the second PLL circuit; It characterized in that it comprises a switching circuit for switching so that the two clock signal is selectively generated.

According to the present invention configured as described above, the composite video signal according to the 16: 9 mode when the main / sub-picture playback for the multi-channel composite video signal in a multi-screen television having a PIP function for the main / sub-picture playback Signal processing in a 16: 9 screen size is performed to form a sub-screen that is 16: 9 sized on the main screen.

1 is a diagram illustrating a state in which a sub-screen formed on a main screen of a conventional general multi-screen television is reproduced with a 4: 3 screen size;

2 is a block diagram showing a sub-screen 16: 9 screen size processing apparatus for a multi-screen television according to the present invention;

3 is a block diagram illustrating a detailed block configuration of the sub-image processor shown in FIG. 2;

4 is a diagram illustrating a state in which the sub-screen on the main screen is horizontally processed to a screen size of 16: 9 according to a preferred embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

10, 12: Tuner 14: Video IF unit,

16: Audio IF section 18: Mode switch section,

20: main image processing unit 22: synchronous extraction unit,

24: sub-image processing unit 26: signal multiplexing unit,

28: blanking signal generator 30: video output unit,

32: function setting section 34: microcomputer,

40, 42, 48: PLL circuit 44: switching circuit,

46: data conversion unit 50: image data storage unit,

52: data inverse converter

Hereinafter, the present invention configured as described above will be described in detail with reference to the accompanying drawings.

2 is a block diagram showing a sub-screen 16: 9 screen size processing apparatus of a multi-screen television according to the present invention, wherein reference numeral 10 in the apparatus of the present invention selects one channel from the microcomputer 34 described later. Receiving a first channel tuning data (VT1) for tuning the corresponding channel and outputting in the form of an intermediate frequency signal mixed with an oscillation frequency signal generated by the first channel tuning data (VT1); 12 shows a tuner and receives the second channel tuning data VT2 for tuning of the other channel from the microcomputer 34 described later, and tunes the corresponding channel to the second channel tuning data VT2. A second tuner outputs in the form of an intermediate frequency signal mixed with an oscillation frequency signal generated by the present invention.

Further, reference numeral 14 denotes an image IF unit which intermediately amplifies a video signal of a television broadcast signal according to a plurality of channels from the first and second tuners 10 and 12, and 16 denotes the first and second tuners ( A voice IF section for amplifying an intermediate frequency amplified voice signal of a television broadcast signal according to a plurality of channels from 10 and 12 is shown.

Reference numeral 18 denotes a main / sub video signal and a main / sub audio signal of the intermediate / amplified composite video signal and the main / sub audio signal, which are amplified by the PIP mode switching control from the microcomputer 34, which will be described later. Represents a mode switch section that is selectively switched for processing.

Reference numeral 20 denotes a main composite image signal corresponding to the main screen through the mode switch unit 18, which is divided into luminance and color signals, and then subjected to luminance adjustment and color demodulation, and then synthesized and output as a composite image signal. 22 shows a synchronization extracting unit for separating and extracting a synchronization signal included in the main composite video signal, i.

Further, reference numeral 24 denotes a video signal processing of the sub-composite video signal from the mode switch unit 18, and a 4: 3 screen size or 16: 9 screen size under control from the microcomputer 34 described later. A sub-image processing unit for converting the size of the video screen of the picture.

As shown in FIG. 3, the sub-image processing unit 24 receives the horizontal / vertical synchronization signal H SYNC / V SYNC extracted from the synchronization extracting unit 22 to perform a PLL operation at a predetermined division ratio. The first PLL circuit 40 generating the first clock signal CLK1 having a pulse period corresponding to 4: 3 mode, and the horizontal / vertical synchronous signal H SYNC / V SYNC are inputted, and the PLL is supplied at a predetermined division ratio. A second PLC signal 42 which generates a second clock signal CLK2 having a pulse period corresponding to a 16: 9 mode, and receives a switching control signal SC2 from a microcomputer 34 to be described later. A switching circuit 44 which is switched to selectively output the first clock signal CLK1 from the circuit 40 or the second clock signal CLK2 from the second PLL circuit 42, through the switching circuit 44 Sampling the sub-complex video signal according to 4: 3 screen size by receiving the first clock signal CLK1 or the second clock signal CLK2 A data conversion unit 46 made of, for example, an analog-to-digital converter (ADC) for sampling in a period of time or a sampling period having a 16: 9 screen size and converting it into a form of digital data by time compression; The first clock signal CLK1 or the second clock signal CLK2 is input as a recording clock, and the sub-image data from the data converter 46 is recorded per image line, and is generated from the third PLL circuit 48. An image data storage unit 50 configured to receive a read clock signal and compress an image line at a predetermined ratio to read the image line, and convert the read sub-picture data into an analog signal in the form of an analog signal. And a data inverse conversion unit 52 made of an analog converter.

