KR100233389B1 - Pip apparatus in composit television receiver - Google Patents

Abstract

The present invention relates to an IP technology for processing one image source into a main image signal in a composite TV system and processing the other image source into a sub-screen image signal, The video signal recorded on the VCD is reproduced to recover the compressed video data, and then an image signal of a TV screen size is generated through an interpolation process or an arbitrary size A V-SYD signal regeneration processing unit 300B for generating a sub-screen video signal of a reduced form; And selectively receiving the video signal reproduced from the received broadcast video signal or the video signal and displaying the video signal on the CPT alone or displaying the broadcast video signal on a parent screen, And a video signal output unit 300C for performing synthesis processing so as to be displayed on the screen.

Description

The ipod device of the composite TV receiver

FIG. 1 is a block diagram of a general composite television receiver; FIG.

FIG. 2 is a detailed block diagram of an MPEG decoder in FIG. 1; FIG.

FIG. 3 is a block diagram of an embodiment of the PI device of the present invention.

FIG. 4 is a detailed block diagram of an MPEG decoder in FIG. 3; FIG.

FIG. 5 is an explanatory diagram for setting a sub screen display position according to the present invention; FIG.

FIG. 6 is an input selection explanatory view of an RGB switch incorporated in the chroma switching unit in FIG.

FIG. 7 is an explanatory view of the video data culling section in FIG. 4; FIG.

8 (a) is an explanatory diagram showing a size conversion process from a source image to a cull image.

FIG. 8 (b) is a signal flow diagram illustrating a display position setting process of a self-image.

FIG. 9 is a signal flow diagram illustrating a process for setting and displaying a desired size and position of a sub screen; FIG.

DESCRIPTION OF THE REFERENCE NUMERALS

300A: Broadcast signal reception processing unit 300B: V-CD signal reproduction processing unit

300C: Video signal output unit 300D: Sync signal output unit

301: tuner 302: intermediate frequency detector section

303: Detection signal amplifier 304: V-CD

305: CD control unit 306: MPEG decoder

307: NTSC encoder 308: Microcomputer for VCD

309: Audio amplifier 310: Chroma switching part

311: RGB amplifier 312: Sync signal separator

313:

The present invention relates to a Picture In Picture (PIP) technique for processing one picture source into a main picture signal in a composite television system and processing the other picture source into a sub picture signal, In performing an IP function on each image reproduced from a signal and a VCD (Video Compact Disc), the internal circuit of the existing MPEG decoder is slightly changed without using a separate IP means, And a switch is added to perform a pseudo IP function.

FIG. 1 is a block diagram of a general composite television receiver. As shown in FIG. 1, a viewer selects a broadcast signal of a desired channel in a high frequency (RF) broadcast signal input through an antenna ANT, A broadcast signal reception processing unit (100A) for selecting and restoring original video and audio signals; A VCD signal playback processing unit 100B for playing back the video and audio signals recorded on the VCD 104 and restoring the original video and audio signals; An audio amplifier 109 for amplifying and outputting the audio signal processed by the broadcast signal reception processing unit 100A or the V-CD signal reproduction processing unit 100B to a level suitable for output to the speaker SP; A video signal output unit 100C for selecting a video signal processed by the broadcast signal reception processing unit 100A and the VCD signal reproduction processing unit 100B and processing the processed video signal in a form suitable for display on the CPT and outputting the processed video signal; A synchronizing signal output unit 100D for supplying synchronizing signals Hsync and Vsync to the V-CY signal regeneration processing unit 100B and the video signal output unit 100C in order to synchronize the video signals outputted through different paths, ), And its operation will be described with reference to FIG. 2 as follows.

When the TV mode is selected, a high frequency (RF) broadcast signal received through the antenna ANT is channel-tuned by a viewer through a high frequency amplification and mixing process in the tuner 101, and the video and audio of the selected channel The intermediate frequency is supplied to the intermediate frequency detector 102 and the original video signal is detected. Since the intensity of the detected video and audio signals is very weak, it is suitable for outputting it through the detection signal amplifier 103 to the outside .

