摘要:
An asynchronous transport stream receiver of a digital broadcasting receiving system connected to MPEG-2 (Moving Picture Experts Group-2) equipment, such as a VOD (Video On Demand) server is disclosed. The inventive receiver includes an FIFO section for storing MPEG-2 data generated from DVB-ASI (Digital Video Broadcasting Asynchronous Serial Interface) signals, an oscillator for generating clock signals for producing the MPEG-2 data from the DVB-ASI signals, and a read controller for reading and outputting the MPEG-2 data stored at the FIFO section in synchronization with clock signals of the oscillator. Accordingly, the MPEG-2 data can be processed and outputted regardless of the SD or HD leveled compression condition (bit rate) of the MPEG-2 data transmitted according to the DVB-ASI standard.
摘要:
A system for performing transmission and reception operations based on broadcast/communication convergence. A transmitter adapted for the broadcast/communication convergence converts input broadcast data into a parallel format, inserts port identification (Port ID) information into each of the broadcast data converted into the parallel format and input communication data, multiplexes the broadcast data and the communication data, and transmits a broadcast/communication convergence signal based on a result of the multiplexing through a single transmission channel. A receiver adapted for the broadcast/communication convergence demultiplexes the broadcast/communication convergence signal using the Port ID information to be separated into the broadcast data and the communication data when the broadcast/communication convergence signal is received, and outputs data to a corresponding destination.
摘要:
An optical transmission network is disclosed that classifies digital broadcast channel data according to virtual channel connection (VCC) before transmission. In the optical transmission network, an optical signal receiver converts an optical signal from an optical line terminal (OLT) into an ATM cell that is classified according to the VCC. A VCC-based ATM cell classifier detects header information and a payload part from the classified ATM cell of each VCC. PID analyzers receive a payload part of an ATM cell corresponding to one VCC from the VCC-based ATM cell classifier, extract PID of each broadcast channel from digital broadcast channel data included in the payload part, and output specific broadcast channel data in the broadcast channel data included in the payload part. A switch receives broadcast channel data output from the PID analyzers and switches the received broadcast channel data to a broadcast channel desired by each subscriber. The controller updates broadcast channel information by receiving header information of the classified ATM cell of each VCC from the VCC-based ATM cell classifier, receives the broadcast channel desired by the subscriber, and controls the PID analyzers to output the desired broadcast channel according to VCC information with the desired broadcast channel included therein so that the output broadcast channel is matched to the subscriber.
摘要:
An apparatus and a method for adjusting a transmission rate of data, in particular a moving picture experts group 2 (MPEG-2) data is disclosed The apparatus includes a receiving buffer for buffering multi program transport stream (MPTS) packets received at various transmission rates, and a packet storage for storing MPEG-2 null packets. A signal processing section reads data buffered in the receiving buffer at a predetermined output transmission rate, wherein the signal processing section stops an operation of reading data buffered in the receiving buffer, and reads and transmits the MPEG-2 null packets stored in the packet storage when a predetermined underflow occurrence forecast situation is caused in the receiving buffer.
摘要:
An apparatus and a method for adjusting a transmission rate of data, in particular a moving picture experts group 2 (MPEG-2) data. The apparatus includes a receiving buffer for buffering multi program transport stream (MPTS) packets received at various transmission rates, and a packet storage for storing MPEG-2 null packets. A signal processing section reads data buffered in the receiving buffer at a predetermined output transmission rate, wherein the signal processing section stops an operation of reading data buffered in the receiving buffer, and reads and transmits the MPEG-2 null packets stored in the packet storage when a predetermined underflow occurrence forecast situation is caused in the receiving buffer. In addition, the method for adjusting a transmission rate of MPEG-2 data includes: reading and transmitting buffered data when a current buffered data point (CF) reaches a predetermined data output point (HF) in a receiving buffer which receives the input MPST packets, stopping the reading of data buffered in the receiving buffer and transmitting MPEG-2 null packets when the current buffered data point ( CF) reaches a predetermined underflow forecast point (QF) in the process of reading the buffered data; and reading and transmitting buffered data when the current buffered data point (CF) reaches the data output point (HF) in the process of transmitting the null packets.
摘要:
Disclosed is a method of performing a periodical synchronization at a predetermined transmission link for ensuring a start of a super frame in a residential Ethernet system. The method includes the steps of ensuring a start of a first predetermined super frame at the predetermined transmission link, transmitting Sync frames and Async frames through a predetermined number (N-1) of super frames, in which N is a total number of the super frames, and controlling an Async frame to be transmitted at an end point of the (N-1) super frames in such a manner that a start of a next super frame (Nth super frame) is strictly ensured, thereby maintaining a synchronization for the start of the super frame.
摘要:
A method for generating a super frame of a predetermined size in a a residential Ethernet system for separately transmitting isochronous data and asynchronous data includes the steps of: receiving by the residential Ethernet system the isochronous data and the asynchronous data to be transmitted through the residential Ethernet system; dividing the received isochronous data into a plurality of sub-frames according to synchronous links; inserting an Ethernet header into each of the sub-frames, thereby generating a plurality of isochronous packets; and employing a remaining area, which is obtained by excepting an area of the isochronous packets from the predetermined size, as an asynchronous packet area, and inserting asynchronous packets including the asynchronous data into the asynchronous packet area.
摘要:
A packet type retransmission system for DMB services includes a DMB device for receiving multimedia data from a content provider, for converting the multimedia data to DMB data for DMB transmission, and for transmitting the DMB data. A broadcasting transfer medium transfers the DMB data transmitted through the DMB device. A DMB-IP converter receives the DMB data transferred through the broadcasting transfer media and converts the DMB data to packet based data. An IP based multimedia transmitting device outputs the packet based multimedia data converted through the DMB-IP converter to user devices.
摘要:
Disclosed is a transport stream transmission apparatus, for example an MPEG Motion Picture Experts Group)—transport stream transmission apparatus. The transmission apparatus comprising a transmitter including a first media independent interface to generate a data stream, the data stream having a preamble and at least one transport stream, and a first physical layer device to receive a data frame from the first media independent interface, a back plane board to receive the data frame from the transmitter, and enable distribution of the received data frame to individual subscribers, and a second media independent interface to receive at least one transport stream from the second physical layer device, and enable individual subscribers to received transport stream, wherein the second media independent interface includes a second physical layer device to identify a preamble of the data frame received from the back plane board, perform a clock recovery operation, and generate at least one transport stream of the data frame.
摘要:
Disclosed is a method, apparatus and computer product for ensuring QoS (Quality of Service) of isochronous data in a Residential Ethernet system including a legacy Ethernet device and a first Residential Ethernet switch, in which the first Residential Ethernet switch transmits data packets to the legacy Ethernet device, the method comprising the steps of inserting, by the first Residential Ethernet switch, virtual local area network (VLAN) tags into the data packets in order to allocate priorities to the data packets, and establishing priorities of the VLAN tags such that a highest priority is allocated to isochronous packets from among the data packets.