Here, the first clock signal CLK1 generated from the first PLL circuit 40 is, for example, 12 × X × Y Sec (that is, X is a horizontal frequency of the horizontal synchronization signal H SYNC, and Y is a preset division ratio. ), The second clock signal CLK2 generated from the second PLL circuit 42 has, for example, 16 × X × Y Sec.

Also, reference numeral 26 denotes a blanking signal generation which describes a main composite video signal from the main image processing unit 20 and a sub composite video signal having a 4: 3 or 16: 9 screen size from the sub image processing unit 24. A signal multiplexer formed of, for example, a multiplexer which multiplexes and outputs the blanking signal BLK from the unit 28, and reference numeral 28 denotes a 4: 3 screen size under the control of an output mode by the microcomputer 34 described later. Or a blanking signal generator for generating a blanking signal BLK corresponding to a 16: 9 screen size, and 30 denotes a CRT of a main / sub-complex video signal according to a main / sub picture multiplexed through the signal multiplexer 26. (Cathode Rsy Tube; not shown) shows an image output unit for amplifying and outputting the screen to be reproduced.

Also, reference numeral 32 is a matrix button provided in a remote control unit for remote control or a predetermined control panel of the main body. The PIP key 32A sets a key for executing the PIP function, and a broadcast channel to be displayed on the main / subscreen. And a channel setting key 32B consisting of an up / down key for selecting a key, and a size setting key 32C for setting a key for switching the screen size of a sub-screen formed on the main screen to 16: 9 size. The setting part is shown.

Further, reference numeral 34 denotes a microcomputer that controls overall functional operations of the multi-screen television. The microcomputer 34 is configured to control the first and second tuners 10, according to the PIP function set by the function setting unit 32. A mode switching control signal SC1 for generating the first and second channel tuning data VT1 and VT2 for multiple channel tuning and selecting the main / sub picture to the mode switch section 18; To generate the switch control signal SC2 which causes the switching circuit 44 to switch to the second PLL circuit 42 side by operating the size setting key 32C of the function setting unit 32. do.

Next, the operation of the present invention made as described above will be described in detail with reference to the accompanying drawings.

First, the starting power is turned on in the multi-screen television, the PIP key 32A of the function setting section 32 is keyed to execute the PIP function, and the key operation of the channel selection key 32B is used for the main / subscreen. When a plurality of channels are selected, the microcomputer 34 generates a mode switching control signal SC1 in accordance with the execution mode of the PIP function to switch-control the mode switch unit 18, and simultaneously selects multiple channels of the selected plurality of channels. The first and second channel tuning data VT1 and VT2 are generated.

Accordingly, the first and second tuners 10 and 12 receive the first non-second channel selection data VT1 and VT2 from the microcomputer 34, respectively, and tune the corresponding channel. And an intermediate frequency signal mixed with the oscillation frequency signal generated by the second channel channeling data VT1 and VT2, and an intermediate frequency amplified through the video / audio IF units 14 and 16. The composite video signal and the main / sub audio signal are selectively output through the mode switch unit 18 so as to correspond to the main / sub picture.

Subsequently, the main composite video signal through the mode switch unit 18 is processed through the main image processing unit 20 to output the image signal, and the sub-composite video signal is converted into the data conversion unit 46 of the sub image processing unit 24. ), The division according to 4: 3 mode by the first PLL circuit 40, which receives the horizontal / vertical synchronization signal H SYNC / V SYNC extracted from the main composite video signal by the synchronization extractor 22. As a result, the first clock signal CLK1 generated as a result of the PLL operation is applied to the data conversion unit 46 through the switching circuit 44, so that the first clock signal CLK1 in the data conversion unit 46 is applied. The sub-complex video signal is sampled at a sampling period synchronous to and converted into digital data by time compression. The image data storage unit 50 receives the first clock signal CLK1 as a recording clock. The digitally converted subsidiary image data in image line units With rokham, the 3PLL is a composite unit the image data recorded by the read clock signal generated in the circuit 48, reading is performed to extract a video line-by-line.

Accordingly, the data inverse converter 52 converts and outputs the sub-compound video data read from the video data storage 50 in the form of an analog signal, and displays a 4: 3 screen from the blanking signal generator 28. The signal multiplexer 26 receiving a blanking signal corresponding to the magnitude receives and outputs the main composite video signal from the main image processing unit 20 and the sub-complex video signal from the data inverse converter 52 and multiplexes it. By doing so, the main / subcomposite video signal through the image output unit 30 is reproduced on the CRT screen, but the screen size of the sub-screen is reproduced as 4: 3 screen size.

