The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 24, 2008
Filed:
Sep. 29, 2004
Minkyu Lee, Ringoes, NJ (US);
James William Mcgowan, Whitehouse Station, NJ (US);
Minkyu Lee, Ringoes, NJ (US);
James William McGowan, Whitehouse Station, NJ (US);
Lucent Technologies Inc., Murray Hill, NJ (US);
Abstract
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.