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AssigneeLucent Technologies Inc.
InventorsMinkyu Lee, James McGowan
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A method and apparatus for measuring Quality-of-Service (QoS) in packet-based communications networks for Voice-over-IP applications is advantageously based not only on packet loss information but also on particular characteristics of the speech data itself. Measurement of failures of the “quasi-stationary” (QS) property of speech—that is, the assumption that both the pitch and spectral envelop usually vary slowly relative to the packet size—are advantageously used in conjunction with measures of packet loss characteristics (e.g., packet loss rates or burst ratios) to calculate a QoS measure. One specific QS failure measure—referred to herein as QSFE (quasi-stationary failure estimate)—advantageously estimates the phoneme rate and is used in one illustrative method for calculating a QoS measure for Voice-over-IP applications in the presence of packet loss.
A method for calculating a Quality-of-Service measure in a packet-based communications network under packet loss conditions, the Quality-of-Service measure based on a sequence of packets transmitted over a period of time, the packets in said sequence comprising speech information, the method comprising the steps of:
An apparatus for calculating a Quality-of-Service measure in a packet-based communications network under packet loss conditions, the Quality-of-Service measure based on a sequence of packets transmitted over a period of time, the packets in said sequence comprising speech information, the apparatus comprising a processor adapted to:
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