KR20120135856A

KR20120135856A - Apparatus of video processing for digital broadcasting receiver

Info

Publication number: KR20120135856A
Application number: KR1020110136912A
Authority: KR
Inventors: 김대영
Original assignee: 김대영
Priority date: 2011-06-07
Filing date: 2011-12-18
Publication date: 2012-12-17

Abstract

PURPOSE: An apparatus of video processing for digital broadcasting receiver is provided to reduce the imageless period of a video playing apparatus and to shorten the delay time of broadcast channel modification. CONSTITUTION: A control unit inputs video information of each reproduction channel to an image information selector. The image information selector selects respectively video information. A video buffer controller inputs selected video information to a video information region of a buffer memory. A video decoder decodes input video information. The video decoder inputs a decoded image signal to the video signal region of the buffer memory. The signal processing unit outputs a video signal. [Reference numerals] (AA) Channel change; (BB) No-image on; (CC) PID setting; (DD) Image information output; (EE) Image information decoding; (FF) Output; (GG) No-image off; (HH) No-image; (II) Previous broadcast stop image; (JJ) Image signal processing delay; (KK) Low speed reproduction; (LL) High speed, low speed reproduction; (MM) Normal reproduction; (NN) Constant speed reproduction

Description

[0001] The present invention relates to a digital broadcasting receiver,

The present invention relates to an image reproducing apparatus for receiving digital broadcasting, and more particularly, to an image reproducing apparatus and method for reducing a waiting time and a channel changing delay time when a broadcasting is first viewed or a broadcasting channel is changed.

Digital broadcasting provides a clear and stable image compared to analog broadcasting. On the other hand, due to the long signal processing delay time, it is not possible to immediately watch an image by changing a broadcasting channel. 1 is a functional block diagram of a conventional digital broadcasting receiver. As shown in FIG. 1, the tuner 110 inputs a broadcast wave from an antenna or a cable, selects a broadcast channel according to a broadcast selection signal, inputs it to the demodulator 111, and outputs a transfer stream. The demultiplexer 112 inputs a transfer stream to separate and output image information, audio information, and other data information. The voice information (not shown) reproduces the voice by a separate voice decoder, and the data information (not shown) is input to the control unit 116, and the control unit 116 functions to collect broadcast information and decode the program. . In particular, the control unit 116 inputs and decodes the program specification information PSI (Program Specification Information) to set a packet identification number (PID) in the demultiplexer 112 to select a video and audio program, Respectively. The image information is input and stored in the image information area of the buffer memory 115 through the video buffer controller 113. The image information has a header for distinguishing the image units, and the video buffer controller 113 buffers the starting point of the image unit. A position address (pointer) stored in the image information area of the memory 115 is created, and a decoding time stamp (DTS) of the image information, the type of image information, that is, the type of I-, P- and B-image information. Remember your back. Strictly speaking, the time code is in the header of the GOP (Group of Picture) of the video information to be transmitted, and the header of the video information has a temporal reference, and the decoding time stamp is converted for each video information . When the difference between the reference clock system clock STC and the decoding time stamp DTS of the image information is small, the video decoder 114 inputs and decodes the image information, and the decoded image signal is input to the image signal region of the buffer memory 115. If the decoding timestamp DTS and the system clock STC of the video signal are the same, the input memory is outputted and output at regular intervals. The video signal is input to the signal processor 120, and the signal processor 120 performs video signal processing such as image quality improvement, and performs graphic processing to output the final video signal. The final video signal is sent to a display processing unit, converted into a signal suitable for display, and outputted as an image, and the broadcast is viewed by the display device.

The control unit 116 inputs an up-key, down-key or numeric-key, etc. from the user interface 117 to change the broadcast channel, outputs a broadcast selection signal to the tuner 110, and provides data information. The packet specification number PID required for the demultiplexer 112 is set by reading the program specification information PSI from the program specification information PSI, and a broadcast program of video and audio is selected. In addition, by receiving broadcast program information of a broadcast channel, the control unit 116 reads and stores it, displays it on a screen by a program check function, and can select and watch a selection while confirming.

Image information consists of information units of video units viewed on the display, and image information is used to decode and reproduce I-video information, I-video information, or P-video information that can be independently restored. P-image information for reproducing a new image by reference, B-image information for reproducing the image with reference to the front and rear I-image / P-image and the like. The video information is not input in the order of images to be reproduced and watched, and the decoded video signals are rearranged and outputted. B1, B2, P6, B4, B5, P9, B9, B9, B12, P9, B7, B8, P12, B10, B11, ... are input in this order. The video information of the video referred to in decoding the video information is first transmitted, and the video signal is decoded in the order of transmission, and the video signal is output and referred to. P6 decodes by referring to the video signal of I3, B4 and B5 decodes by referring to the video signals of I3 and P6, P9 decodes by referring to the video signal of P6, and B7 and B8 by P6 and Decoding is performed by referring to P9. If P-picture information or B-picture information is received first by changing the broadcast channel, the video signal cannot be reproduced until I-picture information is input, and even if I-picture information is input, the decoding timestamp DTS of the video information. Waits for a certain number of image information to be filled in the image information area of the buffer memory until the clock is similar to the system clock STC, and a predetermined number (hereinafter referred to as N) of the image information is input and stored in the image information area of the buffer memory. The decoding timestamp DTS and the system clock STC are similar to start video decoding and input into the video signal area of the buffer memory, and more than a certain number (hereinafter referred to as g) are input into the video signal area of the buffer memory and stored If the decoding timestamp of DTS is equal to the system clock STC, it starts to output, and outputs it at regular intervals to watch the image through the signal processor. . It is not possible to input video information for a while by changing the broadcasting channel, the video reproducing apparatus cannot play the video, there is no video waiting period without displaying the video, and the video information of the changed broadcasting channel is inputted for a certain time. You can watch the video, and there is a delay in changing the broadcast channel. As shown in (1) of FIG. 6, the conventional digital broadcasting receiver changes the broadcasting channel, the display screen is video-free, and the program specification information PSI is input over time to set the packet identification number PID in the demultiplexer. When the I-image information is output and the image information is input and stored in the image information area, N image information is input in the image information area and the decoding timestamp DTS and the system clock STC are similar to each other. G video signals are input and stored in the video signal area of the memory, and when the decoding time stamp DTS and the system clock STC of the video signal are equal, the video signals are started to be output, and the video signals are output in accordance with the cycle of the system clock. The video signal input to the signal processing unit 120 can display an image after the delay time of the signal processing unit 120. The video signal is released and the video starts to be displayed and the video of the changed broadcasting channel, Watch.

