1. ITU-T.: Methods for subjective determination of transmission quality. International Telecommunications Union, Geneva, Switzerland, ITU-T Recommendation P.800 (1996)
2. ITU-T.: Perceptual evaluation of speech quality (PESQ), an objective method for end-to-end speech quality assessment of narrowband telephone networks and speech codecs. International Telecommunications Union, Geneva, Switzerland, ITU-T Recommendation P.862 (2001)
3. ITU-T.: Single-ended method for objective speech quality assessment in narrow-band telephony applications. International Telecommunications Union, Geneva, Switzerland, ITU-T Recommendation P.563 (2005)
4. ITU-T.: The E-Model, a computational model for use in transmission planning. International Telecommunications Union, Geneva, Switzerland, ITU-T Recommendation G.107 (2005)
5. Lecture Notes in Computer Science;A. Raja,2007