Abstract:
The present invention provides a method (900) and device (100) in multimedia communication systems for efficiently segmenting information bitstreams from multiple media sources into variable length packets, and multiplexing and sending the packets to a shared communication link with low delay and low overhead. The packet segmentation and multiplexing are performed dynamically based on fullness of a set of information buffers that contain the information bitstreams to be transmitted, and delay-sensitivity of each information bitstream. The multi-discipline queuing scheme has been developed in this invention to control the dynamic packet segmenting and multiplexing process.
Abstract:
The present invention provides a method (900) and device (100) in multimedia communication systems for efficiently segmenting information bitstreams from multiple media sources into variable length packets, and multiplexing and sending the packets to a shared communication link with low delay and low overhead. The packet segmentation and multiplexing are performed dynamically based on fullness of a set of information buffers that contain the information bitstreams to be transmitted, and delay-sensitivity of each information bitstream. The multi-discipline queuing scheme has been developed in this invention to control the dynamic packet segmenting and multiplexing process.
Abstract:
The method (1100) and device (200, 900, 1400) of the present invention provides a mechanism to apply smoothing delay to video packets transmitted through a packet-switched network. Since the method and device using this invention perform a smoothing delay at video frame level, instead of packet level, smoothing delay can be minimized and at the same time the video decoder overflow can still be prevented. The present invention reduces system complexity by eliminating the need to recover the time stamp for each packet. Furthermore, the present invention does not require the prior knowledge of the worst network delay Δ. Thus, the present invention provides for a minimized jitter smoothing delay with concurrent minimized implementation complexity.
Abstract:
The method (1100) and device (200, 900, 1400) of the present invention provides a mechanism to apply smoothing delay to video packets transmitted through a packet-switched network. Since the method and device using this invention perform a smoothing delay at video frame level, instead of packet level, smoothing delay can be minimized and at the same time the video decoder overflow can still be prevented. The present invention reduces system complexity by eliminating the need to recover the time stamp for each packet. Furthermore, the present invention does not require the prior knowledge of the worst network delay DELTA . Thus, the present invention provides for a minimized jitter smoothing delay with concurrent minimized implementation complexity.
Abstract:
The present invention provides a device (100), method, and system for, in an entry node (102) of a packet communication network, transcoding (104) a received constant bit-rate video bitstream to a variable bit-rate video bitstream, packetizing (106) the variable bit-rate video bitstream into video packets for efficient transport of a video signal over a packet-switched network.
Abstract:
A priority assignment method (100) and device (300) are set forth for assigning a priority to a selected speech frame coded by a linear predictor coder based on at least two of: an energy of the speech frame, a log spectral distance between selected consecutive frames, and a pitch predictor coefficient for the selected speech frame. The invention protects against loss of perceptually important and hard-to-reconstruct speech frames.
Abstract:
The present invention provides a device (100), method, and system for, in an entry node (102) of a packet communication network, transcoding (104) a received constant bit-rate video bitstream to a variable bit-rate video bitstream, packetizing (106) the variable bit-rate video bitstream into video packets for efficient transport of a video signal over a packet-switched network.