To watch the broadcast for the first time, the power is supplied, and the controller 116 boots the system of the digital broadcast receiver and tunes the tuner 110, the demodulator 111, the demultiplexer 112, the video buffer controller 113, The time required for initializing an image reproducing unit such as the video decoder 114 and stabilizing a system clock by receiving data information of a broadcast channel is required. In recent years, digital televisions are equipped with a large central processing unit (CPU) while controlling and diversifying functions. The booting time is long, and the video output device is delayed after booting. That is, when the power is turned on, the entire system is booted for various functions, the broadcast channel received before, the play channel is initialized, and the playback channel is played to watch and watch the video is inconvenient because it takes a long time. The power source can be controlled to watch a broadcast using a remote controller, and the main power can be turned on and off. Thus, the control unit 116 and the user interface 117 maintain the state of supplying power at all or some time. That is, when the power is turned on by the remote control in the state that the main power is turned off, the digital broadcasting receiver supplies the main power, boots the receiver system, the tuner 110, the demodulator 111, the demultiplexer 112, the video buffer controller 113, Initializes an image reproducing unit such as a video decoder 114, the tuner 110 selects a broadcast channel previously watched, and the demodulator 111, the demultiplexer 112, and the video buffer controller 113 operate sequentially. The video information is input and stored in the video information area of the buffer memory 115. The video decoder 114 starts to decode the I-video information, outputs a video signal by inputting and storing a predetermined number or more g of video signals in the video signal region of the buffer memory, and enables the video signal to be viewed on a display.

As described above, when receiving a digital broadcast and playing back an image, there is a delay time for processing the stream signal of the digital broadcast, changing the broadcast channel such as the time for setting the packet identification number PID by reading the program specification information PSI, and the I-video information. There is a time until inputting is performed. After inputting and storing a predetermined number N of video information in the video information area of the buffer memory, decoding and inputting and storing a predetermined number of g images in the video signal area of the buffer memory and outputting the video. View the video after the delay of the signal processor. When you watch a broadcast for the first time or change the broadcast channel, the video cannot be played for a while. In the conventional digital broadcast receiver, there is a video-free period in which a video is not displayed for a certain period of time. When watching for the first time, the user enters a standby state for a certain time, changes the broadcast channel, and watches a new or changed video after a certain time. The non-video period and the broadcast channel change delay time are very long as compared with the analog broadcast receiving apparatus. When powering on the digital broadcast receiver or the like, the system is booted with various functions, and the waiting time is long due to the long preparation process for initializing the video player and processing the signal, and the up-key, down-key, or number. -It is inconvenient because the waiting time is long to select the broadcasting by key.

In order to reduce the inconvenience as described above, in the present invention, the first I-video information input for the selected broadcast channel is immediately video decoded, and the decoded video signal is immediately output, so that N video information is input and g video is output. It decodes and reduces the waiting time and delay time due to the video signal delay of the video signal processor. By controlling the video decoding time by repeatedly outputting the video signal at low speed, etc., the decoding timestamp of the video signal to be output is controlled to be the same as the system clock, and the first video signal is output without passing through the video signal processor. After partially passing through, and finally outputs through the image signal processor. There are three playback channels that can select and play three broadcast channels and output three pieces of video information. Two candidate playback channels are provided for one playback channel that is currently watching the broadcast. When the user selects the broadcast channel being received, the video information of the candidate playback channel is selected and video decoded for viewing, the playback channel being continuously played is reduced to reduce the video-free period, and the waiting time after the channel is changed. To reduce latency. When the power is turned on, video tuners such as tuners, demodulators, demultiplexers, video buffer controllers, and video decoders are first initialized, and booting systems of digital broadcast receivers reduce the waiting time for images to be output and viewed. Alternatively, at least one playback channel can be operated even when the user is not watching a video, receiving broadcasts to collect broadcast information and video information, collecting information necessary for the video playback device, and turning on power for viewing. It supplies power to the device, drives the video reproducing apparatus according to the collected information, and enables the video to be immediately reproduced.

As described above, according to the present invention, it is possible to reduce the non-video period of the video reproducing apparatus for receiving the digital broadcasting and shorten the broadcasting channel changing delay time, thereby improving the inconvenience of viewing the broadcasting.

1 is a block diagram of a video playback function of a conventional digital broadcast receiver.
2 is a block diagram of a video playback function of a digital broadcast receiver according to a second embodiment of the present invention.
3 is a block diagram of a video playback function of a digital broadcast receiver according to a third embodiment of the present invention.
4 is a block diagram of a video playback function of a digital broadcast receiver according to a fourth embodiment of the present invention.
5 is a functional block diagram of a video signal processor and a graphics processor of the present invention.
FIG. 6 is a graph comparing the shortening effect of the channel change delay time of the present invention with the conventional time.

In the present invention, by changing the broadcast channel to read the video information of the demultiplexer, and confirms that the first input I-video information, starting from the I-video information to the video information area of the buffer memory, the video decoder For the first time, I-image information input and stored in the video information area of the buffer memory is immediately decoded and input and stored in the video signal area of the buffer memory, and the video signal input and stored in the video signal area is immediately output in accordance with the cycle of the system clock. The signal processing of the video signal processor is not performed. The B-picture information referring to the video signal decoded before the first-stored I-picture information is ignored without decoding, and video decoding is normally performed from the subsequent P-picture information. The decoding time stamp DTS of the video signal in which the first I-picture information is decoded is larger than the system clock STC and is temporally delayed and is decoded fast. Since the decoding is performed so that the video is quickly viewed, the decoding of the next video information is delayed, The video decoding and the buffer memory are controlled to control the decoding time stamp DTS of the video signal to be output to be equal to the system clock STC so that N video information Is input and stored, and g video signals are input and stored in the video signal area.

