KR101396702B1 - Apparatus of video processing for digital broadcasting receiver - Google Patents

Abstract

In a video reproducing apparatus for receiving digital broadcasting, when a broadcast is firstly viewed or a broadcast channel is changed, video decoding is performed immediately when first I-video information is input, video signals are immediately output to reduce a broadcast channel change delay time, The next video information is output or repeatedly output beyond the video information to decode the next video information or to control the decoding time stamp and the system clock to be equal to each other and to reproduce a plurality of broadcast channels In addition, there is a candidate reproduction channel for reproducing a different broadcast channel with respect to a reproduction channel which is reproduced by viewing a current broadcast channel. The user selects a candidate reproduction channel, selects and views video information or a video signal, Reduce time.

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, since the signal processing delay time is long, it is not possible to directly view the image by turning on the power or changing the broadcasting channel. 1 is a functional block diagram of a conventional digital broadcasting receiver. As shown in FIG. 1, the tuner 110 receives broadcast waves from an antenna or a cable, selects a broadcast channel according to a broadcast selection signal, inputs the selected broadcast channel to the demodulation unit 111, and outputs a transport stream. The demultiplexer 112 separates video information, audio information, and other data information by inputting a transport stream. The control unit 116 receives data information (not shown) to collect time information, broadcast information, broadcast program information, program specification information, and the like. 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 video information is input and stored in the video information area of the buffer memory 115 via the video buffer controller 113. The video information (MPEG stream, hereinafter referred to as a video stream) includes a header for identifying the video unit, The controller 113 creates a position address (pointer) in which the start point of the video unit is stored in the video information area of the buffer memory 115 and outputs a decoding time stamp DTS of the video information, -, P-, and B-image information. 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 . The video decoder 114 receives and decodes the video information and stores the decoded video signal in the video signal area of the buffer memory 115. When the decoding time stamp DTS of the video signal is equal to the system clock STC, And outputs a video signal of an image unit that can be viewed by the display device. The video signal is input to the signal processing unit 120, and the signal processing unit 120 processes the video signal, such as improving the image quality, and graphically processes the video signal 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, a down-key, or a numeric-key from the user interface 117 to change a broadcast channel, inputs a broadcast selection signal to the tuner 110, Reads the specification information PSI, sets the packet identification number PID necessary for the demultiplexer 112, and selects a video and audio broadcast program. In addition, the control unit 116 receives the broadcast program information of the broadcast information of the broadcast channel, and displays it on the screen by the program check function. Also, the system clock STC is set by reading the time information.

The image information is composed of information units of image units to be viewed on the display, and the image information is divided into I-picture information, I-picture information, or P-picture information, Picture information that can reproduce a new image with reference to the reference image, and B-picture information that reproduces the image by referring to the preceding and following I-picture / P-picture. 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 image to be referred to for decoding the video information is transmitted first, and the video information is decoded in the transmitted order, and the video signal is stored in the buffer memory and rearranged and output. When the video information is received first, the video signal can not be reproduced until the I-picture information is input. Even if the I-picture information is inputted, the decoding time stamp DTS of the video information becomes similar to the system clock STC, A predetermined number (hereinafter referred to as N) of video information is stored in the video information area of the buffer memory and the decoding time stamp DTS and the system clock STC are similar to each other, Decoding is started and input and stored in the video signal area of the buffer memory, and a video having a predetermined number (expressed as g below) If the decoding time stamp DTS of the video signal is the same as the system clock STC, it starts outputting, outputs the video signal at regular intervals, and watches the video through the signal processing unit. There is a non-video period in which the video reproducing apparatus can not reproduce the video and waits without displaying the video. Since the video information of the changed broadcasting channel is inputted and the video can be viewed after a predetermined time, there is a broadcasting channel changing delay time 6, the conventional digital broadcasting receiver changes the broadcasting channel and sets the display screen as non-video, and the program specification information PSI is input over time, and the packet identification number PID is set, I-picture information following the sequence header of the picture stream is output, and the picture information is set in the picture information area N pieces of image information are inputted to the image information area, and decoding is started when the decoding time stamp DTS and the system clock STC are similar, g image signals are inputted and stored in the image signal area of the buffer memory, When the decoding time stamp DTS of the video signal becomes equal to the system clock STC, it starts outputting and outputs a video signal in accordance with the period 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.

