KR20010002438A - Receiving system and method for selective decoding and multiple display to digital television - Google Patents

Abstract

PURPOSE: A digital TV receiving system for selective decoding and multi-screen and the method is provided to reduce an amount of calculation according to a size and a shape of a screen and decode selectively the image by decoding information on a plurality of digital and analog broadcastings and a DVD and outputting a multi-screen. CONSTITUTION: The digital TV receiving system for selective decoding and multi-display and the method includes a channel receiving terminal(31). A de-packet unit(32) receives information on a digital broadcasting, a cable TV and a DVD from a PCI bus(1) etc. and divides the information into three data(audio/video/user) for decoding. A process determining unit(33) determines whether the data is transmitted or not in order to process the data(audio/video/user) according to a control signal. First and second A/D converting units(ADC, 34,35) converts the analog video signal and audio signal from the channel receiving terminal(31) into digital signals. An analog video decoder(AVD, 36) decodes the video signal output from the first A/D converting unit(34). An AC-3 decoder(37) decodes the audio signal from the second A/D converting unit(35) and then outputs the decoded signal.

Description

RECEIVING SYSTEM AND METHOD FOR SELECTIVE DECODING AND MULTIPLE DISPLAY TO DIGITAL TELEVISION

The present invention relates to a digital TV reception system and method for selective decoding and multiple display, and more particularly, to receive and decode a plurality of digital broadcast, analog broadcast and DVD information, and to use a Vesa Video Interface Port, Multi-screen information is outputted through "VIP", PCI, etc., and a method for reducing the amount of calculation according to the size and shape of the screen and a selective decoding and multiple display for selectively decoding the image The present invention relates to a digital TV receiving system and method.

1 is a block diagram showing the configuration of an audio / video decoder of a conventional digital TV. As shown in the figure, audio / video decoding is performed, and a standard definition (hereinafter, abbreviated as "SD") level single screen is output through VIP. Cable TV information is input through IEEE 1394 (16). The 8-bit transport stream (hereinafter, abbreviated as "TS"), which is broadcast information, is received from the channel receiving end 10, and the de-packet section 11 is referred to as high definition (HD). Receives the screen information of abbreviated) class, converts it into SD class, decrypts it, and outputs the screen by Y / C video and VIP.

That is, video information output from the de-packet unit 11 is separately transmitted to the SD video decoder 12, audio information is separately transmitted to the AC-3 decoding unit 13, and the SD video decoder 12 is inputted. After reducing the video information (HD) to SD level information, the format conversion unit 14 converts the information to 480I (480 Interlaced) screen information (VIP.x) and outputs the information (VIP.x). It is processed by the graphic processing stage 20 and output to a PC monitor. The AC-3 decoding unit 13 decodes the input audio signal and transmits the pulse code modulation (hereinafter, abbreviated as "PCM") to the graphic processing unit 20 through the digital analog converter 15. Output

In addition, FIG. 2 is a block diagram illustrating a conventional video decoder of a digital TV. Unlike the audio / video decoder, as shown in FIG. 2, the video decoder has only a video decoding function. There are considerations for the input and output of analog signals such as NTSC, which are not used, and the main controller (hereinafter, abbreviated as "MCU") is controlled to output the screen and audio directly to the TV receiver.

This will be described in detail with reference to the accompanying drawings.

TS information of 8 bits is received from the channel receiving end 22 and decomposed into information easily deciphered by the de-packet unit 23, decoded by the MPEG-2 video decoder 24, and decoded by the format conversion unit 25 to 480I or It is converted into screen information of type 1080I and output to the TV receiver. In this case, audio information is required to be processed using a separate chip (not shown), and the MCU 30 processes information such as channel conversion. In addition, the PIP is processed, but the multi-screen display is not in progress.

As described above, the conventional technology does not support decoding and display of multiple screens, and there is no function to reduce the amount of calculation for decoding and format conversion according to the horizontal and vertical resolution of the screen to be displayed. There was a problem that there is no function to selectively decipher the contents of the program according to the rating region table.

Accordingly, the present invention has been devised to solve the above-mentioned conventional problems, and receives and decodes a plurality of digital broadcast, analog broadcast and DVD information, and multi-screen information such as VIP and PCI. The purpose of the present invention is to provide a method for reducing the amount of calculation according to the size and shape of the screen and a system and method for selectively decoding an image.

1 is a block diagram showing the configuration of an audio / video decoder of a conventional digital TV.

Figure 2 is a block diagram showing the configuration of a video decoder of a conventional digital TV.

Figure 3 is a block diagram showing the configuration of one embodiment of a digital TV receiving system for the selective decoding and multiple display of the present invention.

4 is a flow chart showing the operation of the present invention.

5 is an exemplary view showing a screen according to a display mode applied to the present invention.