When the broadcast channel is changed, the final video signal of all the broadcasts input and stored in the video signal area of the buffer memory is repeatedly output to reproduce the still video, and the video information of the changed broadcast channel is output, And outputs it in accordance with the cycle of the system clock STC to shorten the broadcast channel change delay time and output the video signal having the decoding time stamp DTS to the DTS- STC + p) / p, and the reproduction speed becomes faster as time passes. The decoding time stamp DTS of the output video signal becomes equal to the system clock STC, and the reproduction is performed normally. Here, p is an appropriate number not smaller than 1, and controls the number of times of repeated output in accordance with the difference between the decoding time stamp DTS of the output video signal and the system clock STC. As soon as the broadcast channel is changed, the final video of the entire broadcast channel is output as a still video, and there is no video-video period. Immediately after the I-video information of the changed broadcast channel is output, Reduces the delay time, plays back slowly for a while, then plays back normally. The larger the value of p is, the slower the normal playback time becomes. The smaller the value of p is, the slower playback is. Since I-video information is detected and immediately decoded and outputted, the broadcast channel change delay time is shortened by the time for inputting N video information and reproducing g video. In order to reduce the channel change delay caused by the delay of the signal processor consisting of the image signal processor and the graphic processor, the first output image signal is output directly without passing through the image signal processor. As shown in FIG. 5, the image signal processor 520 includes signal processing stages 531, 532, 533, and 534, image signal buffers 521, 522, 523, and 524, and a selector 530. A four-stage video signal processor is shown, and video signal processing is divided into four stages. The video signal which is the output of the video decoder is inputted and outputted to the input 1, and the input is stored in the buffer 1 (521). The processing 1 531 inputs and stores the video signal input and stored in the buffer 1 521, processes one stage, outputs it to the input 2 before one video period passes, and stores it in the buffer 2 522. The processing 2 532 performs signal processing on the video signal of the buffer 2 522, outputs it to the input 3 before one video cycle, and inputs and stores it in the buffer 3 523. Thus, the same video signal is output to the input 1, and the video signal is output to the input 3, the input 4, and the input 5 after one video period. Finally, input 6 outputs a signal of zero. The selector 530 selects one input by inputting inputs 1, 2, 3, 4, 5, and 6, and outputs the selected input. The selector 530 selects the input 6, and when the broadcast channel is changed or the video decoder is selected and the video information is first inputted and decoded to output the video signal, the selector 530 selects the input 1 When the first video signal is input and the video signal processing is started, the selector 530 keeps the next output as the previous output to advance the video or to input 3, and so on, and outputs the same image. Finally, input 5 is selected and held. As described above, the four-stage video signal processor can control the delay of four images. Hereinafter, the delay control capability of the video signal processor is represented by x, and the delay control capability of the video signal processor of FIG. 5 is x = 4. The graphic processor 540 outputs the final image signal in which the image and the graphic overlap by overlapping the image signal and the graphic signal. The graphic processor 540 includes an image overlapper 541 and a graphic generator 542. The graphic generator 542 inputs information such as a partial image, a dot, a line, a face, and a text to generate a graphic image ja. It generates and outputs, outputs a ratio r overlapping with the video signal ia and inputs it to the image overlapper 541. The image overlapper 541 inputs the video signal ia and the graphic image ja. By converting it into ia * (1-r) + ja * r, etc., it outputs the final video signal and minimizes the delay of the video signal.

If the process of inputting and decoding image information and outputting a video signal in the conventional digital broadcast image playback apparatus of FIG. 1 as the first embodiment of the present invention is controlled as in the present invention, There is no video period, and the delay time for changing the broadcast channel is reduced. That is, as shown in (1a) of FIG. 6, when the broadcasting channel is changed, the final image of all the broadcasting channels is repeatedly output and output as a still image, and the broadcasting specification of the changed broadcasting channel is input to read the program specification information PSI to read the packet. Set the identification number PID to the demultiplexer, decode the I-video information as soon as it is input, output the video signal, and output as fast as N + g + x video cycles to reduce the channel change delay time and control the repetitive output. At low speed playback, N video information and g video signals are filled in the video information area of the buffer memory and normal playback is performed while the delay control of the video signal processor is completed. Since the P images are repeatedly outputted and reproduced at a low speed, the N + g + x + p images are outputted normally and then reproduced normally.

2 shows a second embodiment of the present invention in which a reproduction channel 1 230, a reproduction channel 2 240, and a reproduction channel 3 250, which are composed of a tuner, a demodulator and a demultiplexer, The video buffer controller 213 outputs the video information 1, the video information 2, and the video information 3 to the video information selector 218 controlled by the control unit 216, In the video information area of the buffer memory 215. [0050] The video information input and stored in the video information area is decoded by the video decoder 214, and the decoded video signal is input and stored in the video signal area of the buffer memory 215 and output at regular intervals of the system clock. The video signal is input to the signal processing unit 220, and the final video signal is output to the display processing unit to view the video.

The control unit 216 stores the broadcast channels m (1), M (2), ..., M (m-1) and M (m) selected by the viewer, You can change the broadcast channel by entering a key. (1), A (2), and A (2) of the reproduction channel 1 230, the reproduction channel 2 240, and the reproduction channel 3 250, 3) is sequentially designated by M (i-1), M (i), and M (i + 1), video information of the current playback channel t (I + 1) of the playback channel t + 1 if the viewer inputs the up-key and changes the playback channel t + 1 to the broadcast channel M (i + 1) The same. Next, if the user inputs the up-key or the down-key to immediately change the broadcast channel, if the broadcast channel A (t + 2) of the playback channel t + 2 is designated as M (i + 2) (i + 1) is reproduced in the reproduction channel t + 1, and M (i + 2) is reproduced in the reproduction channel t + 2 so that the channel can be immediately changed to the up-key and the down- . If t is greater than 3 in the reproduction channel t and the broadcasting channel A (t), the reproduction channel t is a reproduction channel t-2, A (t) is A (t-2) Is less than 1, then the reproduction channel t is a reproduction channel t + 2, and A (t) is A (t + 2). I is 1, 2, 3, ..., m-1, m and M (i) is equal to M (i-m + 1) if i is greater than m for M M (i) is equal to M (i + m-1). If the user selects the broadcast channel by selecting the video information of the other-playback channel by inputting the up-key, the up-key is inputted next to change the broadcast channel of the next-playback channel to be selected, If the broadcast channel is selected by selecting the video information of the playback channel, the broadcast channel of the next-playback channel to be selected after the down-key is input is set to be set, and even if the down- It is possible to select the video information of the reproduction channel and to reproduce and view the video of the reproduction channel.

If another-reproduction channel is selected by inputting the up-key or the down-key, the other-reproduction channel outputs video information and waits for output, so that the video information of the other-reproduction channel can be directly read, It is stored in the buffer memory 215 to be decoded and started to be stored in the buffer memory 215. The buffer memory 215 stores the video signal in the video signal area of the buffer memory 215 and outputs it immediately. The next-playback channel selects the broadcast channel of the tuner of the next-playback channel according to the order stored in the controller, resets the next-playback channel, reads the program specification information PSI, and sets the packet identification number PID in the demultiplexer. Select a program, wait for the video information of the next-playback channel to be input, and prepare for selection of the next-playback channel. 6A, when the channel is changed by the up-key or the down-key, the video signal area of the buffer memory is cleared with only the final video signal of the entire broadcast channel, and the final video of the entire broadcast channel is repeated Video information of the changed broadcast channel is input, the video signal is output, and the video signal is outputted to shorten the channel change delay time, and the video signal is reproduced at low speed by controlling the repetition output, N image information in the region and g image signals in the image signal region are filled and the delay of the image signal processor is completed. The second embodiment of the present invention changes the broadcast channel by changing the broadcast channel in advance and setting the packet identification number PID in the demultiplexer to select the playback channel outputting the video information, - The time of inputting video information is fast, the time of still image outputting the last video of all broadcasting is shortened, and the channel change delay time is shortened.

