KR100275698B1 - Digital television for playing program streams and digital video disc player systems having the same - Google Patents

Abstract

The present invention relates to a digital television for playing a program stream and a digital video disc player system having the same, the system comprising: a DVDP unit; DTV unit; And an IEEE 1394 bus providing a connection path for transmitting and receiving data between the DVDP unit and the DTV unit. The DVDP unit includes an optical signal processing unit for demodulating the optical signal picked up from the optical disc to generate program stream data; A first link unit for converting program stream data into an IEEE 1394 packet, performing management of error detection bus cycles, and performing insertion / removal of an IEC 61883 CIP header; And receiving a bit string from the link layer at the time of transmission, obtaining a right to use the IEEE 1394 bus, encoding the same, converting the signal into an electrical signal, and transmitting data on the bus. The DTV unit includes a first physical unit, and the DTV unit receives and decodes a program stream received from the DVDP unit by using the IEEE 1394 protocol to output audio, video, and digital data, and transmits the user's control command to the DVDP unit according to the IEEE 1394 protocol. PS processing unit for transmitting; A microcontroller that extracts and interprets navigation information from program stream data delivered from the DVDP unit, and delivers user input information to the DVDP unit; And a TS processor for selecting and demodulating a desired frequency band from a transport stream to output audio, video, and digital data.

Description

Digital television for playing program streams and digital video disc player systems having the same

The present invention relates to a digital video disc player, and more particularly to a digital television (DTV) for playing a program stream and a digital video disc player system having the same.

In general, a digital video disk player (hereinafter referred to as a DVDP) converts a video signal decoded by an audio / video decoder in which a bitstream is embedded into an analog TV signal by an NTSC encoder. The TV only performs a passive receiver function.

1 is a block diagram illustrating a configuration of a general DVDP, which will be described below. The spindle motor SP 100 is responsible for the rotation of the disk 110. Pick-up (PU) 105 receives the reflected light when the laser light is output to read data from the DVD (Digital Video Disk, 110). There is also a deck mechanism (not shown) which is a mechanism for conveying and loading discs.

The RF & servo control unit 115 can accurately read data from the disc reproducing unit and the disk 110, such as amplifying the RF signal from the optical pickup 105, removing noise, digitizing an analog signal, and sync detection. It includes a servo control unit for signal reproduction such as disc rotation control, focusing of pickup and tracking control. The servo control unit is controlled by the microcontroller 130. The signal output from this block outputs the EFM signal to the data processor 120.

The data processor 120 demodulates the EFM signals of the CD and the DVD output from the signal reproducing unit 115 and performs data PLL, descrambling, error detection / correction, memory control functions, etc., by sync detection. Have The memory control unit stores the decoded data in the buffer 125 for a while after the data rate of the signal input from the disk is greater than or equal to the transmission rate output from the data processor to the MPEG decoder unit 150. The data is transmitted in accordance with the request of the audio / video decoder. Therefore, such a series of processes are performed such that memory overflow and underflow do not occur under the control of the microcontroller 130. In addition, it provides a function that the microcomputer 130 can read by detecting a control data sector included in the DVD stream.

The data output from the data processor 120 may be scrambled data to prevent digital copying depending on the disk. In this case, it is descrambled by the CSS (Content Scramble System) decoder 152 of the MPEG decoder unit 150. The descrambled stream is a program stream defined in MPEG. This program stream is composed of MPEG 1,2 video, MPEG audio, AC-3, DTS, Linear PCM, Sub Picture, and Navigation Pack.

The MPEG decoder unit 150 includes MPEG2, MPEG1 video decoding unit 154, linear PCM, DTS, AC-3 audio, MPEG audio decoding unit 156, subpicture decoder 158, audio having an On Screen display function, and the like. To configure a video decoding block. The system parser 152 classifies the type of input bitstream, that is, audio, video, subpicture, navigation pack, and the like, and the divided data is transmitted to each corresponding block for decoding. The decoded image data is mixed with the On Screen data and output to the video output unit 160, and the decoded audio data is output to the audio output unit 160.

