KR20030092641A - Digital animation controller via network - Google Patents

Abstract

PURPOSE: A digital motion-picture controller through a network is provided to receive MPEG-2 motion-pictures with high picture quality on a network without using a tuner. CONSTITUTION: A digital motion-picture controller through a network includes an Ethernet interface(60) connected to the network, a medium access controller(50) for carrying out TCP/IP protocol, a packet filter controller(40), and a channel interface(30). The packet filter controller recognizes UDP packet data on a capsule data transmitted from the medium access controller to extract an MPEG-2 transport stream packet. The channel interface demodulates the MPEG-2 transport stream extracted by the packet filter controller through quadrature phase shift keying, quadrature amplitude modulation or coded orthogonal frequency division multiplexing. The channel interface has a frequency counter(32) for counting input frequency, a frame controller(34) having a FIFO memory, a data memory(38) for temporarily storing data generated from the packet filter controller, and a direct access memory controller(36) for controlling data flow to generate the MPEG-2 transport stream.

Description

Digital animation controller via network {Digital animation controller via network}

The present invention relates to a digital video control device through a network that separates a video stream from packet-encapsulated data transmitted from a network device. In particular, the present invention analyzes packets of digital data received on the Internet based on TCP / IP. The present invention relates to a digital video control apparatus via a network capable of extracting only MPEG-2 (hereinafter referred to as "MPEG-2") transport stream which is video data.

In general, digital video is theoretically free from noise in transmission and reception signals, and thus its use is gradually expanding. As a result of technology for compressing and modulating video such as MPEG-2, You can enjoy higher quality digital video.

1 is a block diagram showing a conventional configuration of a digital video control apparatus through a network. As shown in FIG. 1, a tuner 20 for receiving a downlink signal and converting it into an intermediate frequency signal, and demodulating an intermediate frequency signal. At the same time, a demodulator and error corrector 22 which performs error correction and the like to restore the original digital signal, and a burst modulator 28 which modulates the digital signal into an analog signal and transmits the data to the tuner 20 when data is transmitted upward. ), A time division multiple access media access controller (24) for allocating shared media to certain users at a given bandwidth, and an Ethernet interface (26) for sending and receiving data from a host.

In addition, the demodulation and error corrector 22 includes an A / D (analog / digital) converter (not shown), quadrature phase shift keying (QPSK), and quadrature amplitude modulation. MPEG frame synchronization with a demodulator (not shown) that modulates with Quadrature Amplitude Modulation (QAM), orthogonal coding frequency division multiplexing (COFDM), etc. It consists of a part (not shown) and an error correction part (not shown).

In the conventional video processing apparatus configured as described above, the tuner 20 converts a signal received through an external antenna or cable connected to the tuner 20 into a mid-band frequency signal, and then transfers the signal to an internal A / D converter or a headend. It plays a role of transmitting an uplink signal.

In addition, the received signal is modulated by quadrature phase shift modulation, quadrature amplitude modulation, orthogonal coded frequency division multiplexing, etc. according to the tuner 20, and then goes through a demodulation and error corrector 22. The demodulator and error corrector 22 In order to receive the downlink signal from the tuner 20 and to restore the original MPEG-2 transport stream digital signal.

In this case, in order to share the recovered MPEG-2 transport stream digital signal with a plurality of users, a limited medium and a frequency band are used, and a multiple access method for accommodating a plurality of users simultaneously is determined.

In addition, the media access controller 24 is a time-division multiple access method of scheduling by dividing the available frequency bands to be assigned to limited users during data transmission and the CSMA / CD in the IEEE 802.3 Ethernet interface 26. It would accept all of the usage rights competition schemes within a given bandwidth, and would be able to send and receive data to and from the host system via this Ethernet interface 26.

However, the conventional video control device has a complicated structure because it requires a tuner 20 for receiving a signal of a frequency modulation method along with an external connection of an antenna, a cable, etc. according to a medium, thereby increasing the equipment cost. There was this.

The present invention has been made to solve the above problems, and its object is to provide a network capable of receiving high-definition MPEG-2 video over a network without a medium such as a separate tuner in digital broadcasting such as satellite, cable, and terrestrial waves. To provide a digital video control device through.

In order to achieve the object of the present invention, the Ethernet interface unit connected to the network, the media access controller performing the TCP / IP protocol, and the UDP packet data on the packet data transmitted from the media access controller to recognize the MPEG-2 trans It consists of a packet filter controller which extracts the port stream packet, and a channel interface unit which demodulates and outputs the MPEG-2 transport stream extracted from the packet filter controller by quadrature phase shift modulation, quadrature amplitude modulation, orthogonal coding frequency division multiplexing. Provided is a digital video control apparatus via a network.

Figure 1 is a block diagram showing a conventional digital video control apparatus through a network

Figure 2 is a block diagram showing a digital video control device via a network according to the present invention

Figure 3 is a block diagram showing in more detail the digital video control device through a network according to the present invention

4 is a diagram illustrating a packet structure performed by a packet filter controller in a digital video control apparatus through a network according to the present invention.

* Explanation of Signs of Major Parts of Drawings *

60: Ethernet interface unit 50: media access controller

70: capsule data 86: UDP packet data

72: MPEG-2 Transport Stream Packet

40: packet filter controller 30: channel interface unit

32: frequency counter 34: frame controller

38: data memory 36: direct access memory controller

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

2 to 4, an Ethernet interface unit 60 connected to a network, a medium access controller 50 for performing a TCP / IP protocol, and a capsule transmitted from the medium access controller 50, as shown in FIGS. A packet filter controller 40 which recognizes the UDP packet data 86 on the data 70 and extracts the MPEG-2 transport stream packet 72; and an MPEG-2 transport stream extracted from the packet filter controller 40; And a channel interface unit 30 for demodulating and outputting the signal by quadrature phase shift modulation, quadrature amplitude modulation, and orthogonal coding frequency division multiplexing.