As described above, when a digital broadcasting is received and an image is reproduced, the image can not be reproduced for a while when the broadcasting channel is changed. Therefore, in a conventional digital broadcasting receiving device, It changes the broadcasting channel and watches the new or changed broadcasting image after a certain period of time. The non-video period and the broadcast channel change delay time are very long as compared with the analog broadcast receiving apparatus. It is inconvenient because the waiting time is long in selecting the broadcast with the up-key, the down-key or the number-key.

In order to reduce the inconvenience described above, the present invention immediately video-decodes I-picture information input first for a selected broadcast channel, immediately outputs the decoded video signal, inputs N video information, And reduces the waiting time and the delay time due to the video signal delay of the video signal processing unit. The video signal is repeatedly output at a low speed so as to control the video decoding time to control the decoding time stamp of the video signal to be equal to the system clock. The video signal to be output first is output without passing through the video signal processing unit, And finally, the video signal processing unit is finally output. A plurality of reproduction channels capable of selecting and reproducing a plurality of broadcast channels and outputting a plurality of pieces of image information are provided and a candidate reproduction channel is set for one reproduction channel that is currently watching a broadcast, When the user selects a broadcast channel, the video information of the candidate playback channel is selected, and the video is decoded and watched. The playback channel continuously selected is selected to reduce the non-video period and the waiting time after the channel change is eliminated Reduce delay time.

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.

FIG. 1 is a block diagram of a video reproducing function of a conventional digital broadcasting receiver, and is a block diagram of a video reproducing function of a digital broadcasting receiver according to a first embodiment of the present invention.
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, the video information of the demultiplexer is read by changing the broadcast channel, and it is confirmed that the I-picture information is input first. The I-picture information starts to be stored in the video information area of the buffer memory. Immediately decoding the I-picture information input and stored in the video information area of the buffer memory for the first time and storing it in the video signal area of the buffer memory, the video signal inputted and stored in the video signal area is output immediately in accordance with the cycle of the system clock , And outputs it to the display processing unit without passing through the signal processing of the video signal processing unit and watches it on the display device. The B-picture information input next to the first I-picture information is ignored and not decoded, and normally reproduced from the next I-picture information or 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. In order to reduce the channel change delay due to the delay of the signal processing unit 120 composed of the video signal processor and the graphic processor, the first output video signal is directly output without passing through the video signal processor. 5, the image signal processor 520 includes image signal buffers 521, 522, 523 and 524, signal processing stages 531, 532, 533 and 534, and a selector 530. FIG. 5 shows a four-stage video signal processor, and the 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. Process 2 (532) processes the video signal of the buffer 2 (522), outputs the input 3 before one video period, 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. The four-stage video signal processor as shown in FIG. 5 can control the delay of four video images. Hereinafter, the delay control capability of the video signal processor is denoted by x, and the delay control capability x = 4 of the video signal processor of FIG. . The graphic processor 540 of FIG. 5 outputs the final image signal in which the image and the graphic image are superimposed by superimposing the image signal and the graphic image signal. The graphic processor 540 includes an image superimposer 541 and a graphic generator 542. The graphic generator 542 receives information such as a partial image, point, line, surface, And outputs the superimposed ratio r to the image superimposer 541. The superimposer 541 superimposes the image signal ia and the graphic image signal ja on the image superimposed on the image signal ia, (1-r) + ja * r, etc., and outputs it as a final video signal, thereby minimizing 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 broadcast channel is changed, the final video of the entire broadcast channel is repeatedly output and outputted as a still image, and the transport stream of the changed broadcast channel is input to read the program specification information PSI The PID of the video information and the audio information is set in the demultiplexer. When the I-picture information is input, the video signal is immediately decoded to output the video signal as much as N + g + x video periods, The N image information in the image information area of the buffer memory and g image signals in the image signal area are filled and the image signal processor is normally reproduced while the delay control of the image signal processor is completed. Since the image is repeatedly output and reproduced at a rate of p pictures, the image is reproduced normally after outputting N + g + x + p images.

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, the decoded video signal is input to and stored in the video signal area of the buffer memory 215, and the decoded video signal is output at a constant cycle 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. Previously, the tuner of the playback channel can select the same or another broadcast channel. That is, if there is a broadcast program multiplexed on one broadcast channel, the tuner selects the same broadcast channel, and the demultiplexer can select another program.

