12. A system for non-intrusive mean opinion score estimation based on packet loss pattern, the system comprising: a first module for receiving a stream of packet data and determining a probability of packet loss for the received stream; and a second module for determining an estimated mean opinion score for the received stream based on the determined probability of packet loss for that stream using a function that maps probabilities of packet loss to measured mean opinion scores, wherein the function was derived by generating a plurality of probabilities of packet loss, and, for each generated probability of packet loss: generating, from a reference data stream, a degraded data stream suffering packet loss according to the generated probability, measuring a mean opinion score for the degraded data stream using an intrusive algorithm that operates on the contents of the data packets of the degraded data stream, and determining an association between the generated probability of packet loss and the calculated mean opinion score.
12. A system for non-intrusive mean opinion score estimation based on packet loss pattern, the system comprising: a first module for receiving a stream of packet data and determining a probability of packet loss for the received stream; and a second module for determining an estimated mean opinion score for the received stream based on the determined probability of packet loss for that stream using a function that maps probabilities of packet loss to measured mean opinion scores, wherein the function was derived by generating a plurality of probabilities of packet loss, and, for each generated probability of packet loss: generating, from a reference data stream, a degraded data stream suffering packet loss according to the generated probability, measuring a mean opinion score for the degraded data stream using an intrusive algorithm that operates on the contents of the data packets of the degraded data stream, and determining an association between the generated probability of packet loss and the calculated mean opinion score. 13. The system of claim 12 wherein at least one of the first and second modules is a component of a network analyzer or network emulator.