In the second embodiment of the present invention, the last image of all broadcasts is reproduced as a still image until the broadcasting channel is changed and the I-image information is input, but before the I-image information is output from the selected playback channel, the image information selector ( 218 selects and outputs the video information of the previous playback channel to play back the video of all broadcast channels normally. If I-video information is output to the changed playback channel, the video information selector 218 selects I of the changed playback channel. Output video information, from which the video information is decoded as described above, and the video signal is output and reproduced. That is, as in (2b) of FIG. 6, the entire broadcast continues to be reproduced even when the channel is changed, and the video of the changed broadcast channel is outputted while the I-video information is output from the changed playback channel. The second embodiment of the present invention is effective when the distance between the I-picture information of the broadcast is short.

3 is a diagram illustrating a playback channel of a playback channel 1 330, a playback channel 2 340, and a playback channel 3 350 each including a tuner, a demodulator, and a demultiplexer. Receives and outputs image information 1, image information 2, and image information 3, and the video buffer controllers 313a, 313b, and 313c input the above image information into respective image information areas of the buffer memory 315. The image information stored in the image information area is selected by the image information selector 318 and decoded by the video decoder 314. The decoded image signal is stored in the image signal area of the buffer memory 315. The video signal inputted and stored in the video signal area is output at regular intervals of the system clock. The output video signal is input to the signal processing unit 320 to output the final video signal, and the video signal is sent to the display processing unit to view the video. As in the second embodiment, the viewer can change the channel by inputting the up-key or the down-key to select the video information of the another-playback channel, and then prepare the input of the up- And the next-playback channel controls the broadcast selection. When the up-key or down-key is selected to select video information of another play channel, the video signal area of the buffer memory 315 is emptied leaving only the video signal of the last video of all broadcasts. The video information is input and stored in the video information area of the other playback channel, and the decoding timestamp DTS finds the I-video information closest to the system clock STC and starts video decoding the video information in the video signal area of the buffer memory 315. Input and output, and outputs the video signal at a predetermined period of the system clock, the selector of the video signal processor of the signal processor 320 selects the input 1 and outputs. B-picture information after the first I-picture information is ignored, and if (DTS-STC + g) is negative for the decoding timestamp DTS of the video information, the B-picture information is skipped without decoding and the next video information is skipped. Decode timestamp, and decode timestamp of output video signal. If (DTS-STC) is negative, DTS outputs the next video signal and double-speed playback. (DTS-STC + p) / p is repeatedly output and playback is slow. Outputs a video signal at a predetermined cycle of the system clock, sends the video signal to the signal processing unit 320, performs a delay control of the video signal processor, performs graphic processing, and sends the final video signal to the display processor to view the video. Reset the next-playback channel and the selected video buffer controller by selecting the next-playback channel, select the broadcast channel, read the program specification information PSI, and set the packet identification number PID in the demultiplexer to Selects, waits for the video information of the next-playback channel to be input, and inputs and stores in the video information area of the buffer memory 315 from the I-video information, and waits for selection. As shown in (3) of FIG. 6, when the channel is changed, the final image of all broadcasting channels is output as a still image, and the decoding timestamp DTS is input and stored in the video information area of the changed playback channel closest to the system clock STC. Selects and decodes I-video information and outputs a video signal, so that the final video of all broadcast channels is played back 2 videos and the changed broadcast channel is watched. The video buffer of the video signal area is filled, and the video signal processor delays control, and the video signal processor performs normal playback as the delay control is completed. Unlike the first and second embodiments, the broadcast channel is changed in advance and the packet identification number PID is set, the video information is outputted to select the video information of the video information area to which the video information is input and stored to change the broadcast channel, The I-picture information stored in the area is directly decoded, so that the delay time is shortened to one video period.

4 shows a fourth embodiment of the present invention in which the video information of each of the reproduction channel 1 430, the reproduction channel 2 440 and the reproduction channel 3 450 includes video buffer controllers 413a, 413b, 413c to output the video signal 1, the video signal 2, and the video signal 3, and outputs the video signal 1, the video signal 2, and the video signal 3 to the video signal selector 414a, 414b, 414c controlled by the control unit 416, 419 are inputted to the signal processing unit 420 to output the final video signal, and the video is displayed on the display unit. Similarly, if the video signal of the other-reproduction channel is selected by the up-key or the down-key, the video signal of the other-reproduction channel being decoded by the video decoder of the other-reproduction channel is selected. On the other hand, the selection of a broadcast channel of a next-reproduction channel resets a next-reproduction channel and a video buffer controller, selects a broadcast channel, reads a program specification information PSI to set a packet identification number PID, Video information of the broadcast channel of the next-reproduction channel is input and is input and stored in the video information area of the next-reproduction channel of the buffer memory 415 from the I-video information, The video information of the channel is decoded by the video decoder and stored in the video signal area of the next-reproduction channel of the buffer memory 415, and outputted at a constant cycle to prepare for selection. Since the video information of the different-reproducing channel is continuously input and stored in the buffer memory 415 and video decoded and output, the video signal of the changed different-reproducing channel can be watched after the video signal of the previous broadcasting channel, Is not viewed as a still image, and there is no broadcast channel change delay time. If the delay control of the video signal processor is not performed, the video image of the broadcast changed after the delay time of the video signal processor will be outputted as shown in (4) of FIG. However, in order to control the delay of the video signal processor, the video decoder controls the video skip control, and the video signal processor can overcome the delay by controlling the video signal at the constant speed. If video signals are to be output by the video decoder of the selected reproduction channel to A1, A2, A3, A4, A5, A6, A7 or the like, then actually output A1, jump over A2, output A3, The output of the video signal processor goes beyond the delay control capability of the video signal processor. In the video signal processor, the selector 530 selects the input 1 when the video signal is selected. When the A1 signal reaches the input 1, the selector 530 selects and outputs the signal. When the A1 signal reaches the input 2, After one video cycle, if A3 arrives at input 2, it selects and outputs one, then advances one stage and outputs A3 when A3 reaches to input 3, and A5 is input and A5 is repeatedly output 5, the video signal processor of 4 stages reproduces at a constant speed for 8 video periods with A1, A1, A3, A3, A5, A5, A7, A7, A9, A10, In FIG. 6 (4a), the video signal of the reproduction channel for outputting the video signal is selected and outputted, so that the video of the changed broadcasting channel can be viewed, the decoder intermittently jumps the video signal, Speed control by delay control.

