Low latency digital audio over packet switched networks

Details Low latency digital audio over packet switched networks Low latency digital audio over packet switched networks

2011-06-28

2011-06-28

Lai, Andrew (Department: 2473)

Multiplex communications

Communication techniques for information carried in plural...

Combining or distributing information via time channels

C370S235000

Reexamination Certificate

active

07970019

ABSTRACT:
Method and Apparatus for delivering audio signals from a source node to a destination node on a network. The apparatus uses a number of switches that transmit prioritized data on a packet network. The switches are coupled to a number of send/receive nodes for sending and receiving digital audio signals on the data network. The audio packet size and the receive buffers are sized to store a minimum possible number of audio samples to minimize latency in processing audio signals arriving at said receive node, but still ensure audio delivery without interruption due to packet data network delay. An additional feature of the invention is recovery of clock synchronization over the same data network by novel arrangement of transmission of timing packets on the network. By sending a multiplicity of packets at irregular intervals a minimum network transit delay can be determined by each of the receive nodes which allows the receive nodes to filter out packet network transit delay error and maintain accurate local clocks.

REFERENCES:
patent: 4616359 (1986-10-01), Fontenot
patent: 4707829 (1987-11-01), Pendse
patent: 4845609 (1989-07-01), Lighthart
patent: 4872160 (1989-10-01), Hemmady et al.
patent: 5510797 (1996-04-01), Abraham et al.
patent: 5510979 (1996-04-01), Moderi et al.
patent: 5517590 (1996-05-01), Auborn et al.
patent: 5517690 (1996-05-01), Linquist et al.
patent: 5517979 (1996-05-01), Closson
patent: 5714997 (1998-02-01), Anderson
patent: 5761430 (1998-06-01), Gross et al.
patent: 5761431 (1998-06-01), Gross et al.
patent: 5956674 (1999-09-01), Smyth et al.
patent: 6091709 (2000-07-01), Harrison et al.
patent: 6161138 (2000-12-01), Gross et al.
patent: 6246702 (2001-06-01), Fellman et al.
patent: 6438702 (2002-08-01), Hodge
patent: 6611519 (2003-08-01), Howe
patent: 6665316 (2003-12-01), Eidson
patent: 7142536 (2006-11-01), Gossett et al.
patent: 7577095 (2009-08-01), Shay et al.
patent: 2001/0038647 (2001-11-01), Bernath et al.
patent: 2001/0040872 (2001-11-01), Haglund
patent: 2002/0186716 (2002-12-01), Eidson
patent: 2003/0177154 (2003-09-01), Vrancic
patent: 2003/0189953 (2003-10-01), Matsumura et al.
patent: 1006686 (2000-06-01), None
Holmeide, Øyvind and Skeie, Tor, VoIP Drives Realtime Ethernet, journal, pp. 26-29.
Skeie, Tor, Johannessen, Svein and Holmeide, Oyvind, The Road to an End-to-End Deterministic Ethernet, Symposium, Aug. 28-30, 2002, pp. 3-9, 4thissue, Norway.
Karam, Mansour J. and Tobagi, Fouad A., Analysis of the Delay and Jitter of Voice Traffic Over the Internet, Journal, 2001, pp. 824-833.
D.L. Mills, Measured Performance of the Network Time Protocol in the Internet System, journal, Oct. 1989, pp. 1-18, University of Delaware.

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