Multiplex communications – Pathfinding or routing – Combined circuit switching and packet switching
Reexamination Certificate
2005-06-24
2009-08-11
Chan, Wing F (Department: 2419)
Multiplex communications
Pathfinding or routing
Combined circuit switching and packet switching
C370S400000, C370S401000, C370S265000, C370S266000, C370S267000
Reexamination Certificate
active
07573868
ABSTRACT:
Audio and video frames are synchronized by hashing an audio frame at a sender and combining the resultant hash value with the video frame. The audio frame is transmitted over an audio network, such as a telephone network, and the video frame is transmitted over a digital network, such as an intranet. The audio frame may be combined with additional audio signals from an audio bridge. The receiver receives the audio signal from the audio bridge and performs the same hash function on the mixed signal as was performed on the original signal. The receiver correlates the hash value on the mixed signal with the hash value included with the video frame (wherein the video frame is one of several video frames buffered by the receiver). The receiver can thus identify the video frame that corresponds to the audio frame and render them simultaneously.
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Bridgewater Alan L.
Cutler Ross G.
Chan Wing F
Mais Mark A
Microsoft Corporation
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