Patent ID: 7729275

Claim:
A method for voice quality estimation in a VoIP system, comprising: detecting an impairment in a received VoIP signal having a series of packets, where an original signal corresponding the received VoIP signal is not available, wherein detecting the impairment further comprises, calculating the average energy of each packet of the received VoIP signal; determining an energy threshold value of silence for the received VoIP signal; for every packing having an energy value less than the energy threshold value, replacing the energy value with the energy threshold value to produce a modified VoIP signal corresponding to the received VoIP signal; calculating the inverse of the energy of the modified VoIP signal; and identifying lost packets in the received VoIP signal by identifying peaks in the inverse of the energy of the modified VoIP signal; evaluating an amount of degradation in the received VoIP signal caused by the impairment; and estimating the voice quality of the received VoIP signal according to the amount of degradation.