The DRAM 165 is a video memory used by the MPEG decoding unit 150 to decode the bitstream. The Content Scramble System (CSS) block 152 of the MPEG decoding unit 150 is a block that descrambles scrambled content on a disk for digital copy protection. In addition to MPEG 1 and 2 moving pictures and AC-3 and MPEG audio, menus, subtitles, and the like appearing on the screen are displayed by subpictures.

2 shows a DVD bit stream structure. An NV Pack (Navigation Pack) is a data sector that contains various information capable of controlling a bitstream, for example, button information for a menu, information for selecting a High Light information angle, and audio and video synchronization information. V denotes an MPEG video pack, A denotes an audio pack such as MPEG or AC-3, DTS, and Linear PCM, and SP denotes a sub-picture data pack capable of displaying subtitles and menus.

In particular, the menu data displayed on the screen is composed of subtitles, which contain information such as the position of the buttons on the screen, the color, the number of buttons, the color when selected, and the color when executed. Displayed with reference to the control information. The microcontroller 130 allows the user to view a menu, receive a cursor movement key, a numeric key, and an enter key so that the user can play the disc as desired by the interface with the MPEG decoding unit 150.

The main microcontroller 130 reads the desired data on the disc by servo control, data search, and deck mechanism control, and prevents the OVER / UNDER FLOW of the VBR stream from occurring in the AV decoder by data processor control and track buffer management. send. Also, when playing a menu, etc., with the help of the AV decoder, the execution contents of the button selected by the user are found in the control information file (Navigation Information, Navigation Pack), and the corresponding action is performed. It is a microcontroller for system control that has a function of receiving remote control and front key input. The EEPROM 135 is a memory for storing a program.

The front controller 140 receives a user's control signal, that is, a remote controller and a player's front panel key, and transmits the received signal to the microcontroller 130 and displays a playback time on the VFD.

On the other hand, the above-mentioned DVDP does not have a digital interface such as IEEE 1394. Therefore, when connecting the DVDP with a display device such as a TV, an analog interface should be used. However, the analog interface has some problems.

First, the DVDP's remote control must be used for DVDP control, and the TV is just a display terminal. In addition, since the TV remote control is used for the function of the TV itself, when connecting multiple devices, multiple remote controls are required.

Second, even if the digital devices are connected, if the interface is analog, various network functions that the digital interface can provide cannot be realized.

If a digital interface such as IEEE 1394 is used as the interface, the above two problems can be solved. However, even with the assumption that IEEE 1394 is adopted, there are some problems in the nature of DVDP.

First, DTV is a receiver for receiving HDTV broadcasts and is designed to process a bitstream of MPEG2-TS format. However, DVD discs store bit streams in the form of MPEG2-PS, so when DVDP outputs MPEG2 streams through the IEEE 1394 interface, it is not possible to convert a program stream (PS) to a transport stream (TS) or to decode a program stream. It should have a separate program stream decoder that can do this.

Second, various types of navigation information are built into the DVD disc so that the stored bitstream data can be easily selected. This information is in the form of a sub picture, and for this purpose, a sub picture decoder must be built in the DTV. In order to prevent this, a method for constructing a menu screen using a sub picture decoder built by the DVDP and transmitting the same to a DTV should be developed.

In other words, the above-described DVD player is made for playback on a TV having an analog input, and since there is not enough consideration for the DTV, even if the DVDP and the DTV are connected using the IEEE 1394 interface, the DTV currently exists in the DTV. Standard DVDP playback is difficult. This difficulty is due to the difference between the format of MPEG2-PS, which is a bitstream recorded on a DVD disc, and MPEG2-TS, which is used for digital broadcasting.

SUMMARY OF THE INVENTION The present invention has been made in an effort to solve the above problems, and to provide a digital video disc player system having a DTV having a decoder capable of decoding a program stream in the DTV.

Another technical problem to be solved by the present invention is to provide a DTV which decodes a program stream and interfaces with an IEEE 1394 bus.

1 is a block diagram showing the configuration of a general DVDP.

2 shows a DVD bitstream structure.