In the first, second, third, and fourth embodiments described above, the system clock can be set as an absolute time, and the system clock can be controlled in synchronization with the time contained in the broadcast information of the broadcast channel. When the image is synchronized and controlled to the system clock of absolute time, the time for buffering the image information is generally long, and the capacity of the buffer memory is large. However, when only video information of one program is transmitted to one broadcast channel, such as high definition (HD) broadcast, the video information is transmitted optimally and stably, the temporal change is small and the buffer of the video information can be reduced, The size of the buffer is minimized and a system clock can be set by adding a time appropriate for the decoding time stamp of the first input I-picture information (time for buffering the video information and the video signal) when the reproduction channel is changed , The relative time system clock can be operated. Since the I-picture information has a larger amount of information than the P-picture information and the B-picture information, the I-picture information can be handled with a very small buffer size to the extent that the time axis of the P- or B- . If the size of the buffer is small, the time for low-speed reproduction in the first and second embodiments of the present invention is shortened, which is effective. On the other hand, in the third embodiment of the present invention, the buffer memory should at least be able to store image information between I-picture information of broadcasting, but if the capacity of the buffer memory is small, it is impossible to input and memorize all. It is effective to increase the buffer capacity and to store the video information between the I-picture information of the broadcast channel and to play back the connection between the broadcast channels before and after the channel change if the relative time system clock is operated. If the relative time system clock is used in the fourth embodiment, since the relative time clocks of the video decoders of the respective reproduction channels are different, the system clock should also be changed when changing the video signal selection. The video decoder has a relative time clock. When the video signal selector 419 changes the video signal, the system clock is changed to the relative time clock of the selected reproduction channel.

In the above second, third, and fourth embodiments, since the broadcast channel image is immediately changed by pressing the up-key or down-key, the key is repeatedly pressed by pressing the up-key or the down-key for a predetermined time or more. As described above, the playback channel is changed at regular intervals (the playback channel is set longer than the minimum time that the video channel can be detected by changing the broadcasting channel) and the broadcasting channel is selected. 1), M (i + 2) ... or in reverse order to select and watch broadcast channels. Also, the user can select a broadcasting channel by selectively inputting 10 keys of numbers 0, 1, 2, 8, and 9. The playback channel of the broadcast currently being watched is the first playback channel. First, reset the number MX to 0 before entering the numeric key. Each time a number-key is entered, MX is replaced by 10 * MX + a if the number entered is a, and MX is replaced by Max if MX is greater than the maximum broadcast channel number Max. (A). MX is less than 10 * MX and less than 10 * (MX + 1) in M (1), M (2), .. M (I) and M (i '), which are high in the second and third reproduction channels, respectively, to select a broadcast channel and wait for the next number input. (B). (A), it is confirmed that the broadcast channels of the second and third reproduction channels are the same as MX, and if the same channel exists, the second reproduction channel is designated, and if the broadcast channel of the second reproduction channel is not MX, (M (1), M (2), M (m-1), and M (m) that are not smaller than 10 * MX but smaller than 10 * (MX + ) Or 10 * (MX + 1) is greater than or equal to Max, Max is input to the broadcast channel of the third reproduction channel, and the next number-key input is awaited. If a number input is completed, a key for completing the numeric-key input is input, or a key is not input for a predetermined time, if there is a broadcast channel such as MX in the second and third reproduction channels, To output the video signal, to terminate the digit-key input, to reset MX to 0, to watch the playback channel t, and if there is no such, reset MX to 0 and terminate the numeric-key input. When the number-key input is terminated, the broadcasting channel immediately before the broadcasting channel A (t) in the M (1), M (2), ..., M (t + 1) and inputs a broadcast channel immediately after the broadcast channel A (t) to the broadcast channel A (t + 1) to secure a candidate reproduction channel to change the broadcast channel with the up- Prepare for key and down-key input.

Also, in the second, third, and fourth embodiments, when a broadcast program information display function key is pressed to confirm the broadcast program information or make a broadcast reservation, all of the broadcast channels registered in the control unit including the broadcast currently being reproduced The program information of the digital broadcast will be displayed. However, the broadcast information is not collected and broadcasts without broadcast program information are not displayed. Thus, the broadcast information is read by selecting and playing the broadcast channel on the second and third playback channels for the first playback channel that is currently being viewed. Collect broadcast program information. Since the broadcast channel is not changed / changed for viewing while the program information is being displayed, the broadcast channel of the second and third playback channels may be changed to collect and display broadcast information. When the collection of broadcast program information of all broadcast channels is completed or the display of broadcast program information is finished, the second and third playback channels immediately prepare for input of up-key and down-key. In this way, it is possible to reserve a broadcast viewing while confirming the program information. When the reserved broadcast time approaches, the video information selector 218, 318 selects the broadcast channel of the reserved broadcast and outputs the video information to the second reproduction channel faster than the reserved time. Or the video signal selector 419 selects and reproduces the second reproduction channel. M (1), M (2) ... M (i) are prepared for the first and second reproduction channels for selecting and viewing the reserved broadcast, in contrast to the input of the up key and the down key, respectively. ... M (m), the broadcast channels before and after the reserved broadcast channel are selected and reproduced.

A video buffer controller and a video decoder, such as a video information selector 218, a video buffer controller 213 and a video decoder 214 in the second embodiment, for PIP (Picture in Picture) Other video information selectors and video decoders such as the video information selector 318 and the video decoder 314 in the third embodiment and other video signal selectors such as the video signal selector 419 in the fourth embodiment do. Here, the video decoder can simplify the reproduction with degraded image quality, and the output video signal is input into the (partial) image of the graphic generator 542 of the graphic processor 540 of the signal processing unit 220, 320, or 420, And can be superimposed on the main video signal ia by the video superimposer 541. [ If there is a PIP selection-key in the user interface 217, or 317, or 417, and the PIP is selected by pressing the PIP selection key, the PIP image window is set in the main video screen and the video is reproduced. At this time, when PIP selection key is input, the PIP image window disappears. If the PIP selection key is normally input, the PIP image window is displayed and the main screen image is played back. Can be reproduced. That is, when the PIP selection key is depressed, the broadcast channel previously viewed in the PIP image window is selected and reproduced in the second reproduction channel. If the selected PIP reproduction channel is stable due to the long pressing time of releasing the PIP selection- And reproduces the reproduced video signal in the PIP video window. If the pressed time is short, the main video reproduced in the first reproduction channel can be displayed in the PIP video window. If you press the PIP Select - key while watching PIP video, the PIP image window disappears, and if you press and hold it, you can change the broadcasting channel of the main image and PIP image. That is, in each image information selector, when the I-image information is inputted by the selector of the opponent, the video decoder decodes I-image information if the image information is selected and reproduced. Since the I-picture information is not output simultaneously on the two reproduction channels, it is not switched at the same time. Also, the broadcast channel to be reproduced in the PIP image window can be changed by the up-key or the down-key. When playing a PIP image, the up-key or down-key is applied to the PIP and not to the main image. If the main picture is reproduced in the PIP image window for the first reproduction channel for reproducing the main picture, the second reproduction channel and the third reproduction channel reproduce the broadcasting channel selected by the up-key and the down-key, respectively. If one key is input and the second reproduction channel is selected to reproduce the PIP image window, the third reproduction channel compares the input of the same key. When another key is input, the PIP image window reproduces the main image, and the second and third reproduction channels correspond to the respective keys. Likewise, during PIP playback, if the user presses the up-key or the down-key continuously to input and then depresses the key for a predetermined period of time, (I + 1), M (i + 2) ... in the order of M (i), M can do.

