MAPPING OBJECTIVE VOICE QUALITY METRICS TO A MOS DOMAIN FOR FIELD MEASUREMENTS

A processing unit and method are described herein that are capable of estimating a quality of a speech signal transmitted through a wireless network. The processing unit uses a logistic function to map a score output from an objective voice quality method (PESQ algorithm) into a mean of opinion (MOS) score which is an estimation of the quality of the speech signal that was transmitted through the wireless network. The logistic function has the form: y=1+4/(1+exp(−1.7244*x+5.0187)) where x is the score from the PESQ algoritm which is in the range of −0.5 to 4.5 and y is the mapped MOS score which is in the range of 1 to 5 wherein if y=5 then the quality of the speech signal is considered excellent and if y=1 then the quality of the speech signal is considered bad.