FIG. 3 illustrates a protocol stack included in typical IEEE 1394 devices.

FIG. 4 is a block diagram showing the configuration of a digital video disc player system having an IEEE 1394 interface and having a DTV.

Fig. 5 is a flowchart showing the operation of the microcontroller of the DVD unit during menu reproduction.

6 is a flowchart showing the operation of the PS decoder of the DTV unit during menu reproduction.

According to the present invention for solving the above technical problem, a digital video disc player system having a DTV, in the DVDP system having a DTV connected via an IEEE 1394 bus, DVDP unit for reading the content of the optical disc from the optical disc ; A DTV unit for decoding and outputting the contents of the optical disc, selecting a desired program from an external transport stream and decoding the corresponding channel signal; And an IEEE 1394 bus providing a connection path for transmitting and receiving data between the DVDP unit and the DTV unit.

The DVDP unit includes an optical signal processing unit for demodulating the optical signal picked up from the optical disc and generating data in the form of a program stream; A first stream converts the data in the form of a program stream output from the optical signal processor into an IEEE 1394 packet, manages an error detection bus cycle, and performs insertion / removal of an IEC 61883 Common Isochronous Packet (CIP) header. A link unit; And receiving a bit string from the link layer at the time of transmission, obtaining a license of the IEEE 1394 bus, encoding the same, converting the signal into an electrical signal, and transmitting data on the bus, and performing a reverse process at the time of reception. It characterized in that it comprises a first physical part.

The DTV unit receives and decodes program stream data received from the DVDP unit by the IEEE 1394 protocol to output audio, video, and digital data, and transmits a user's control command to the DVDP unit according to the IEEE 1394 protocol. PS processing unit; A micro-controller that extracts and analyzes navigation information from data in the form of a program stream delivered from the DVDP unit, and delivers information input from a user to the DVDP unit; And a TS processor for selecting and demodulating a desired frequency band from a transport stream to output audio, video, and digital data.

The optical signal processor comprises a spindle motor for rotating the disk; An optical pickup for receiving the reflected light when the laser light is output to read data from the disk; An RF & servo control unit for reproducing the RF signal output from the optical pickup and performing servo control for reading data from the optical disk; Demodulates the signal output from the RF & servo control unit, and has a function of reading the control data sector included in the DVD stream with the data PLL, error detection / correction, and memory control functions by sync detection to read the microcontroller unit. Providing a data processor; And a microcontroller unit for controlling the optical signal processor for disc content reproduction including servo control, data search and deck mechanism control.

The PS processing unit receives the program stream data transmitted from the DVDP unit in the form of an electrical signal, converts it into a bit string, receives the bit string from the link layer during transmission, obtains a license of the IEEE 1394 bus, and then encodes the bit stream. A second physical unit which converts an electric signal and transmits data on a bus; A second link unit for converting data output from the DTV unit into an IEEE 1394 packet, managing an error detection bus cycle, and performing insertion / removal of an IEC 61883 Common Isochronous Packet (CIP) header; And a PS decoder which receives and decodes program stream data of a DVD from the second link unit and outputs audio, video and digital data.

Meanwhile, according to the present invention for solving the above technical problem, the DVT decoding the program stream receives the IEEE 1394 packet in the form of the program stream of the DVDP transmitted through the IEEE 1394 bus, and the IEEE for transmitting and receiving data with the DVDP. A 1394 interface unit responsible for the 1394 interface; A PS decoder for decoding data in the form of a program stream delivered through the 1394 interface unit; A micro controller which extracts and analyzes navigation information from data in the form of a program stream transmitted through the 1394 interface unit, and transmits information input from a user to the DVDP through the 1394 interface unit; A tuner for selecting a frequency band including a desired program from a transport stream transmitted; A channel decoder for demodulating the transport stream output from the tuner; And a TS decoder which decodes the transport stream output from the channel decoder into video data and audio data to decode the video signal and the audio signal.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Recently, various digital devices such as DTV, DVC, DVDP, and digital set-top box have appeared, and the IEEE 1394 approved by the IEEE committee has been spotlighted as their interface. FIG. 3 illustrates a protocol stack included in typical IEEE 1394 devices. The physical layer 300, which is the lowest layer, receives a bit string from the link layer 310, which is an upper layer, and acquires a right to use a serial bus. The bit string is then encoded and converted into an electrical signal to transmit data on the bus. In the case of reception, the reverse procedure in the transmission is followed. The link layer 310 handles data in units of packets and plays a role of constructing and decomposing packets, detecting errors, and managing bus cycles. The transaction layer 320 provides transactions such as read / write / lock, and performs asynchronous communication with other nodes on the 1394 bus by using a service provided by a lower layer.