At this time, when the playback image according to the sub-screen that is reproduced on the main screen has a 16: 9 mode and the size setting key 32C of the function setting unit 32 is keyed to change the screen size. The microcomputer 34 controls the switching circuit 44 of the sub-image processing unit 24 to be switched to the second PLL circuit 42 side, while the blanking signal generated from the blanking signal generator 28 is 16: The signal is converted to correspond to the screen size.

Accordingly, the second PLL circuit 42 receives the horizontal / vertical synchronous signal H SYNC / V SYNC and performs a PLL operation at a predetermined division ratio to thereby receive the second clock signal CLK2 corresponding to the 16: 9 mode. Will be generated.

On the other hand, the data converter 46 receives the second clock signal CLK2 as the sampling clock through the mode switch 44 and samples the sub-composite video signal to correspond to a 16: 9 screen size to compress the time. By converting into a form of digital data, and the sub-compound image data through the image data storage unit 50 is converted into an analog signal through the data inverse conversion unit 52 and outputted, the signal multiplexer 26 As shown in FIG. 4, when the blanking signal BLK corresponding to the 16: 9 screen size is input, the main composite video signal and the sub-compound video signal having a 16: 9 screen size are multiplexed and output. Among the 9 screen sizes, the horizontal video lines of the sub-composite video signal corresponding to the horizontal blanking period A of the horizontal screen size 16 are line compressed and scanned to form a sub-screen having a 16: 9 screen size.

According to the above-described present invention, when the composite video signal having a 16: 9 mode is reproduced in a sub-screen on a multi-screen television, the screen can be reproduced by being stretched to a 16: 9 screen size, so that normal screen reproduction is possible. This makes it possible to have an advantage that the viewing effect is increased.

Claims (2)

When the PIP function is executed, the multi-channel television broadcast signals simultaneously tuned through the plurality of tuners 10 and 12 are video / audio detected by the video / audio IF units 14 and 16, respectively, and the intermediate frequencies are amplified. In a multi-screen television which is divided into a main / sub composite video signal and a main / sub audio signal by the switch unit 18, and reproduces the screen as a main / sub picture image, and also reproduces audio as the main / sub audio. Function setting means (32) for performing a function setting for horizontally scaling the sub-screen to a 16: 9 screen size when the sub-picture is reproduced in a 16: 9 mode composite video signal according to the execution of the PIP function; Main image processing means 20 for processing a video signal of the main composite video signal to be the main screen playback through the mode switch unit 18, Synchronization extracting means 22 for separating and extracting a synchronization signal H SYNC / V SYNC included in the main composite video signal; A clock converting means for selectively generating a first clock signal CLK1 in 4: 3 mode and a second clock signal CLK2 in 16: 9 mode based on the extracted synchronization signal H SYNC / V SYNC , The sampling period is varied by the first clock signal CLK1 or the second clock signal CLK2 selectively generated from the clock converting means, and thus the sub-complex video signal from the mode switch unit 18 is changed by time compression operation. Image data converting means 46 for converting 16: 9 screen size or 4: 3 screen size digital data, Selectively receives the first clock signal CLK1 or the second clock signal CLK2 to record the sub-compound image data, and receives the read clock signal from the PLL circuit 48 to record the sub-compound image. Image data storage means 50 for reading the data by compressing the data in the image line unit, Image data inverse converting means 52 for converting the sub-compound image data read out from the image data storing means 50 into an analog signal; Signal multiplexing means (26) for multiplexing the main video signal from the main video processing means (20) and the sub-complex video signal through the video data inverse conversion means (52) as a main / sub-complex video signal; Blanking signal generating means 28 for selectively generating a blanking signal BLK having a 16: 9 screen size or a 4: 3 screen size as the signal multiplexing means 26, The second clock signal CLK2 is selectively generated from the clock converting means in accordance with a function for 16: 9 picture size transverse from the function setting means 32, and the blanking signal generating means 28 And control means (34) for controlling a blanking signal having a 16: 9 screen size to be generated from the sub-screen 16: 9 screen size processing apparatus for a multi-screen television. The first PLC circuit of claim 1, wherein the clock converting means receives the synchronization signal (H SYNC / V SYNC) and performs a PLL operation at a predetermined division ratio to generate a first clock signal CLK1 according to 4: 3 mode. A second PLC circuit 42 for receiving the synchronization signal H SYNC / V SYNC and performing a PLL operation at a predetermined division ratio to generate a second clock signal CLK2 according to 16: 9 mode; Switching controlled by the control means 34 to switch to selectively generate the first clock signal CLK1 from the first PLL circuit 40 or the second clock signal CLK2 from the second PLL circuit 42. A sub-screen 16: 9 screen size processing apparatus for a multi-screen television, comprising a circuit 44.