KR19980040488A - Sub picture playback controller of multi-screen television - Google Patents

Abstract

According to the present invention, only the main screen portion of the sub-picture signal is partially received by receiving transmission data having information on the main screen portion superimposed on the sub-picture signal to be reproduced from the multi-screen television to the sub-screen. Provided is a sub-picture reproduction control apparatus for a multi-screen television that can be reproduced.

Accordingly, the present invention provides a plurality of tuning means (4, 6, 8, 10) for simultaneously tuning a plurality of channels in the multi-screen playback mode, and a main / sub picture for the multiple channels tuned in the multi-screen playback mode. The mode switch means 12 which is switched to be reproduced, the main image processing means 14 for signal-processing the main video signal corresponding to the main screen via the mode switch means 12, and the sub picture reproduction Transmission data detection means (16,18) for detecting transmission data included in the vertical blanking period of the sub-picture signal to be detected and having information on the main screen portion of the sub-picture, and information on the main screen portion of the transmission data. Based on the sub-picture signal processing means 20, the main video signal processing means 14 and the sub-video signal processing means 20 from the sub-picture signal processing means 20 responsible for signal processing for sub-picture reproduction for the main screen portion Screen material for video signal The sub-picture signal processing means by recognizing information on the screen position designation / output means (22,24) for designating the position and the main screen portion of the sub-video according to the transmission data from the transmission data detection means (16,18). And control means 28 for controlling the signal processing operation for the main screen portion of 20.

Description

Sub picture playback controller of multi-screen television

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sub-picture playback control apparatus for a multi-screen television. More particularly, the present invention relates to transmission data superimposed on a television broadcast signal in a multi-screen television capable of simultaneously playing back multiple channels of broadcast programs through a main / sub-screen. The present invention relates to a sub picture reproducing control apparatus of a multi-screen television that receives information of a main part of a sub picture signal reproduced by a sub picture so that only a partial picture signal of the main picture part is reproduced through the sub picture.

As is well known, in a general television, a result of processing a video / audio signal by selecting a desired single channel television broadcast signal from a plurality of television broadcast signals transmitted from a plurality of television broadcast stations through a single tuner. Since the video signal is reproduced as a single screen through a CRT (Cathode Ray Tube) device that reproduces one screen, the audio signal is output through a speaker that reproduces the audio of a single channel. If you want to watch the TV broadcasts of the channel you were watching now was not able to watch.

As a result, PIP (Picture In Picture), which allows sub-screens (multi-screens) consisting of multiple screens to be inserted on the main screen (main screen), which is reproduced in one CRT device, to solve such viewing disadvantages. The multi-screen TV with the PIP function allows multiple channels of TV broadcast signals to be tuned and processed simultaneously through the main and sub-screens. The video can be played back.

Through the main / sub picture reproducing function of the multi-screen television, simultaneous channel selection is performed on the multi-channel broadcast program so that the screen can be reproduced simultaneously. It has the advantage of being able to meet simultaneously.

However, in a multi-screen television capable of simultaneous playback of the main / sub picture, the screen size of the sub picture formed on the main screen is not only too small than that of the main picture, and the sub picture signal to be reproduced on the sub picture as a whole is sub-picture. Since it is possible to reduce the screen size by processing the data appropriately to the screen size of the screen, there is a disadvantage that it is impossible to sufficiently view the screen having the caption character of the important scene or important content.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and by receiving transmission data having information on a main screen portion superimposed on a sub video signal to be reproduced from a multi-screen television to a sub picture, It is an object of the present invention to provide a sub-picture reproduction control apparatus of a multi-screen television that allows only a main screen portion to be partially reproduced.

According to the sub-picture playback control apparatus of the multi-screen television according to the present invention for achieving the above object, a plurality of tuning means for simultaneously tuning a plurality of channels in the multi-screen playback mode, and the tuning in accordance with the multi-screen playback mode A mode switch means for switching to reproduce the main / sub picture for a plurality of channels, a main image processing means for signal-processing a main video signal corresponding to the main screen through the mode switch means, and Transmission data detecting means for detecting transmission data included in the vertical blanking period of the sub-picture signal to be detected and having information on the main screen section of the sub-picture, and the main screen based on the information on the main screen section of the transmission data Sub-image signal processing means in charge of signal processing for sub-picture reproduction for the sub-, sub-image signal processing with the main video signal processing means A screen position designation / output means for designating a screen reproduction position for the main / sub video signal from the stage, and the sub picture signal by recognizing information on the main screen portion of the sub video according to the transmission data from the transmission data detection means; Provided is a sub-picture reproduction control apparatus for a multi-screen television, comprising control means for controlling signal processing operations for the main screen portion of the processing means.

According to the present invention configured as described above, in a multi-screen television capable of simultaneous reproduction of main / sub picture, the transmission data transmitted in the vertical blanking period of the sub picture signal for sub picture reproduction is designated as the main screen part of the sub picture. When the information is included, only the video signal constituting the main screen portion from the sub video signal can be reproduced as a sub picture by processing the sub video signal.

