Multiplex communications – Pathfinding or routing – Combined circuit switching and packet switching
Patent
1996-01-26
1998-08-04
Chin, Wellington
Multiplex communications
Pathfinding or routing
Combined circuit switching and packet switching
370389, 370392, 370516, 375371, 379 9301, H04L 1228, H04L 1256, H04J 306
Patent
active
057905380
ABSTRACT:
A System for Voice Playout in an Unsynchronized Packet Network for use with isochronous and asynchronous data transmission over a communication network having at least one receiving unit and at least one transmitting unit each having independent clocks. A FIFO voice codeword storing device in the receiving unit removes timing jitter from incoming packets--and receives voice packets from a data network. A phase continuous packet clock thereafter removes packets from the FIFO voice codeword storing device which is synchronized to the incoming data rate using the fill status of the FIFO voice codeword storing device as a frequency control signal. A continuous phase resampler removes timing frequency offset without causing packet slips or loss of data. The transmitter inserts the contents of a free running packet counter into each transmitted packet, allowing the receiver to detect lost packets and to properly reproduce silence intervals during Playout. A receive sequence counter increments at the local packet rate to schedule Playouts for multiple voice segments. A clock frequency recovery is utilized where the receiver clock frequency differs from the transmitter clock frequency. When the receive clock is not available, such as voice over packet networks applications, the FIFO voice codeword storing device fill status can control the resampling rate.
REFERENCES:
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patent: 4961188 (1990-10-01), Lau
patent: 5255291 (1993-10-01), Holden et al.
patent: 5361261 (1994-11-01), Edem et al.
patent: 5450450 (1995-09-01), Lee
Carman Melissa Kay
Chin Wellington
Telogy Networks Inc.
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