This paper proposes a novel method for objective assessment of speech quality based on one-step strategy.Using the theory of multi-dimension non-linear mapping of the feedfoward neutral network

the method combines the traditional two steps of average distortion computing and mapping from the average distortion value to the Mean Opinion Score (MOS) into one step.It can embody adequately the perception properties of the human auditory system with simple computing and also is a unanimous estimate for MOS in statistical sense.Experimental results show that the correlation coefficient between the subjective test score and objective MOS estimate of one-step method can reach up to about 0.95

which is obviously better than that of the conventional two-step methods.