*** Explanation of symbols for the main parts of the drawing ***

31: Channel receiving end 32: De-packet part

33: processing decision unit 34, 35: ADC

36: AVD 37: AC-3 Decoder

38: DAC 39: PCI controller

40: analog caption decoder 41: caption decoder

42,43: first and second information deletion detection unit 44: MPEG video decoding unit

45: format conversion unit 46: analog encoder

47: I ² C controller 48: graphics processing stage

In order to achieve the above object, a configuration of a digital TV reception system for selective decoding and multiple display includes: a de-packet unit for receiving various TV information and separating each data into predetermined data for decoding; A processing decision unit for determining whether to transmit to the next stage to process the output of the de-packet unit according to a control signal; A plurality of A / D converters for converting the transmitted analog video and audio signals into digital signals; An analog video decoder for decoding a video signal among the outputs of the plurality of A / D converters; An AC-3 decoder for decoding and outputting an audio signal of an output of the A / D converter according to the determination of the processing decision unit; A D / A converter which receives the output of the AC-3 decoder and converts the output into a digital signal; A PCI controller which transmits user data transmitted from the processing decision unit to a host through a PCI bus, and outputs DVD information transmitted from the PCI bus to the de-packet unit; A caption decoder for decoding caption information on the sub-screen transmitted from the processing decision unit; An analog caption decoder for decoding and outputting analog caption information of a sub-screen among the outputs of the A / D converter; First and second information deletion detection units detecting whether there is partial deletion in the video information transmitted from the de-packet unit or the analog caption decoder; An MPEG video decoding unit converting the predetermined information deletion detection unit into a predetermined format according to the output of the detection signal; A format converter for bypassing or converting video information transmitted from the MPEG video decoding unit into a predetermined format according to the output of the second information deletion detecting unit; An analog encoder for outputting video information transmitted from the format converter to interface with an analog TV; Characterized in that it comprises a screen determination unit for determining the sharpness of the output screen according to the user's selection.

In the method, the method further comprises: a first step of receiving information of the selected channel, decoding the display information according to a predetermined value, and then determining whether there is a channel change request; A second step of returning to the first step after receiving the information of the new channel if there is a channel change request as a result of the determination of the first step; A third step of determining whether there is a mode change request if there is no channel change request as a result of the determination of the first step; A fourth step of setting each component to a new mode, reconfiguring a screen, and returning to the first step if there is a mode change request as the determination result of the third step; A fifth step of determining whether there is a screen size adjustment request if there is no mode change request as a result of the determination of the third step; A sixth step of determining whether the difference between the input and output horizontal and vertical resolutions of the screen is more than two times if the determination result of the fifth step is not present; And a seventh step of returning to the first step after deleting the partial information having a different size as a result of the determination of the sixth step.

Hereinafter, an embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a block diagram showing an embodiment of a digital TV receiving system for selective decoding and multiple display of the present invention. As shown therein, digital broadcasting information, a cable, and the like from a channel receiving end 31 and a PCI bus 1 are shown. De-packet unit 32 which receives TV information and DVD information and separates it into three types of data (audio / video / user) for decoding, and processes the data (audio / video / user) according to a control signal. A processing decision unit 33 for determining whether to transmit to the next stage, and first and second A / D converters (ADC) for receiving analog video signals and audio signals from the channel receiver 31 and converting them into digital signals. 34, 35, an analog video decoder (AVD) 36 for decoding the video signal output from the first A / D converter 34, and a second A / according to the decision of the processing decision unit 33; From D conversion part 35 An AC-3 decoder 37 for decoding and outputting an audio signal, a D / A converter 38 for receiving the output of the AC-3 decoder 37 and converting the signal into a digital signal and outputting the digital signal; The user data transmitted from the unit 33 is transmitted to the host via the PCI bus 1, and the DVD information transferred from the PCI bus 1 is transferred through the processing decision unit 33 to the de-packet unit 32. PCI control unit 39 for outputting the data, the caption decoder 41 for decoding caption information for the sub-screen transmitted from the processing determination unit 33, and the first A / D conversion unit 34 Detect analog caption decoder 40 for decoding and outputting analog caption information for the sub-screen, and detecting video information (digital and analog partial deletion) transmitted from the de-packet unit 32 or analog caption decoder 40. First and second information deletion detection units 42 and 43 and the first information deletion feeling The MPEG video decoding unit 44 converts and outputs the MPEG video decoding unit 44 into a predetermined format according to the output of the detection signal of the unit 42 and the MPEG video decoding unit 44 according to the output of the second information deletion detecting unit 43. To interface (I / F) the analog TV with a format converter 45 for bypassing the transmitted video information or converting the video information into a predetermined format and outputting the video information (analog) transmitted from the format converter 45. And an analog encoder 46 for outputting it, and an I ² C controller 47 for determining the sharpness of the output screen according to a user's selection.

