摘要:
Methods of testing receiver video fidelity are disclosed. One example method includes producing a video test signal; coupling the video test signal into an input of the receiver, wherein the video test signal is configured to cause a decoder to output a step function signal upon processing the video test signal; coupling the step function signal to a display rate converter; and measuring signal characteristics of signals provided at a receiver output.
摘要:
A communication system includes a content repository 274 storing a content file and a video transport processing system 273 in communication with the content repository 274. The video transport processing system 273 receives a plurality of conditional access information, stores a relative time of arrival of each of the plurality of conditional access information and encrypts the content file using the plurality of conditional access information and the relative time of arrival to form an encrypted content file.
摘要:
A communication system includes a content repository storing a content file and a video transport processing system receiving the content file and dividing the content file into a plurality of content file portions, forming a leading data portion, determining a cyclic redundancy check value, forming a trailing data portion with the cyclic redundancy check value therein, forming a content data stream from the leading data portion, the plurality of content file portions and trailing data portion. The system also includes a system communicating the content data stream to a user device.
摘要:
A communication system includes a content repository 274 storing a content file and a video transport processing system 273 in communication with the content repository 274. The video transport processing system 273 receives a plurality of conditional access information, stores a relative time of arrival of each of the plurality of conditional access information and encrypts the content file using the plurality of conditional access information and the relative time of arrival to form an encrypted content file.
摘要:
A communication system 100 includes a content repository 274 storing a content file and a video transport processing system 223 receiving the content file and dividing the content file into a plurality of content file portions, forming a leading data portion, determining a cyclic redundancy check value, forming a trailing data portion with the cyclic redundancy check value therein, forming a content data stream from the leading data portion, the plurality of content file portions and trailing data portion. The system also includes a system communicating the content data stream to a user device.
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.