1 is a block diagram showing a sub-picture playback control apparatus of a multi-screen television according to the present invention;

FIG. 2 is a block diagram showing a detailed configuration state of the sub-image signal processor shown in FIG. 1;

3 is a diagram illustrating a state in which a partial video screen of a main screen unit is reproduced on a sub screen according to an exemplary embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

2: receiving antenna, 4: first tuner,

6: 2nd tuner, 8: 1st video IF part,

10: second image IF unit, 12: mode switch unit,

14: main video signal processing unit, 16: synchronous extraction unit,

18: transmission data extraction section, 20: sub-video signal processing section,

22: screen position indicator, 24: video output unit,

26: function setting section, 28: control section,

30: sub-image processing unit, 32: ADC,

34: video memory, 36: DAC,

38: first PLC circuit portion, 40: second PLC circuit portion,

42: switching switching part.

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

1 is a block diagram showing a sub-picture playback control apparatus of a multi-screen television according to the present invention. In the apparatus of the present invention, reference numeral 4 denotes a channel channel for tuning one channel from the control unit 28, which will be described later. A first tuner which receives data VT1 and tunes a corresponding channel, mixes it with a local oscillation frequency signal generated from the channel tuning data VT1, and outputs it as an intermediate frequency signal. 28) receive the channel tuning data VT2 for tuning the other channel, and tune the corresponding channel, and mix with the local oscillation frequency signal generated from the channel tuning data VT2 to output it as an intermediate frequency signal. The second tuner is shown.

Further, reference numeral 8 denotes a first video IF unit for intermediate-frequency amplifying the television broadcast signal tuned through the first tuner 4, and 10 denotes an intermediate portion of the television broadcast signal tuned through the second tuner 6; A frequency amplified second image IF part is shown.

In addition, reference numeral 12 switches switching so that video signals according to the selected multiple channel television broadcasts are individually processed by video signals according to execution of the multi-screen playback mode from the controller 28, which will be described later. The mode switch section shown.

Reference numeral 14 denotes a composite video signal by separating the main video signal corresponding to the main screen according to one channel through the mode switch unit 12 into a luminance signal and a color difference signal, and performing luminance adjustment processing and color demodulation processing. A main video signal processor for synthesizing and outputting.

Also, reference numeral 16 denotes a synchronization extracting unit for extracting a synchronization signal included in a sub-picture signal to be sub-picture reproduced through the mode switch unit 12, and 18 denotes a vertical blanking period based on the extracted synchronization signal. And a transmission data extraction unit for extracting the transmission data included in the sub-image and having information on the main screen unit of the sub-picture.

Reference numeral 20 denotes a signal processing capable of reproducing only the video signal corresponding to the main screen part from the sub video signal on a limited basis as the sub picture under the control of the controller 28, which will be described later, according to the information of the main screen part based on the transmission data. A sub picture signal processing unit is shown.

As shown in FIG. 2, the sub-image signal processing unit 20 performs a sub-image processing unit 30 to amplify a sub-image signal that is the target of the sub-screen reproduction, and the sub-image signal. By an ADC (Analog-Digital Converter) 32 for sampling and digitally converting at a sampling rate synchronized with the first clock CLK1, and a write / read enable signal (W ENA, R ENA) from the controller 28 to be described later. The main screen stored at the read speed synchronized with the first clock CLK1 in addition to recording and storing only the image data corresponding to the main screen unit from the digitally converted sub-picture data at the recording speed synchronized with the first clock CLK1. Image memory 34 which reads negative image data reproducibly through the sub-screen with the same screen size as the main screen, and DAC 36 which analog-converts the image data according to the main screen to be read. , After The first PLC circuit unit 38 generating a first clock CLK1 having a clock period for enabling data processing at a screen size corresponding to the main video signal, and a clock period for screen reduction to a sub-screen size. The second clock CLK2 receives the image memory 34 by switching control for sub-screen reproduction of the second PLL circuit unit 40 generating the second clock CLK2 and the main screen unit of the controller 28 described later. ) And a switching switch section 42 which is switched to switch the first clock CLK1 to be supplied as a synchronous clock at the same time.

Reference numeral 22 designates a screen playback position for each of the main / sub-image signals processed by the main image signal processing unit 14 and the sub-image signal processing unit 20 under the control of the controller 28 to be described later. 24 shows an image output section which amplifies the main / sub picture signal to which the screen position is designated and outputs it to be reproduced as a main / sub picture on the CRT screen.

Reference numeral 26 denotes a function setting section for key setting execution of the multi-screen playback mode for main / sub picture playback of a plurality of channels, consisting of a matrix button part provided in a remote control unit for remote control or a predetermined control panel of the main body.