Referring to the accompanying drawings, the operation of an embodiment according to the present invention configured as described above will be described.

As shown in FIG. 3, when a user applies power to a digital TV using a remote controller or the like, the channel receiver 31 of the digital TV selects a broadcast of a corresponding channel to receive information (information of cable TV through IEEE 1394 and DVD reception via PCI is also possible).

The digital TV reception information is converted into TS and separated into video / audio / user data in the de-packet unit 32, respectively, and decrypted through a separate process.

That is, the video data may be composed of DTV / DVD / analog signals, read to fit the output control signal, and output to VIP and PCI.

The audio data is input to an audio decoder, decoded to match the output control signal, and output to match the motion of the screen.

The user data is inputted to the central processing unit (hereinafter, abbreviated as "CPU"), decrypted, and output to fit the screen. At this time, the CPU performs the OSD function to decode user data on the main screen and output it as a separate screen. That is, the caption information of the sub screen may be output as a VIP and processed by itself so that the caption information of the sub screen may also be displayed on the screen.

In addition, the video / audio / user data is transmitted or deleted from the de-packet unit 32 to the next stage according to the RRT information. When the video / audio / user data is deleted, related information is transmitted to the processing decision unit 33 and the CPU. That is, if the horizontal and vertical resolutions of the input screen are more than twice as large as the horizontal and vertical resolutions of the output screen, decoding is performed while removing part of the input and format conversion is performed.

When described in detail with reference to Figure 4 attached to the above operation process as follows.

FIG. 4 is a flowchart illustrating the operation of the present invention. As shown in FIG. 4, when the TV function is enabled, information about a selected channel is received and selectively processed according to a display mode selected by a user. The mode is set by the user's request. The types of screens supported are as follows.

Mode A0: HD DTV 1 Stream

Mode A1: SD DTV 1 Stream

Mode A2: SD Class DTV Multi Stream

Mode A3: SD DTV Stream & DVD Stream

Mode A4: SD DTV Stream & Analog Stream

Mode A5: DVD Stream & Analog Stream

Mode A6: DVD only

Mode A7: analog only

The size of the screen depends on the resolution of the monitor, and even if the screen supports XXGA level, some screens such as 1080T / 720P are clipped. Feedback). The input accepts both ATSC 18 format, DVD and NTSC / PAL formats, and the output supports 16 modes with arbitrary resolutions. That is, when A = 0, the mode is 00 to 07, and when A = 1, the mode is 10 to 17 mode. If A is '0' in mode Ax value, it means disable of PCI output, '1' means enable. The output proceeds to VIP and PCI. In case of PCI, it outputs only SD level information, and VIP supports all 16 modes. However, if the resolution of the output screen does not fully support the bandwidth of the VIP, the screen information corresponding to the output screen size is output by removing some screen information during format conversion.

When the user sets the mode A1 as the default, the mode A2 to A5 supports multiple screens, and thus, whether to perform a pip or a multi display is designated. By default, when the pip is set, the pip screen is displayed at 240 × 360, 30 frames / sec type on the bottom right of the entire TV.

Thereafter, it is determined whether there is a channel change request from the remote controller or the like, and if the channel change request is found as a result of the determination, the request is transmitted to the processing decision unit 33 through the PCI controller 39. The PCI data is converted into a predetermined format by the de-packet unit 32 and fed back to the channel receiving end 31. The channel receiving end 31 receives the new channel information based on this information, and then outputs it to the processing decision unit 33 again.

However, if there is no channel change request as a result of the determination, it is determined whether there is a mode change request. If the mode change request is determined, one of the following modes is selected and changed.

Change 1: single display mode PIP display mode

Change 2: single display mode POP display mode

Change 3: single display mode Multiple display mode

Change 4: Pop Display Mode Single display mode

Change 5: Pop Display Mode Pip display mode

Change 6: Pop Display Mode Multiple display mode

Change 7: Multiple Display Mode Single display mode

Change 8: Multiple Display Mode Pip display mode

Change 9: Multiple Display Mode Pop display mode

In the above, the single, pip, pop, and multiple displays are divided as shown in FIG. 5. In the single display mode, information is output through the VIP or the PCI, and when the VIP is selected, the mode of the VIP according to the resolution (mode I, II, III). The pip display mode and the pop display mode are also the same.

However, in the case of the multi display mode, the control sequence is changed according to the resolution of the main screen. When the resolution is HD, there are a maximum of 2 possible screens, one is output through VIP, and the other is through PCI. Output If the resolution is SD class, up to 4 can be output by VIP, and when requesting 60 frames / sec screen, it can output 2 by VIP and 1 by PCI.

