摘要:
Essential data elements, particularly entitlement control messages (ECMs), are inserted in a manner that reduces the overhead bit rate without effecting overall tuning time at the customer receiver or security in satellite, cable or other programming networks. ECMs are inserted into the transport stream by detecting random access points (RAPS) in the encoded programming and inserting the ECM packets in a window just ahead of the RAP.
摘要:
Content delivery systems and methods to operate the same are disclosed. A disclosed example content delivery system comprises: a receiver station; a content server to transfer a file to a receiver via a point-to-point communication signal; and a transmission source that includes a computer readable medium to store the file containing pre-packetized content data and a controller to send the file containing the pre-packetized content data to a broadcast transmitter and to the content server.
摘要:
A system and method for distributing high definition television (HDTV) and standard definition television (SDTV) signals via satellite is disclosed. At the transmission station an MPEG-2 video encoder compresses a video signal and a digital encoder encodes an audio signal. The compressed video and the encoded audio are coupled to PES packetizers, which generate video and audio packetized elementary data streams having PES headers and PES payloads. Within each PES header is a presentation time stamp (PTS), which is representative of the time at which the payload is to be displayed to the user. The packetized elementary data streams are multiplexed together by a transport multiplexer and repacketizer and broadcast to receiver stations, via satellite. The receiver stations receive the PES information and obtain the PTS. A receiver station multiplies the PTS by 300 and compares its local clock reference to that time. When the local clock reference and the PTS are identical, the PES audio and video information is displayed to the user according to the local clock reference.
摘要:
A method and apparatus for synchronizing audio and video portions of a media program signal is disclosed. In a transmitting embodiment, the method comprises the steps of identifying a video event according to an video event discriminant in the video signal, and inserting a timing signal into the audio signal, and the apparatus comprises a video analysis module for identifying a video event according to an video event discriminant in the video signal, a timing signal generator for generating a timing signal, and a mixer for inserting the timing signal into the audio signal.
摘要:
A method, apparatus, article of manufacture, and a memory structure for translating an input data packet from an input format to at least one output data packet in an output format. The method comprises the steps of reading a series of data packets in the input format, the data packets including a data type identifier, wherein at least some of the data packets include first time synchronization data and at least some of the data packets include payload data; identifying data packets of interest in the series of data packets according to data type using the data type identifier; identifying data packets from the data packets of interest having time synchronization information; generating second time synchronization information from the first time synchronization information for the data packets having time synchronization information, and generating at least one output data packet in the output data format having the second time synchronization information. In one embodiment, the method further comprises the steps of identifying data packets from the data packets of interest having payload data, and assembling at least one output data packet in the second format having the payload data.
摘要:
Methods and apparatus for broadcasting high quality audio “studio direct” with the same digital information employed in the studio by the video producer with AC-3 digital audio signals for broadcast to integrated receiver decoders (IRD). Control over individual data bits such as copyright bits is maintained by determining the bit status, comparing it to a preferred status, changing the status if it does not comply with the preferred status, and reevaluating cyclical redundancy check value in each data packet to avoid disruption in the data transmission. The system includes an uplink device which automatically checks, logs and reports errors in Dolby Digital AC-3 signals by a monitor which employs a processor, a digital audio card and an SMPTE timecode reader. The monitor employs a state machine that finds AC-3 packets, locks into the packets and detects discontinuities or loss of signal. A sound card having an input for receiving house reference AES clock pulses enables the AES clock of the playback signal to be locked to the frequency of a production house master as a time code reader or an editor's contact closure match video and audio signals playback.
摘要:
A system and method for merging of multiple encoded audio and video streams into a single program in the transport stream enables playback of any audio stream with any video stream. This is accomplished by first locking the frequency of audio and video input streams for a plurality of different programs to a source clock, independently encoding each program with its own PCR and PTS into a program stream, multiplexing the program streams into a transport stream, and then synchronizing the PCR and PTS of the program streams to a declared master PCR.
摘要:
A system and method for adding auxiliary data DA to an output data stream from a statistical multiplexer is disclosed. An auxiliary multiplexer accepts a statistically multiplexed data stream, and substitutes auxiliary data packets for null data packets. The auxiliary multiplexer controls the number of null packets in the statistically multiplexed data stream by controlling the target bandwidth BT of the statistical multiplexer, or by modifying the statistical multiplexer equation to make the auxiliary data stream a participant in the negotiation process of allocating throughput among the data sources.
摘要翻译:公开了一种用于将辅助数据D A A加到来自统计多路复用器的输出数据流的系统和方法。 辅助复用器接受统计复用的数据流,并将辅助数据分组替换为空数据分组。 辅助复用器通过控制统计多路复用器的目标带宽B SUB来控制统计复用数据流中的空分组数,或通过修改统计多路复用器方程来使辅助数据流成为参与者 在数据源之间分配吞吐量的协商过程。
摘要:
A programmable video transformation rendering method and apparatus regenerates an arbitrary reverse address map according to a transformation function representing a desired video effect by using a set of parameters that are run length encoded. Each scan line in target space for an output image is divided into one or more continuous line segments in source space for the input image using a continuous function for each line segment. The parameters for each line segment are determined, encoded, and stored for execution of the transformation function. For each line segment the parameters are updated, with only those parameters needing updated being stored together with the prior parameters that do not need to be updated. The continuous function is in the form of a polynomial equation and is a compromise between the amount of data generated and the calculations required.
摘要:
A frame format for a video codec combines video data at a video subcarrier frequency with up to five data channels at a DS1 digital telecommunications data rate and an optional audio/telephone channel. Video data is sampled and input to a stuff FIFO at the subcarrier frequency rate and output to a multiplexer at a DS3 digital telecommunications data rate. A stuff word is generated for each DS3 data subframe and contains either a valid data bit or a garbage data bit, as indicated by a stuff flag contained in the stuff word, to compensate for the difference in input and output data rates from the stuff FIFO. The DS3 master frame generated by a multiplexer from the video data and the other data channels is transmitted and decoded at the receiving end in a reverse manner.