Method and apparatus for increased quality of voice transmission

Details Method and apparatus for increased quality of voice transmission Method and apparatus for increased quality of voice transmission

1996-04-30

1999-03-16

Nguyen, Chau

Multiplex communications

Pathfinding or routing

Combined circuit switching and packet switching

370394, 370473, 371 3702, 379 9001, H04L 1228, H03M 1300, H04M 1100

Patent

active

058838910

ABSTRACT:
To satisfactorily transmit two-way speech on digital computer networks, such as the Internet, it is necessary to reduce unpredictable delays due to variations in loading, routing and other factors. The present invention transmits extra packets of specially computed data along with the data representing speech. These extra packets are used at the receiving server to reconstruct any missing or late data packets. In one embodiment, any single packet of missing data in a stream of packets may be reconstructed. In additional embodiments, multiple packets of missing data may be reconstructed. This method is particularly suited to eliminating or reducing delays in networks in which data is sent down multiple diverse paths. Unlike prior art, it is not necessary to send full sets of redundant data down these diverse paths. The present invention significantly reduces latency with only a fraction of the added network bandwidth required with prior art methods that use full sets of redundant data.

REFERENCES:
patent: 4771425 (1988-09-01), Baran et al.
patent: 5526353 (1996-07-01), Henley et al.
patent: 5553063 (1996-09-01), Dickson
patent: 5673265 (1997-09-01), Gupta et al.
patent: 5710756 (1998-01-01), Pasternak et al.

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