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-reproduction channel selects the broadcast channel of the tuner of the next-reproduction channel in accordance with the order stored in the control unit, reads the program-specification information PSI to the next-reproduction channel, and transmits the packet identification number PID To select the program, wait for the video information of the next-reproduction channel to be input, and prepare for the selection of the next-reproduction 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 the previous broadcast is reproduced as a still image until a broadcast channel is changed and I-image information is input. However, before the I- The video information selector 218 selects and outputs the video information of the previous reproduction channel to reproduce the video of the entire broadcasting channel normally. When the I-video information is outputted to the changed reproduction channel, the video information selector 218 selects And outputs the I-picture information. At this time, the picture information is decoded and the picture signal is outputted and reproduced as described above. 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.

3 shows a third embodiment of the present invention in which a broadcast channel of a reproduction channel 1 330, a reproduction channel 2 340, and a reproduction channel 3 350 composed of a tuner, a demodulator and a demultiplexer is received The video buffer controllers 313a, 313b and 313c output the video information to the respective video information areas of the buffer memory 315 The video information input and stored in the video information area is selected by the video information selector 318 and is decoded by the video decoder 314 and the decoded video signal is stored in the video signal area of the buffer memory 315, And outputs the video signal inputted and stored in the video signal area at a predetermined cycle 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 video information of the different-reproducing channel is selected by inputting the up-key or the down-key, the video signal area of the buffer memory 315 is empty leaving only the video signal of the final video of the entire broadcast, Video information is stored in the video information area of the other-reproduction channel, and the decoding time stamp DTS finds the I-picture information closest to the system clock STC and starts to decode video, and the video signal area of the buffer memory 315 And the selector 530 of the video signal processor 520 of the signal processing unit 320 selects the input 1 and outputs the selected input. If (DTS-STC + g) is negative with respect to the decoding time stamp DTS of the video information, the B-picture information is skipped without decoding, the next video information is decoded and reproduced at a high speed, and the decoding time stamp DTS (DTS-STC + p) / p times, and reproduces at a low speed when the DTS-STC is positive. 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. The next-to-be-reproduced channel and the selected video buffer controller are reset by selecting the next-to-be-reproduced channel, the broadcast channel is selected, and the program identification information PSI is read to set the packet identification number PID of the video information and audio information in the demultiplexer Selects the program of the broadcast channel, waits for the video information of the next-reproduction channel to be input, stores it in the video information area of the buffer memory 315 from the I-picture information, and waits for selection. 6 (3), if the channel is changed, the final image of the entire broadcast channel is output as a still image, and the decoding time stamp DTS is stored in the video information area of the changed reproduction channel closest to the system clock STC Video information is selected and decoded and a video signal is output so that a final image of the entire broadcast channel is reproduced as two images and the video of the changed broadcast channel is viewed and the time for fast or slow reproduction is shortened, The video buffer of the video signal area of the memory is filled, the video signal processor performs delay control, and the video signal processor is normally reproduced while the delay control of the video signal processor 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.

Alternatively, in the first, second, third, and fourth embodiments, if the decoding time stamp DTS of the video signal and the system clock STC (DTS-STC) are positive, The control of the low-speed reproduction or the high-speed reproduction is relaxed beyond the video signal to be outputted in a constant cycle, so that the control can be performed for a long time and close to normal reproduction and natural. If DTS-STC is followed by a constant image period p, if it is positive, it will skip one image after progressing the p image. Thus, the decoding timestamp and the system clock can be coincided for a long time.

The buffers 521, 522, 523 and 524 of the video signal processor 520 of FIG. 5 can use a certain area of the buffer memories 115, 215, 315 and 415, 4 control units 116, 216, 316, and 416 control the input / output of the video signal processor.

In the first, second, third, and fourth embodiments described above, the system clock can be set to an absolute time, and can be controlled in synchronization with the time stored in the time information of the broadcast information of the broadcast channel. When the image is synchronized with the system clock of the absolute time, the time for buffering the image information and the video signal is largely 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 image reproducing apparatuses having the two reproduction channels in the second, third, and fourth embodiments, the second reproduction channel is selected for the first reproduction channel that is currently being viewed by the up-key or the down- Plays the channel. If the second playback channel is selected and viewed by inputting the up-key or the down-key, the same key is input to the first playback channel to reproduce the selected broadcast channel. If an up-key or a down-key is input and a broadcast channel other than the broadcast channel to be reproduced on the second reproduction channel is selected and viewed, the second broadcast channel is reproduced and the same key is input again. In the second, third, and fourth embodiments, since the broadcasting channel image is directly changed by inputting the up-key or the down-key, when the user presses the up-key or the down- , M (i), M (i + 1), and M (i + 1) by changing the reproduction channel at a predetermined time (set longer than the minimum time for the reproduction channel to change the broadcasting channel and detecting the video information) , M (i + 2) ..., or in reverse order. Also, the user can select a broadcasting channel by selectively inputting 10 keys of numbers 0, 1, 2, 8, and 9. The reproduction channel of the currently viewed broadcast channel is the first reproduction 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. In the video playback apparatus having two playback channels, the second playback channel inputs and reproduces the broadcast channel of the input number MX for the first playback channel currently viewed, and waits for the next number to be input or to terminate the number. When the number input ends, the second reproduction channel is selected and viewed. That is, if the second playback channel is selected by waiting until the input of the number is finished, the second playback channel outputs a stable image and immediately watches.