When a plurality of devices are connected using the IEEE 1394, the IEEE 1394 specification alone is not sufficient for the actual transmission of data between devices. That is, a process for establishing a connection between devices to send and receive A / V data and an isochronous channel to transmit A / V data should be made between devices. The IEEE 61883 standard exists for this purpose.

In IEEE 61883, it can be said that a function control protocol (FCP, 330) and a connection management protocol (CMP, 330) are largely defined. The CMP 330 defines a structure of software for managing isochronous connections between devices, and the FCP 330 is for transmitting commands such as AV / C CTS (A / V Control Command and Transation Set). Provide a framework. Another feature of IEC 61883 is the definition of the Common Isochronous Packet (CIP) header structure. The CIP header contains information about the source stream contained in an isochronous packet.

The IEEE 1394 and IEC 61883 standards use control commands to control devices. The most representative control command is AV / C CTS. This method defines a hexadecimal code for each device function. For example, the Play command for the VCR is defined as "0xC8" in hexadecimal.

FIG. 4 is a block diagram showing the configuration of a digital video disc player system incorporating an IEEE 1394 interface and including a DTV for explaining an embodiment of the present invention. The DVDP unit 10 for reading data from an optical disc is shown in FIG. And a DTV unit 20 and an IEEE 1394 bus 30 from the DVDP unit 10.

The DVDP unit 10 includes an optical signal processing unit 400, a first link unit 430, and a first physical unit 440.

The optical signal processor 400 demodulates the optical signal picked up from the disk and generates the data in the form of a program stream.

The first link unit 430 converts the data in the form of a program stream output from the optical signal processor 400 into IEEE 1394 packets, manages bus cycles of error detection, and performs IEC 61883 CIP (Common Isochronous Packet). ) Insert / remove header.

The first physical unit 440 receives a bit string from the first link unit 430 when transmitting, acquires a right to use an IEEE 1394 bus, encodes it, converts it into an electrical signal, and transmits data on the bus. When receiving, the reverse process of the transmission is performed.

The optical signal processor 400 includes a spindle motor SP, 405, a pickup P / U, 410, an RF & servo controller 415, a data processor 420, and a microcontroller 425. The SP 405 is a motor that rotates the disk 427. The P / U 410 receives the reflected light when a laser light is output to read data from a digital video disk (DVD). And a deck mechanism (not shown), which is a mechanism for transporting the disk and loading the pickup.

The RF & servo control unit 415 can accurately read data from the disc reproducing unit and the disk 427 such as amplifying the RF signal from the optical pickup 410, removing noise, digitizing an analog signal, and sync detection. It includes a servo control unit for signal reproduction such as disc rotation control, focusing of pickup and tracking control. The servo controller 415 is controlled by the microcontroller 425. The signal output from this block outputs the EFM signal to the data processor 420.

The data processor (DSP) 420 demodulates the EFM signals of CDs and DVDs output from the signal reproducing unit, and has data PLL, descrambling, error detection / correction, and memory control by sync detection. . Since the data rate of the signal input from the disk 425 is greater than or equal to the data rate output from the data processor 420 to the MPEG decoding side, the decoded data is temporarily stored in a buffer, and then the audio / video decoder on the MPEG decoding side again. Data is transmitted in accordance with the request. Therefore, such a series of processes are performed such that memory overflow and underflow do not occur under the control of the microcontroller 425. In addition, it provides a function that can be read by the microcomputer by detecting a control data sector contained in the DVD stream.

