Patent ID: 6862298
Filing Date: 2005-03-01
Classification: H04J,H04L

Abstract:
1. A system for receiving digital voice signals transmitted over a data network, comprising: a jitter buffer, having a variable storage size, arranged to receive packets of data comprising the digital voice signals, to store said packets, and to serially output said packets; a jitter buffer manager which (a) monitors the arrival of said packets, (b) determines at least one variation parameter which measures the variation in transit delay among said arriving packets, and (c) controls the jitter buffer size in response to the variation parameter; and a speed control module, which responds to a control signal from said jitter buffer manager by modifying a rate of consumption of packets serially output from said jitter buffer, to compensate for changes in said jitter buffer's storage size comprising comparing an average packet delay with a reference delay corresponding to a temporally centered position in said buffer; and adjusting said variable rate of transfer of packets from said buffer when said average packet delay deviates from said centered position by more than a threshold amount, thereby moving said centered position to align with said average packet delay.