However, if the VCD mode is selected, video and audio data are separately detected by the CD control unit 105 in the data read from the VCD 104 and supplied to the MPEG decoder 106. [ At this time, the MPEG decoder 106 separates the original audio signals L and R from the compressed input data and outputs the separated audio signals L and R to the audio amplifier 109. On the other hand, the MPEG decoder 106 outputs red, (G) and (B), and outputs them to the NTSC encoder 107. The operation of the MPEG decoder 106 will be described in more detail with reference to FIG.

The compressed MPEG data (DATA) input through the CD control unit 105 is supplied to the system decoder 201 to separately detect audio and video data, and then the audio data is supplied to the audio decoder 202 again (L) and (R), and the video data is supplied to the video decoder 203 and outputted as a decompressed video signal. The red, green, and blue signals R, G, and B output from the video decoder 203 are enlarged to a screen size by the video interpolating unit 204 and then supplied to the video amplifier 205 To a predetermined level.

The red, green and blue signals R, G and B outputted from the video amplifier 205 are supplied to the NTSC encoder 107 and converted into a luminance signal Y2 and a color signal C2.

Therefore, the audio amplifier 109 receives the audio signals of the TV broadcast signals output from the detection signal amplifier 103 and the V-CD audio signals L and R output from the MPEG decoder 106, SP) to be output at a suitable level.

The chroma integrated element 110 receives the brightness signal Y1 / color signal C1 of the TV output from the detection signal amplifier 103 and the brightness signal Y2 / color signal Y2 of the VCR output from the NTSC decoder 107 (R), (G), and (B) for the red, green, and blue colors of the base band. The user can listen to a broadcast program or a program processed by the VCD 104 through the CPT.

In order to selectively display video signals input through different paths as described above on one CPT, the synchronization signal separator 113 must synchronize the two video signals. For this purpose, The horizontal and vertical synchronizing signals Hsync1 and Vsync1 are separated from the video signal and supplied to the chroma integrated device 110 and the RGB amplifier 111. The PLL unit 115 receives the horizontal and vertical synchronizing signals Hsync1 and Hsync1, Vertical synchronizing signals Hsync2 and Vsync2 are connected to the Vsync1 and Vsync1 to generate horizontal and vertical synchronizing signals Hsync3 and Vsync3 synchronized with each other by applying a PLL to the Vsync2, And the NTSC encoder 107, as shown in FIG.

However, in such a conventional multi-type television receiver, since a program received from a broadcasting station is received and displayed, or a program recorded on a VCD is reproduced and displayed, there is a defect that a service screen such as the IP can not be provided In addition, when it is desired to exhibit the pseudo IP function, an expensive pseudo IP circuit is added due to the characteristics of the circuit, which causes a disadvantage that it imposes an economic burden on viewers.

Therefore, it is an object of the present invention to provide a pagersystem of a composite television receiver capable of performing a pseudo IP function by adding a video data stream to a MPEG decoder circuit already used and adding an RGB switch.

FIG. 3 is a block diagram of an embodiment of the present invention for achieving the above object. As shown in FIG. 3, in a high frequency (RF) broadcast signal inputted through an antenna ANT, A broadcast signal reception processing unit 300A for selecting a broadcast signal of a desired channel and restoring the original video and audio signal; The video and audio signals recorded on the VCD 304 are reproduced and restored to restore the original audio signal. In addition, the compressed video data is restored and the video signal of the TV screen size is generated through the interpolation process A VCD signal regeneration processing unit 300B for generating a video signal for a sub-screen of a reduced size to an arbitrary size through a culling process; An audio amplifier 309 amplifying and outputting the audio signal processed by the broadcast signal reception processing unit 300A or the V / V signal reproduction processing unit 300B to a level suitable for output to the speaker SP; It is possible to selectively receive the video signal processed by the broadcast signal reception processing unit 300A or the VCD signal reproduction processing unit 300B to cause the broadcast video signal or the CVI video signal to be displayed alone on the CPT, A video signal output unit 300C for synthesizing the video signal to be displayed on the parent screen and the C-VIDEO video signal to be displayed on the child screen; In order to synchronize the video signals output through the different paths, the horizontal and vertical synchronizing signals (Hsync), (Vsync), and the pixel clock signal (PCLK) synchronized with the two image sources are generated and supplied to each part of the system. And a synchronization signal output unit 300D for controlling the deflection of the CPT in synchronization with each other. The operation and effect of the present invention configured as described above will be described in detail with reference to FIGS. 4 to 9 Respectively.