In this case, the channel interface unit 30 includes a frequency counter 32 for counting an input clock (eg, 27 MHz) frequency and an MPEG-2 transport stream packet 72 extracted from the packet filter controller 40. A frame controller 34 that generates a CLK, a control signal (Valid, a frame), and an MPEG-2 transport stream of data D0 to D7, and has a first-in first-out (FIFO) memory therein, and a packet filter controller ( A data memory 38 for temporarily storing data generated from the data 40, and data is transferred from the data memory 38 to a first-in first-out (FIFO) memory of the frame controller 34 to generate an MPEG-2 transport stream. It is composed of a direct access memory controller 36 that controls the flow of data to enable.

In this way, content can be transmitted at a constant bit rate (CBR) and a variable bit rate (VBR) in a real time protocol service 87 (RTP: Real Time Protocol) message transmitted to the Ethernet interface unit 60. The packet 72 for the MPEG-2 transport stream is extracted from the UDP packet data 86.

In other words, TCP / IP provides two protocols, Transport Control Protocol (TCP) and User Datagram Protocol (UDP), which operate at the transport layer. While TCP provides a highly monitored and reliable transport service, UDP Is configured to extract UDP packet data 86 by using a simple service that does not include error correction or flow control services.

In addition, the present invention serves as a digital tuner for demodulating and forward error correcting modulated frequency signals such as satellites, cables, and terrestrial waves used in digital broadcasting, and extracting packet data transmitted to the Internet to provide an output such as a digital tuner. Done.

Note that UDP is suitable for applications that use broadcast or multicast intensive applications, applications that require quick response to discovery and queries, applications that do not need to frequently send update messages, or applications where all messages do not need to be delivered. As a protocol, the MPEG-2 Transport Stream (TS) is a bit string defined by the MPEG system and is composed of a set of 188-byte fixed length packets (transport packets).

Each transport packet consists of a header, an adaptation field for inserting additional information into a particular individual packet, and a payload indicating the content of the packet (video / audio, etc.).

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

2 to 4, when the MPEG-2 transport stream video data is transferred from the server to the Ethernet interface 60 through the network in the form of the packet encapsulated in FIG. 4, the media access controller 50 In FIG. 2, the capsule data 70 is passed to the packet filter controller 40 using the Internet protocol (IP) and the transport protocol (UDP).

On the other hand, if the application of the server sends data through the network, it transmits the data to the transmission protocol through the assigned port number and informs the transmission protocol of which port of the destination system to transmit the data to, which means Encapsulates the address for sending data and the address system of the receiving medium using the MAC (84) and the Internet address (IPv4) 85 containing the address information of the PHY 83 which informs the address and the media access controller 50. This is confirmed in the data 70.

In this process, UDP (transport protocol) packet data 86 contains information such as port number and data amount to be connected as a means of providing an unreliable connection between two sockets, RTP 87 containing real-time control protocol information, It is composed of a CRC 81 for error prevention of transmission and reception data.

At this time, the packet filter controller 40 extracts the pure MPEG-2 transport stream packet 72 by referring to the UDP packet data 86.

The extracted MPEG-2 transport stream packet 72 is temporarily stored in the data memory 38, and is synchronized with the frequency of the frequency counter 32 to which a clock of 27 MHz is applied.

In this process, the frame controller 34 having the first-in, first-out FIFO memory outputs an MPEG-2 transport stream signal. The frame controller 34 directly receives data from the data memory 38 to directly receive the data without the help of the packet filter controller 40. Access memory controller 12 is used.

The frame controller 34 also outputs 8-bit data D0 to D7 including the timing CLK signal and the control signal Valid.

As described above, when the video control apparatus is configured in a network, the MPEG-2 image quality can be watched without using a separate tuner and antenna, thereby simplifying the configuration and reducing equipment costs. Furthermore, when connected with a video server, it can be expected to realize two-way video on demand (VOD), and when used in conjunction with a network product including a media access controller, MPEG-2 in the future It is also possible to release applications that can receive digital broadcasting.

Furthermore, the present invention has the effect of enabling bidirectional data communication and multicasting or broadcasting in a TCP / IP-based broadband service environment, and in particular, a real-time network of a video server or a broadcaster without a separate tuner in the Internet. It is also possible to easily control video on demand through the IP conversion MPEG-2 transport stream system.

Claims (2)

An Ethernet interface unit 60 connected to the network; A media access controller (50) for carrying out the TCP / IP protocol; A packet filter controller (40) for recognizing UDP packet data (86) on the capsule data (70) transmitted from the medium access controller (50) and extracting the MPEG-2 transport stream packet (72); And a channel interface unit 30 which demodulates and outputs the MPEG-2 transport stream extracted from the packet filter controller 40 by orthogonal phase shift modulation, orthogonal amplitude modulation, and orthogonal encoding frequency division multiplexing. Digital video control device through network. 2. The apparatus of claim 1, wherein the channel interface unit (30) comprises: a frequency counter (32) for counting an input frequency; The MPEG-2 transport stream packet 72 extracted from the packet filter controller 40 is generated as an MPEG-2 transport stream of a timing signal CLK, a control signal Valid, a frame, and data D0-D7. A frame controller 34 having a first-in first-out (FIFO) memory therein; A data memory 38 for temporarily storing data generated from the packet filter controller 40; It consists of a direct access memory controller 36 that controls the flow of data to transfer data from the data memory 38 to a first-in first-out (FIFO) memory of the frame controller 34 to generate an MPEG-2 transport stream. Digital video control device through a network, characterized in that.