The controllers 116, 216, 316, and 416 of FIGS. 1, 2, 3, and 4 of the first, second, third, and fourth embodiments of the present invention control a video reproducing unit. To control. When the power is turned off and the broadcast is not watched and the power is turned on to watch the broadcast, the controllers 116, 216, 316, and 416 boot the system of the receiver and initialize the playback channel, the video decoder, the signal processor, and the display processor. When the entire image reproducing apparatus, i.e., the receiver system is booted, and the image reproducing unit, signal processing unit, and display processing unit such as a tuner, a demodulator, a demultiplexer, and a video decoder are initialized, broadcasts cannot be watched during booting. When the power of the video player is turned on, first, the tuner, demodulator, demultiplexer, video decoder, signal processor, and display processor of the video player are initialized to select a broadcast channel to be watched, and then watch the broadcast first. It would make sense to boot the system and activate the system to enable the add-ons. When the power is turned on in the broadcast receiver having the broadcast reception priority, the broadcast is first watched, and afterwards, the additional function may be operated so that the function selected by the viewer is activated. Or a separate central processing unit CPU for controlling one video playback unit to control one video playback unit, a signal processing unit, and a display processing unit, thereby initializing one video playback unit for fast broadcast viewing. The first control unit which controls one video reproducing unit and the second control unit which controls the system operate simultaneously. When the power is turned on, the first control unit initializes the image reproducing unit, the signal processing unit, and the display processing unit to quickly watch the broadcast. 2 The controller boots the system. Alternatively, the system simultaneously boots up the system while initializing the functions of the image reproducing unit, the signal processing unit, and the display processing unit, thereby quickly watching the broadcast and booting the system quickly. In other words, when the power is turned on, the tuner is initialized, and the previously watched broadcast channel is inputted to the tuner to select the broadcast channel and start the system booting of the broadcast receiver.The broadcast channel is selected so that the bit stream passes through the demodulator to provide the When data information is printed, system booting is suspended. Reads the data information, collects information for initializing the image reproducing unit, the control unit, and the display processing unit, initializes the image reproducing unit, the signal processing unit, and the display processing unit, and returns to continue booting the system. Data information is input again to stop the system boot, read the program specification information PSI from the data information, set the packet identification number PID in the demultiplexer, and continue the reboot, and the video information or audio in the demultiplexer that has set the packet identification number. When the information is printed, booting stops again. It reads the video information / audio information and inputs it into the video information / audio information area of the buffer memory and returns to boot the system again. It reads the control values of the video decoder from the broadcast information or the video information sequentially output, sets the video decoder, and controls the video reproducing unit in order to set the initial value or the function of the signal processing unit, the display processing unit, and boots the system. The image reproducing unit, the signal processing unit, and the display processing unit are initialized and the image information is inputted and decoded, and the signal is processed to output the image signal to watch the broadcast and boot the system. Enabling and controlling interrupts in sequential order is efficient. As in the second, third, and fourth embodiments, if a plurality of playback channels are provided, the first playback channel collects and initializes broadcast information on the broadcast channel to be watched, to watch the video, and After booting, the second and third playback channels collect broadcast information of other broadcasts and collect necessary information in preparation for the next channel change.

In the video reproducing apparatus synchronized with the absolute time, it is the time when the system clock STC is settled. It takes time to turn on the power, receive the broadcast, detect the reference time from the broadcast information, and correct the system clock STC. While turning on the power, select the previously watched broadcast to receive the video information and decode the video. If the system clock STC is invalid, the number of valid video information XT in the video information area of the buffer memory will be maintained at N. . If XT is smaller than N, the video signal is repeatedly output. If XT is larger than N, control is performed by skipping B-video information or by skipping video signal. Once N and XT are equal, they decode and output normally. If the system clock STC is modified by reading broadcast information, the video decoding is controlled by the decoding timestamp DTS of the video information or the video signal and the system clock STC. The predetermined value N may vary for each broadcast channel and may vary slightly over time. The constant value N described above is the number of valid video information input and stored in the buffer memory when the video reproducing apparatus is stable. A constant value N is detected for each broadcast channel, stored in the control unit, and used as necessary. If a relative time system clock is used, there is no problem by setting the system clock with a time code in the header of a GOP (Group of Picture) or a decoding time stamp of the I-picture information while the I-picture information is input.

When watching a broadcast and turning off the power or not watching a video, one of the playback channels is operated. If you are playing back a broadcast and playing broadcast information and video information, you want to watch the broadcast again by turning on the main power. You will be able to watch the broadcast you are playing without waiting. If the video channel is played back and the video information is played back and stored in the video information area of the buffer memory, the user can turn on the power and simultaneously decode the video to immediately play the video and output the video. To play back video information, store it in the buffer memory, and control the address, the central processing unit CPU of the control unit is operated, and only a part of the control unit may control the CPU speed. In other words, the clock frequency of the CPU can be lowered to reduce power consumption. At this point, additional information necessary for the stability or initial stage of system clock STC should be collected and revised from time to time. If one of the playback channels is watching the broadcast by playing the last broadcast channel and then turning on the power, the control unit initializes the functional device with a long waiting time first after turning on the power and outputs the video by normalizing the functions sequentially. do. On the other hand, the second and third playback channels are initialized, the broadcast channel is selected in preparation for the input of the up-key or the down-key, and the video information is played. In the monitoring state in which some circuits, i.e., only one playback channel supply power, are judged whether or not the bit stream is detected in a tuner of the monitoring playback channel, which is not watched, the function except the tuner if the bit stream is not detected or there is no broadcast information. The device does not supply power, and when the bit stream is detected, power can be supplied again to reduce unnecessary power consumption.