When the TV mode is selected, a high-frequency (RF) broadcast signal received through the antenna ANT is supplied to the tuner 301. At this time, the TV is tuned by the tuning data outputted by the microcomputer The channel is tuned. The video and audio intermediate frequency of the selected channel is supplied to the intermediate frequency detector 302 and the original video signal is detected. Since the intensity of the detected video and audio signals is very weak, the detected signal amplifier 303 ) To the outside.

When the VCD mode is selected, video and audio data are separated and detected by the CD control unit 305 from the data read from the VCD 304 and supplied to the MPEG decoder 306. At this time, the MPEG decoder 306 separates and outputs the original speech signals L and R from the input data simply compressed as described in the related art, and outputs it to the speech amplifier 309 side. On the other hand, (R), (G), and (B) for green and blue are detected and output to the NTSC encoder 307 side.

However, if the PIP mode is selected, for example, a broadcast video signal is displayed on the parent screen, and when a mode for displaying the video signal reproduced in the VCD 304 as a video signal of the sub screen is selected, The decoder 306 detects the original red, green, and blue signals R, G, and B from the compressed input data and then decides it under the control of the microcomputer 308 for V- And then outputs the video signal along with the switching control signal YS. The operation of the MPEG decoder 306 operating in this manner will be described in more detail with reference to FIG. 4, same.

The compressed MPEG data (DATA) input through the CD control unit 305 is supplied to the system decoder 401 to separately detect audio and video data, and then the audio data is supplied to the audio decoder 402 (L) and (R), and the video data is supplied to the video decoder 403 and outputted as a decompressed video signal.

When the VCD mode is selected but the pseudo mode is not selected, the movable terminal a of the RGB switch 404 is connected to the fixed terminal b (b) by the switching control signal CS outputted from the microcomputer 408 for MPEG decoder, The red, green, and blue signals R, G, and B output from the video decoder 403 are supplied to the video interpolator 405 via the RGB switch 404, Enlarged to the screen size, and then output through the video output unit 407.

The display start position of the sub screen image outputted in this manner is controlled by the program. When the sub screen image signal is not outputted, the switching control signal YS is outputted as " High " The switching control signal YS is outputted as " low ".

However, when the PI mode is selected, the movable terminal a of the RGB switch 404 is short-circuited to the fixed terminal c due to the switching control signal CS output from the microcomputer 408 for MPEG decoder, The red, green and blue signals R, G and B outputted from the video decoder 403 are supplied to the video data scrambler 406 through the RGB switch 404, And then output through the video output unit 407. [0154] FIG.

The red, green, and blue signals R, G, and B output from the video output unit 407 are converted into the luminance signal Y2 and the color signal C2 through the NTSC encoder 307.

Therefore, the audio amplifier 309 receives the audio signal of the TV broadcast output from the detection signal amplifier 303 or the V-CD audio signals L and R output from the MPEG decoder 306, SP) to be output at a suitable level.

When the TV mode or the V-CD mode is selected, the chroma switching unit 310 composed of the chroma integrated device and the switching unit converts the luminance signal Y1 / color signal of the TV output from the detection signal amplifier 303, Or the luminance signal Y2 of the VCR that is enlarged and output on the screen of the TV through the video interpolator 405 and the video output unit 407 and the NTSC decoder 307 of the MPEG decoder 306, Green and blue signals R, G and B of the base band and then amplified to an appropriate level through the RGB amplifier 311 (CPT), the viewer can listen to a broadcast program or a program reproduced on the VCD 304 via the CPT.

However, when the PI mode is selected, the chroma switching unit 310 selects the luminance signal Y1 / color signal C1 of the TV output from the detection signal amplifier 303 as a parent screen, (R), (G) and (B) for green, blue, and the sub-picture is converted into a video data stream 406 and a video output unit 407 of the MPEG decoder 306, an NTSC decoder (G), and (B) for the red, green, and blue colors of the base band by selecting the luminance signal and the color signal (Y2) / color signal (C2) When the switching control signal YS is supplied with a high level as shown in FIG. 6, the red, green and blue signals R, G and B of the main screen TV are selected, When the switching control signal YS is supplied at a low level, the red, green, and blue signals R, G, and B of the sub screen VCD are selected, The viewer can use the CPT Watching a broadcast program to be displayed as a main screen box and, at the same time, it is possible to simultaneously watch the characters of V CD program to be displayed on the screen.