The data output from the data processor 420 may be scrambled data to prevent digital copying depending on the disk. In this case, it is descrambled by the CSS (Content Scramble System) decoder 445. The descrambled stream is a program stream defined in MPEG. This program stream is composed of MPEG 1,2 video, MPEG audio, AC-3, DTS, Linear PCM, Sub Picture, and Navigation Pack.

The microcontroller 425 serves as a control for playing disc content including servo control, data search, and deck mechanism control.

The DTV unit 20 includes a PS processor 450, a microcontroller 460, and a TS processor 470.

The PS processor 450 receives and decodes program stream data received from the DVDP unit 10 by the IEEE 1394 protocol, outputs audio, video, and digital data, and transmits user control commands to the IEEE 1394 protocol. It is transmitted to the DVDP unit accordingly, and is composed of a second physical unit 472, a second link unit 474, and a PS decoder 476.

The second physical unit 472 receives the program stream data transmitted from the DVDP unit 10 in the form of an electrical signal, converts it into a bit string, receives the bit string from the link layer, and transmits the bit stream from the link layer. After obtaining the license, it is encoded, converted into an electrical signal, and transmitted on the bus.

The second link unit 474 converts the data output from the DTV unit 10 into an IEEE 1394 packet, manages an error detection bus cycle, and inserts an IEC 61883 Common Isochronous Packet (CIP) header. Perform the uninstall function.

The PS decoder 476 receives and decodes program stream data of a DVD from the second link unit 474 and then outputs audio, video and digital data.

The TS processor 470 selects and demodulates a desired frequency band of a transport stream to output audio, video, and digital data, and includes a tuner 452, a channel decoder 454, and a TS decoder 456.

The tuner 452 selects a frequency band including a desired program from a transport stream. The channel decoder 454 demodulates the transport stream output from the tuner 452. The TS decoder 456 decodes the transport stream output from the channel decoder 454 into video data and audio data to decode the video signal and the audio signal.

The microcontroller 460 extracts and analyzes navigation information from data in the form of a program stream delivered from the DVDP unit 10, and transmits information input from a user to the DVDP unit 10.

FIG. 5 is a flowchart illustrating the operation of the microcontroller of the DVD unit during menu playback. This will be described below. After playing the bitstream on the DTV (step 500), the user waits for a menu input from the user (step 510). The key is basically Up, Down, Left. ), Right, Enter, and Numeric keys. When the key is input, the microcontroller checks whether button information is received (step 520). If there is button information, the button information is read from the navigation buffer of the data processor and stored in the microcontroller (step 530). The information stored in the navigation pack includes the display start and end time, the number of buttons, the forced start time, Button display modes (16: 9, 4: 3, Letter Box), button offset values, button position information (button numbers on the top, bottom, left and right), commands corresponding to each button, and whether or not the selected button is automatically executed.

It is determined whether the input key is valid by referring to the information (step 540). Then, it is checked whether an enter key is received. (Step 550) When the received key is executed, the corresponding button command is executed and the corresponding location is played by referring to the navigation pack. If the enter key is not received, check whether it is an autorun key (step 570). If it is not an autorun key, find and remember the current position of the button in the navigation pack (step 580). If so, the operation 560 is terminated.

FIG. 6 is a flowchart illustrating the operation of the PS decoder of the DTV unit at the time of menu reproduction. The stream is decoded (step 600) and displayed on the screen (step 605). Then, it is checked whether there is button information (step 610), and if there is no button information, the operation is terminated. Step 615) First, it is checked whether there is a forced selection button (step 620). If there is no forced selection button, high light the corresponding button on the screen (step 625). (Step 630) If there is no key input, wait until there is a key input, and if there is a key input, check whether it is a selection movement key. (Step 635) If the selection moves key, find the selected button in the button position information and make it high light. If it is an auto execution key (step 655), if it is an auto execution key, it is set to a high light according to the color of the executed button (step 640). In step 635, if not the selection shift key, step 640 is performed.