If it is determined that there is no mode change request, it is determined whether there is a screen size adjustment request. If there is no screen size adjustment request, the screen returns to the beginning. Proceed. If the horizontal and vertical resolutions of the output screen are less than half the resolution of the input screen, the feedback is performed, and then the decoding is performed by removing some column or row information. Subsequently, an additional format conversion is performed based on the video data decoded by the format conversion unit 45. However, if the horizontal and vertical resolution of the input screen information is less than twice the horizontal and vertical resolution of the output screen, decoding and format conversion are performed without removing the information.

In addition, there are two methods of removing the input information. The first method is to proceed to 8 × 4, etc., instead of proceeding to 8 × 8 when processing an Inverse Discrete Cosine Transform (IDCT) block. The second is to completely remove pixel information corresponding to integer multiples. The problem of synchronization (SYNC.) For this is solved using the PTS and DTS information in the MPEG stream.

And, if you do not decode some video screens, and if you perform selective decoding to watch (for example, to prevent some inappropriate videos from being viewed by minors), first initialize the viewer's desired RRT rating and then set the default to 5. Then, the de-packet unit 32 retrieves the RRT information from the PSIP information and deletes all information transmitted to the de-packet unit 31 when the RRT information exceeds the RRT level designated by the viewer. The processing result is transmitted to the analog video 36, the AC-3 decoder and the CPU through the I ² C control unit 47 and the PCI bus.

The analog video decoder 36 displays a preset guide text on the screen or continuously displays the previous screen. In the case of the AC-3 decoder 37, the decryption operation is stopped, and the user data displays the previous contents as they are.

The de-packet unit 32 continuously retrieves the RRT information, and when information in the grade is input, the de-packet unit 32 transmits information necessary for previous decoding to the next stage. After that, the next stage receives the new decryption work. In this case, the analog video decoder 36 does not perform decoding until the I-picture information is input in order to prevent distortion of the screen.

As described above, the digital TV receiving system and method for selective decoding and multiple display of the present invention can receive digital, analog TV and DVD on a single chip, thereby reducing the size of the device and supporting multiple decoding and display. Various systems can be configured, and when the difference between the horizontal and vertical resolutions of the input screen and the horizontal and vertical resolutions of the output screen is more than doubled, the calculation amount for decoding and format conversion is reduced, thereby reducing the overhead in hardware configuration. In addition, when watching with a minor, when there is inappropriate content, it is possible to remove and display some images according to the user's selection, so that the family can watch at the same time.

Claims (2)

A de-packet unit which receives various TV information and separates each piece into predetermined data for decoding; A processing decision unit for determining whether to transmit to the next stage to process the output of the de-packet unit according to a control signal; A plurality of A / D converters for converting the transmitted analog video and audio signals into digital signals; An analog video decoder for decoding a video signal among the outputs of the plurality of A / D converters; An AC-3 decoder for decoding and outputting an audio signal of an output of the A / D converter according to the determination of the processing decision unit; A D / A converter which receives the output of the AC-3 decoder and converts the output into a digital signal; A PCI controller which transmits user data transmitted from the processing decision unit to a host through a PCI bus, and outputs DVD information transmitted from the PCI bus to the de-packet unit; A caption decoder for decoding caption information on the sub-screen transmitted from the processing decision unit; An analog caption decoder for decoding and outputting analog caption information of a sub-screen among the outputs of the A / D converter; First and second information deletion detection units detecting whether there is partial deletion in the video information transmitted from the de-packet unit or the analog caption decoder; An MPEG video decoding unit converting the predetermined information deletion detection unit into a predetermined format according to the output of the detection signal; A format converter for bypassing or converting video information transmitted from the MPEG video decoding unit into a predetermined format according to the output of the second information deletion detecting unit; An analog encoder for outputting video information transmitted from the format converter to interface with an analog TV; A digital TV receiving system for selective decoding and multiple display, characterized in that it comprises a screen determination unit for determining the sharpness of the output screen according to the user's selection. A first step of receiving and decoding information on the selected channel, displaying the information according to a preset value, and then determining whether there is a channel change request; A second step of returning to the first step after receiving the information of the new channel if there is a channel change request as a result of the determination of the first step; A third step of determining whether there is a mode change request if there is no channel change request as a result of the determination of the first step; A fourth step of setting each component to a new mode, reconfiguring a screen, and returning to the first step if there is a mode change request as the determination result of the third step; A fifth step of determining whether there is a screen size adjustment request if there is no mode change request as a result of the determination of the third step; A sixth step of determining whether the difference between the input and output horizontal and vertical resolutions of the screen is more than two times if the determination result of the fifth step is not present; And a seventh step of returning to the first step after deleting the partial information having a different size as a result of the determination of the sixth step.