Reference numeral 28 denotes a control unit for controlling the mode execution of the multi-screen playback mode by the key setting of the function setting unit 26. The control unit 28 uses the transmission data extraction unit 18 to control the mode execution. When the transmission data having the information on the main screen unit is extracted with respect to the sub-image signal, the image memory 34 of the sub-image signal processing unit 10 is synchronized with the synchronization signal for the sub-image signal from the synchronization extractor 16. In addition to generating the recording / reading enable signals (W ENA, R ENA) for storing / reading only the image data of the main screen part, the switching switching unit 42 is controlled for switching.

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

First, the multi-channel television broadcast signal is tuned through the first and second tuners 4 and 6, and the mode switch unit 12 is passed through the image intermediate frequency amplification through the first and second image IF units 8 and 10. By the switching switching of, the video signal corresponding to the main screen is processed by the main video signal processor 14.

On the other hand, the sub-image processing unit 30 of the sub-image signal processing unit 20 amplifies the sub-image signal corresponding to the sub-screen so that the signal can be processed, and the sub-image data that has undergone digital conversion through the ADC 32 is an image. A second memory having a clock period for the reduction of the screen from the second PLL circuit unit 40 while being recorded and stored at a recording speed synchronized with the first clock CLK1 from the first PLL circuit unit 38 through the memory 34 As it is read at the read speed synchronized with the clock CLK2 and is analog-converted through the DAC 36, the screen reproducing position for the main / sub video signal is designated by the screen position setting unit 22, and the image output unit is provided. The amplification operation at 24 reproduces the main / sub picture on the CRT screen.

In this state, the synchronizing extractor 16 extracts the synchronizing signal of the sub-video signal, and the transmission data extracting unit 18 performs an operation of extracting the transmission data included in the vertical blanking period by the synchronizing signal. do.

At this time, if it is determined that the data content of the transmission data extracted through the transmission data extracting unit 18 has information on the main screen portion of the sub-video signal, it is based on the information on the main screen portion. The recording / reading enable signals W ENA and R ENA are applied to the image memory 34 of the sub-image signal processing section 20, so that the image memory 34 has only the image data corresponding to the main screen portion among the sub-picture data. It is possible to record and store in a limited manner, and control the switching switch 42 to prevent the second clock CLK2 from the second PLL circuit 40 from being supplied as a read clock and at the same time, the first PLC circuit portion 38. The first clock CLK1 can be supplied from the image data such that the image data according to the stored main screen portion can be read out to have a screen size corresponding to the size of the main screen.

Accordingly, the sub-image signal through the sub-image signal processing unit 20 may be partially reproduced through the sub-screen 45 as the main screen portion corresponds to the screen size of the main screen as shown in FIG. Will be.

According to the present invention made as described above, when the transmission data superimposed and transmitted to the sub-picture signal that is the target of sub-screen playback in a multi-screen television includes information on the partial screen playback for the main screen unit, Since only the video signal corresponding to the main screen part of the sub-picture signal can be partially reproduced as the sub-screen, it is advantageous to effectively watch the main part of the video program to be reproduced.

Claims (2)

A plurality of tuning means (4, 6, 8, 10) for simultaneously tuning a plurality of channels according to the multi-screen playback mode; A mode switch means (12) switched to switch the main / sub picture reproduction for the selected multiple channels according to the multi-screen reproduction mode; A main image processing means 14 for processing a main image signal corresponding to the main screen through the mode switch means 12 so as to reproduce an image; Transmission data detection means (16, 18) included in the vertical blanking period of the sub-picture signal that is the target of the sub-picture reproduction, and detecting transmission data having information on the main screen portion of the sub-picture; Sub-image signal processing means (20) responsible for signal processing for sub-screen reproduction for the main screen unit based on the information on the main screen unit of the transmission data, Screen position designation / output means (22, 24) for designating a screen reproduction position for the main / sub video signal from the main video signal processing means (14) and the sub video signal processing means (20); Control means for controlling the signal processing operation for the main screen portion of the sub-image signal processing means 20 by recognizing information on the main screen portion of the sub-image according to the transmission data from the transmission data detection means (16, 18) A sub-picture playback control apparatus for a multi-screen television, comprising: 28. The method of claim 1, wherein the sub-image signal processing means 20 and the sub-image processing unit 30 for signal amplifying the sub-image signal to be subjected to the sub-picture reproduction, and the sub-image signal Only the image data corresponding to the main screen portion is recorded and stored in the digitally converted sub-image data by the recording / reading enable control of the digital conversion signal conversion section 32 and the control means 28, and the same as the main screen. A video memory 34 for reproducing read-out at a screen size, a signal inverse converting unit 36 for analog-converting video data according to the main screen to be read, and data processing at a screen size corresponding to the main video signal A first clock generator 38 generating a first clock CLK1 having a clock period, and for reducing the screen to a sub-screen size by switching control by reception of transmission data of the control means 28. Prohibiting the supply of the second clock CLK2 from the second clock generator 40 having a clock period, the first clock CLK1 is synchronized to the image memory 34 and the signal inverse converter 36. And a switching switching unit (42) for switching switching to be supplied as a sub-picture reproduction control apparatus for a multi-screen television.