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, since it is not possible to display the broadcast program information for which the broadcast program information is not input because the broadcast information can not be collected, the broadcast program information is read by selecting a broadcast channel on a different playback channel with respect to the first playback channel, Collect. While the program information is being displayed, the broadcast channel is not changed / changed for viewing. Therefore, the broadcast channel of another reproduction channel may be changed to collect and display the broadcast information. When the collection of the broadcast program information of all the broadcast channels is completed or the display of the broadcast program information is completed, the second and third reproduction channels immediately prepare for the input of the up-key and the 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.

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 (29)

(a) a playback channel step of outputting video information;
(b) storing the image information in an image information area;
(c) inputting video information stored in the video information area and storing the video signal decoded in the video signal area;
(d) outputting the video signals stored in the video signal area in order of watching or repeatedly outputting the video signals intermittently outputted before, and outputting the video signals at regular intervals; And reproducing the image.
(a) a plurality of reproduction channel steps for outputting respective image information;
(b) selecting one image information from among the plurality of image information and storing the selected image information in an image information area;
(c) inputting video information stored in the video information area and storing the video signal decoded in the video signal area;
(d) outputting the video signals stored in the video signal area in order of watching or repeatedly outputting the video signals intermittently outputted before, and outputting the video signals at regular intervals; And reproducing the image.
delete (a) a plurality of reproduction channel steps for outputting respective image information;
(b) storing the plurality of pieces of image information in respective image information areas;
(c) selecting one of the plurality of image information stored in the respective image information areas;
(d) selecting the selected video information, or selecting the next video information if the selected video information is B-video information, and storing the video signal decoded by inputting the video signal in the video signal area;
(e) outputting the video signals stored in the video signal area in the order of watching or outputting the video signals of the next order, or intermittently outputting the video signals output previously and repeatedly outputting them at regular intervals ; And reproducing the image.
delete (a) a plurality of reproduction channel steps for outputting respective image information;
(b) storing the plurality of pieces of image information in respective image information areas;
(c) selecting respective pieces of image information stored in the plurality of image information areas, or, if the selected image information is B-image information, selecting the next image information, Storing in a signal area;
(d) outputting the video signals stored in the respective video signal areas in the order of watching or outputting the video signals of the next order, or intermittently outputting the video signals which have been outputted intermittently. Outputting the respective video signals at regular intervals;
(e) selecting one video signal out of the plurality of video signals outputted at the predetermined period and outputting the selected video signal; And reproducing the image.
delete delete delete delete The method as claimed in claim 1, 2, 4, or 6, wherein, when video is firstly decoded by changing the video information for the first time to view a broadcast or change a broadcast channel, a decoding timestamp and a system clock The difference between the predetermined value N and the number XT of effective image information input and stored in the image information area is decoded from the small I-image information, and the image signal obtained by video decoding the first image information is stored in the image signal area If the decoding timestamp is invalid or the system clock is invalid, decoding control is performed so that MD = (N-XT) approaches zero. If the decoding timestamp and the system clock are valid, The decoding time stamp DTS and the system clock STC are decoded so that MD = (DTS-STC + g) approaches 0, and the decoding time stamp DTS of the video signal to be output is The system clock STC, and controlling the output of the video signal by controlling MM = (DTS-STC) to be zero.
delete 12. The method of claim 11, wherein if the MD is negative, the B-picture information is skipped without decoding and the next video information is decoded. If the MD is positive or the MM is positive, And if it is negative, the next video signal is outputted and controlled beyond the video signal to be outputted.
12. The method according to claim 11, wherein if MM is positive, one video signal is repeatedly output at a predetermined number of video periods, and if MM is negative, video signals to be output in a predetermined number of video periods are output, Way.

delete delete delete delete delete delete delete delete delete delete delete delete delete delete delete

Images