In the first, second, third, and fourth embodiments of the present invention, when the broadcast channel is changed, still picture playback, fast playback, or low-speed playback is performed to perform video decoding control. When the unnatural image is output for a while after the channel change, it can be controlled to be non-video. Or, when the still image is reproduced as a still image or a normal image of the previous broadcast, it is reproduced as a dark background image. Or a broadcast station name or a broadcast channel name. When the video of the changed broadcast channel is normally reproduced, it can be recovered and reproduced normally.

There may be many applications to be derived that are different from those shown in the first, second, third, and fourth embodiments. That is, video information such as IPTV, DMB broadcasting, or satellite broadcasting can be directly output by excluding or changing the functions of a part of the reproduction channel described above, for a broadcast signal directly inputting a bitstream or multiplexing a plurality of broadcast programs . Or an image reproducing apparatus for viewing 3D stereoscopic broadcasting transmitting multiplexed image information, the image information multiplexed in one channel may be divided into left and right video signals to reproduce an image, or may be divided into two channels A two-multiplexed video decoder or two video decoders for reproducing left and right channels, and a stereoscopic image can be reproduced with a multiplexed video signal processor. All of this can detect a stream of video information, and can be controlled in the same way as in the first, second, third, and fourth embodiments.

STC: System clock
DTS: Decoding timestamp of video information and video signal
N: the number of video information to be input to the video information area (buffer)
XT: the number of valid image information input to the current image information buffer
g: Number of video signals input to the video signal area (buffer) during normal playback

Claims

(a) a playback channel step of outputting video information;
(b) inputting and storing the image information in an image information area;
(d) a video decoding step of inputting and decoding the video signal input and stored in the video information area into the video signal area;
(e) outputting or repeatedly outputting the video signals inputted and stored in the video signal region in the order of viewing, and outputting at regular intervals;
(g) a control unit which controls the steps of (a), (b), (d) and (e) above; Image playback device having a.

(a) three playback channels for outputting respective video information;
(b) selecting and storing one image information from the three image information in the image information area;
(d) a video decoding step of inputting and decoding the video signal input and stored in the video information area into the video signal area;
(e) outputting or repeatedly outputting the video signals inputted and stored in the video signal region in the order of viewing, and outputting at regular intervals;
(g) a control unit which controls the steps of (a), (b), (d) and (e) above; Image playback device having a.

In addition to claim 2,
(b) selecting and storing one image information from among three image information in a second image information area;
(d) a video decoding step of inputting and decoding the video signal input and stored in the second video information area into the second video signal area;
(e) outputting or repeatedly outputting the video signals input and stored in the second video signal region in the order of viewing, and outputting at regular intervals; Image playback device having a.

(a) three playback channels for outputting respective video information;
(b) inputting and storing the three pieces of image information into respective image information areas;
(c) selecting one video information from among three video information input and stored in each of the video information areas;
(d) a video decoding step of selecting the selected video information or selecting the next video information if the selected video information is B-picture information, and storing the input and decoded video signal in the video signal area;
(e) outputting the video signals input and stored in the video signal region in the order of viewing, skipping and outputting the video signals in the next order, or repeatedly outputting them, and outputting them at regular intervals;
(g) a control unit for controlling the steps of (a), (b), (c), (d), and (e) above; Image playback device having a.

In addition to claim 4,
(c) selecting one video information from among three video information input and stored in each video information area;
(d) a video decoding step of selecting the selected video information or selecting the next video information if the selected video information is B-video information, and storing the input and decoded video signal in a second video signal region;
(e) outputting the video signals inputted and stored in the second video signal region in the order of viewing, skipping and outputting the next video signals in the following order, or repeatedly outputting the same, and outputting at regular intervals; Image playback device having a.

(a) three playback channels for outputting respective video information;
(b) inputting and storing the three pieces of image information into respective image information areas;
(d) Each of the video information input and stored in the above three video information areas is selected, or if the selected video information is B-video information, the following video information is selected and inputted and decoded video signals are inputted to each video. A video decoding step of input and storing in the signal area;
(e) Outputting the video signals inputted and stored in the respective video signal areas in the order of viewing, skipping or outputting the video signals in the next order, or repeatedly outputting. Outputting the respective video signals at regular intervals;
(f) selecting and outputting one video signal from the three video signals output at the predetermined period;
(g) a control unit for controlling the steps of (a), (b), (d), (e), and (f) above; Image playback device having a.

In addition to claim 6,
(f) selecting and outputting one second video signal from the three video signals output at regular intervals; Image playback device having a.

A stereoscopic image reproducing apparatus for displaying a stereoscopic image by dividing an output image signal of claim 1, claim 2, claim 4 or claim 6 into an image of left and right views.

The video reproducing apparatus of claim 1, 2, 4, 6, and 8, wherein the video signal processor includes a video signal selector for delay control of the video signal.

The video signal processor of claim 9, further comprising a video signal buffer and a processing step, wherein the video signal of each stage is output and selects and outputs an output signal, thereby delaying the video signal.

The apparatus of claim 1, 2, 4, 6, and 8, wherein the graphics processor includes a graphic overlapper and a graphics generator, and inputs a video signal and a graphics image generated by the graphics generator. And minimize the delay of the video signal by superimposing and outputting the same.

The graphic processor of claim 11, wherein the graphic processor includes an image overlapper and a graphics generator, and inputs a graphic signal generated by the graphics generator and the graphics generator to the image overlapper and outputs the overlapped image to minimize delay of the image signal.

If the decoding timestamp is invalid or the system clock is invalid in the video reproducing apparatus of claim 1, 2, 4, or 6, the predetermined value N and the number of valid video information XT input and stored in the video information area are If the decoding timestamp and system clock are valid, the decoding timestamp DTS and system clock STC of the output video signal are 0, so that MM = (DTS-STC) is 0. And video decoding by controlling the video decoding.

The difference between the decoding timestamp and the system clock, or a constant value, N, when the video reproducing apparatus of claim 1, 2, 4 or 6 changes the broadcast channel or changes the video information for the first time. The difference between the number of valid video information XT inputted and stored in the video information area is decoded starting from small I-video information, and the video signal decoded for the first video information is inputted into the video signal area and immediately output and decoded. Decoding time stamp of information DTS and system clock STC. Decoding time control of MD = (DTS-STC + g) or MD = (N-XT + g) to be close to 0. A video reproducing apparatus, which is controlled by stamp DTS and system clock STC so that MM = (DTS-STC) or MM = (N-XT) is zero.