In order to selectively display the video signals input through different paths as described above on one CPT, the synchronizing signal separator 312 must synchronize the two video signals. For this purpose, And outputs the generated horizontal and vertical synchronizing signals Hsync and Vsync and the pixel clock signal PCLK to the deflecting unit 313. On the other hand, (407) and the chroma switching unit (310).

5 shows a relationship between a horizontal synchronizing signal Hsync and a pixel clock signal PCLK when a video signal scaled down through the video data scrambler 406 of the MPEG decoder 306 is outputted. ), And in this example, 6 pixels are displayed at the moved position. In this way, the vertical start position also counts the horizontal synchronizing signal Hsync from the starting point of the vertical synchronizing signal Vsync to determine the sub-picture display position in the vertical direction Y, The display position of the sub screen can be set at a desired position in the horizontal direction. In addition, the size of the sub screen is determined by the squeezing rate of the video data squeezer 406, and the squeezing rate is controlled by the program.

7 shows an example of 1/2 stop by the video data scrambler 406 of the MPEG decoder 306. In order to remove high frequency components of the decompressed MPEG image 701, The 352 × 248 image 703 is skipped to the 176 × 124 image 704, that is, 2: 1 when the intermediate value is taken by covering the 2 × 2 window after passing through the window 702. Likewise, if you put a 4 × 4 window, you will be 4: 1.

8 (a) shows the magnification conversion process from the source image to the culling image, and FIG. 8 (b) shows the process of setting the display position of the sub-screen image (MPEG image). FIG. 9 is a signal flow diagram illustrating a process for setting and displaying a desired size and position of a self-image.

As described in detail above, according to the present invention, a video data screaming unit is added to an MPEG decoder circuit already used in a multi-type television receiver, and an RGB switch is added to perform a pseudo IP function, There is an effect that various service screens can be provided without giving a service screen.

Claims (4)

A composite television receiver for selectively receiving a video signal reproduced from a broadcasting signal and a recording medium (VCD) and displaying the video signal on a single CPT, comprising: a reproducing circuit for reproducing the video signal recorded on the VCD, A VCD signal regeneration processing unit 300B for generating a video signal of a TV screen size through an interpolation process or generating a video signal for a sub-screen of an arbitrary size through a scramble process; And selectively receiving the video signal reproduced from the received broadcast video signal or the video signal and displaying the video signal on the CPT alone or displaying the broadcast video signal on a parent screen, And a video signal output unit (300C) for synthesizing the video signal to be displayed on a screen. The video signal processing apparatus according to claim 1, wherein the VCD signal reproduction processing unit (300B) converts the compressed image data into red, green and blue signals (R), (G) and (B) A video decoder 403 for generating a video signal; Green and blue signals R, G and B outputted from the video decoder 403 under the control of the MPEG decoder microcomputer 408 to the video interpolator 405 or the video data panning An RGB switch 404 for transmitting the image signal to a history of the unit 406; A video interpolator 405 for interpolating the input video signal and enlarging the video to a screen size; A video data scrambler 406 for scrambling the input video signal to output the scaled down video signal; And outputs the red, green, and blue signals R, G, and B output from the video interpolator 405 in synchronization with the horizontal synchronizing signal and the pixel clock signal, or outputs them to the video data scrambler 406 And outputs a switching control signal YS for enabling selection of the red, green, and blue signals R, G, and B when synthesized with the background video signal, And an MPEG decoder (306) composed of an output unit (407). The apparatus of claim 2, wherein the culling rate of the video data culling unit (406) is determined by a program. The video signal output unit 300C according to claim 1, wherein the video signal output unit 300C includes switches SW1, SW2, and SW3 interlocked by a switching control signal YS output from the VCD signal reproduction processing unit 300B , Selectively receiving a broadcast video signal or a reproduced CW video signal, and displaying the broadcast video signal on a parent screen, or displaying a CW video signal on a sub screen And an RGB switch (601) for compositing processing.