If it is not the auto execution key in step 635, the LED is set to high light according to the color of the selected button (step 660). Then, the input button is notified to the DVD controller via IEEE 1394 (step 665). Check if there is any.

According to the present invention, a DVD player can be connected on a home network to freely play DVD content on a DTV.

Claims (7)

In a DVDP system having a DTV connected via an IEEE 1394 bus, A DVDP unit for reading contents of the optical disc from the optical disc; A DTV unit for decoding and outputting the contents of the optical disc, selecting a desired program from an external transport stream and decoding the corresponding channel signal; And And a IEEE 1394 bus providing a connection path for transmitting and receiving data between the DVDP unit and the DTV unit. The method of claim 1, wherein the DVDP unit An optical signal processing unit for demodulating the optical signal picked up from the optical disk to generate data in the form of a program stream; A first stream converts the data in the form of a program stream output from the optical signal processor into an IEEE 1394 packet, manages an error detection bus cycle, and performs insertion / removal of an IEC 61883 Common Isochronous Packet (CIP) header. A link unit; And Receives a bit string from the link layer during transmission, obtains a license of the IEEE 1394 bus, encodes it, converts it into an electrical signal, and transmits data on the bus. When receiving, the reverse process of the transmission is performed. DVDP system having a DTV, characterized in that it comprises a first physical unit. The method of claim 1, wherein the DTV unit A PS processor which receives and decodes program stream data received from the DVDP unit by using an IEEE 1394 protocol to output audio, video, and digital data, and transmits a user's control command to the DVDP unit according to the IEEE 1394 protocol; A micro-controller that extracts and analyzes navigation information from data in the form of a program stream delivered from the DVDP unit, and delivers information input from a user to the DVDP unit; And And a TS processing unit for selecting and demodulating a desired frequency band of a transport stream to output audio, video, and digital data. The method of claim 2, wherein the optical signal processing unit A spindle motor for rotating the disk; An optical pickup for receiving the reflected light when the laser light is output to read data from the disk; An RF & servo control unit for reproducing the RF signal output from the optical pickup and performing servo control for reading data from the optical disk; Demodulates the signal output from the RF & servo control unit, and has a function of reading the control data sector included in the DVD stream with the data PLL, error detection / correction, and memory control functions by sync detection to read the microcontroller unit. Providing a data processor; And And a microcontroller section for controlling the optical signal processing section for disc content reproduction including servo control, data search, and deck mechanism control. The method of claim 3, wherein the PS processing unit Receives the program stream data transmitted from the DVDP unit in the form of an electrical signal, converts it into a bit string, receives the bit string from the link layer during transmission, obtains a license of the IEEE 1394 bus, encodes it, and then converts it into an electrical signal. A second physical unit for converting and transmitting data on a bus; A second link unit for converting data output from the DTV unit into an IEEE 1394 packet, managing an error detection bus cycle, and performing insertion / removal of an IEC 61883 Common Isochronous Packet (CIP) header; And And a PS decoder which receives and decodes program stream data of a DVD from the second link unit and outputs audio, video, and digital data. The method of claim 3, wherein the TS processing unit A tuner for selecting a frequency band including a desired program among transport streams; A channel decoder for demodulating the transport stream output from the tuner; And And a TS decoder which decodes the transport stream output from the channel decoder into video data and audio data to decode the video signal and the audio signal. A 1394 interface unit which receives an IEEE 1394 packet in the form of a program stream of a DVDP transmitted through an IEEE 1394 bus, and is in charge of an IEEE 1394 interface for transmitting and receiving data with the DVDP; A PS decoder for decoding data in the form of a program stream delivered through the 1394 interface unit; A micro controller which extracts and analyzes navigation information from data in the form of a program stream transmitted through the 1394 interface unit, and transmits information input from a user to the DVDP through the 1394 interface unit; A tuner for selecting a frequency band including a desired program from a transport stream transmitted; A channel decoder for demodulating the transport stream output from the tuner; And And a TS decoder which decodes the transport stream output from the channel decoder into video data and audio data to decode the video signal and the audio signal.