If there is no video information to be output to a playback channel selected by the video reproducing apparatus of claim 1, 2, 3, 4, 5, 6 or 7, or there is no video decoded video signal, An image reproducing apparatus for repeatedly outputting an output image signal.

In the video reproducing apparatuses of claim 13 and 14, if the MM is positive, the video signal is repeatedly outputted. If the MD is negative, the video information is decoded beyond the B-video information without decoding, and the MM is decoded. If it is negative, the video reproducing apparatus for outputting and controlling the next video signal beyond the video signal to be output.

In the video reproducing apparatuses of claim 13 and 14, the predetermined value N is the number of valid video information input and stored in the video information area of the buffer memory when the first video information is inputted and starts to decode. The same, and stores a predetermined value N for each broadcast channel in the control unit and uses the control value as a control reference value when the decoding timestamp or system clock is invalid.

The video reproducing apparatus according to claim 1, 2, 4, or 6 changes the broadcast channel or changes the play channel, and video decodes the first input I-image information, and decodes the I-image information. A video reproducing apparatus for changing and setting a system clock by adding a time necessary for buffering video information and a video signal to a stamp.

In an image reproducing apparatus having a plurality of video decoders as described in claim 6, a clock is decoded and controlled for each video decoder, the output video signal of the video decoder is selected and output at regular intervals, and the system clock is set as the clock of the selected video decoder. A video reproducing apparatus which sets or sets the clock of a selected video decoder as a system clock.

In a video reproducing apparatus having three playback channels as described in claims 2, 4 and 6, the second playback channel is selected by an up-key for the first playback channel that is currently played back and viewed. Reproduces a broadcast channel to be played, the third playback channel plays a broadcast channel to be selected by the down-key, selects a playback channel by the up-key or down-key to watch the broadcast, and then inputs the same key And a broadcast channel selection control method of changing a broadcast channel of a playback channel to be selected.

In an image reproducing apparatus having three reproducing channels as described in claim 2, claim 4 and claim 6, by pressing and holding the up-key or the down-key, the broadcasting channel is changed at regular time intervals to change the image. A method for controlling broadcast channel selection by scanning and scanning an image of a broadcast channel by watching.

A video reproducing apparatus having a plurality of reproducing channels as described in claims 2, 4 and 6, for the first reproducing channel that is currently reproduced and viewed, the second reproducing channel has the number of the numbers input so far. Selecting a broadcast channel and selecting and playing a broadcast channel having a high probability that the next number-key is selected and selected after the third playback channel.

In the video reproducing apparatus provided with the multiple reproducing channels as in claim 2, 4 and 6, for the first reproducing channel which is currently watching and reproducing, other reproducing channels are broadcasts in which no broadcast program information is collected. And collecting broadcast program information, and preparing for an up-key, down-key, and the like after finishing.

A video reproducing apparatus having a plurality of reproducing channels as described in claims 2, 4, and 6, wherein a reserved broadcast channel is selected and reproduced for the second reproducing channel with respect to the first reproducing channel currently viewed. And selecting and watching a second play channel at a reserved time.

In the video reproducing apparatus of claim 3, 5 or 7, the PIP image window is opened by pressing a PIP (Picture in Picture) selection key, and a short press or a long press is pressed to view or display a main-screen image. PIP selection-key control method to watch the PIP image.

When the PIP (Picture in Picture) image is being viewed in the image reproducing apparatus of claim 3, 5 or 7, the PIP image window disappears or the PIP image window disappears by pressing or holding down the PIP selection key. -PIP selection-key control method to change screen image.

In the video reproducing apparatus of claim 3, 5 or 7, the first playback channel plays the main picture, and the second playback channel and the third playback channel play the PIP picture when the PIP (Picture in Picture) picture is played back. As a playback channel, one playback channel plays a PIP image, and the other playback channel plays a broadcast channel selected by a key repeatedly input of an up-key or a down-key. A PIP video control method of playing a video of one playback channel as a PIP video, and a second playback channel for up-key and a third playback channel for playback down-key.

The PIP (Picture in Picture) image is played by the image reproducing apparatus of claim 3, 5, and 7, and the up- or down-key is continuously pressed and inputted, and the broadcast channel is changed and reproduced at regular intervals. PIP video playback control method to scan (SCAN) the video of the broadcast channel.

8. The video reproducing apparatus of claim 3, 5 and 7, reproducing the first video signal and the second video signal, and outputting the video signals of the left and right views respectively.

The control unit of the video reproducing apparatus according to claim 1, 2, 4, and 6 is a tuner, a demodulator, a demultiplexer, a video decoder, and a video reproducing unit of a first reproducing channel to watch a broadcast for the first time. A video reproducing apparatus which initializes the processing unit and the display processing unit first to watch a broadcast, and thereafter boots the system and initializes other devices and additional functions.

The control unit of the video reproducing apparatus according to claim 1, 2, 4, and 6, comprising: a tuner, a demodulator, a demultiplexer, a video decoder of a first decoder channel for receiving a broadcast to play an image; And a second control unit for booting and controlling the system, wherein the first control unit initializes the image reproducing unit, the signal processing unit, and the display processing unit, and watches the broadcast quickly.

The control unit of the video reproducing apparatus of claim 1, 2, 4, and 6 initializes and boots the system to watch a broadcast for the first time. The tuner, the demodulator, the demultiplexer, and the video of the first play channel are used. An image reproducing apparatus which initializes an image reproducing unit, a signal processing unit, and a display processing unit of a decoder in sequence and boots a system to quickly watch a broadcast and control a system booting.

In an image reproducing apparatus having multiple reproduction channels as claimed in claim 2, 4, and 6, the first reproduction channel collects and initializes broadcast information of the broadcast to be currently watched, and the other reproduction channel is used for viewing. Collecting broadcast information of other broadcasts to prepare for a change in the broadcast channel, and after the end of the other broadcast information acquisition image playback apparatus for preparing for the up-key and down-key.

In the video reproducing apparatuses of claims 1, 2, 4, and 6, at least one playback channel operates to read program specification information and set a packet identification number to the demultiplexer even if the broadcast is not watched or the main power is turned off. And reproducing and outputting image information / audio information.

35. The apparatus of claim 34, wherein the tuner determines whether the bit stream is detected, and if the bit stream is not detected, cuts off power to the subsequent video signal processor, and if the bit stream is detected from the tuner, supplies power to the subsequent video signal processor. Video playback device to resume.

35. The method of claim 34, wherein the video is collected and controlled to control the output of the video information, the output of the video signal, and the system clock control information to maintain and control the function of the control unit, such as to maintain and control the effective system clock Playback device.