The patent's inventor is
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From the background information supplied by the inventors, news correspondents obtained the following quote: "A. Field of the Invention
"The present invention relates generally to electronic communications and, more particularly, to packet loss concealment in packet switching communications networks.
"B. Description of the Related Art
"Today, real-time telecommunication signals (e.g., voice, video, audio, data, and multimedia) are increasingly transported via packet switching networks. For example, Internet applications now routinely packetize voice, video, and audio signals and periodically transmit, or stream, the resulting data packets from source to destination. However, when such packetized streams traverse a packet switching network such as the Internet, some of the transmitted packets may be corrupted or lost. For example, packets are sometimes corrupted through bit errors in transmission and packets are sometimes dropped or discarded due to traffic congestion at buffer pools in network switches or routers. Such corrupted and dropped packets constitute loss of information and thus degrade the quality of transmitted signals as perceived by end users.
"To improve quality of reception and perception, various error correction and packet loss concealment schemes have been devised. Whereas error correction techniques attempt to fix bit errors or bit erasures in a received signal, packet loss concealment techniques attempt to mask or camouflage missing packets in a received signal by generating and substituting replacement packets when the signal is presented to the end user at the signal destination. Basic packet loss concealment methods simply attempt to replace missing information with information from previous packets, while more sophisticated loss concealment methods synthesize replacement information based on previously received information and/or knowledge of the signal source.
"Generally, known loss concealment methods provide acceptable levels of perceptual quality (e.g., toll quality for signals transmitted by commercial providers for paying customers) when packet losses are relatively few and far between. However, when packet loss rates increase (e.g., due to network congestion and/or channel degradation), or when bursts of consecutive packet loss occur, known loss concealment methods can fail to provide acceptable signal quality.
"Consequently, a need exists for improved forms of packet loss concealment."
Supplementing the background information on this patent, VerticalNews reporters also obtained the inventor's summary information for this patent: "Systems and methods consistent with the present invention address this and other needs by applying packet loss concealment techniques, not only at a signal destination, but also at one or more intermediate points in a network path between a signal source and a signal destination.
"In accordance with the purpose of the invention as embodied and broadly described herein, an exemplary communications system includes at least one loss concealment processor configured to perform packet loss concealment on a stream of information packets as the stream passes through an intermediate location within a packet switching network.
"In another implementation consistent with the present invention, a method of communicating information from a source to a destination includes: transmitting a stream of information packets from the source to an intermediate location; performing packet loss concealment on the stream of information packets, at the intermediate location, to form an intermediate stream of information packets; transmitting the intermediate stream of information packets from the intermediate location to the destination; and performing packet loss concealment on the intermediate stream of information packets at the destination.
"In yet another implementation consistent with the present invention, a packet switching node for use in a packet switching network includes: an input interface configured to receive streams of information packets from a plurality of communications sources; an output interface configured to selectively transmit the streams of packets to a plurality of communications destinations; and a loss concealment processor configured to perform packet loss concealment on the streams of packets as they pass through the packet switching node."
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Keywords for this news article include: Electronics, Packet Switching,
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