Abstract

Speech compression is one of the leading vicinity of digital signal processing that spotlight on dipping the bit rate of speech signals for transmission and storage devoid of considerable loss of quality. In past decades many speech coding techniques have been proposed for speech analysis. This paper attempts to assess and compare two compression techniques on speech signals. To execute this idea we have chosen two low bit rate and widely used speech analysis methods called VELP and MELP. The performances of both are evaluated by performing objective quality tests including PESQ, IS and CEP. Similar speech files are tested with both coders. The objective assessments show that at low bit rate the MELP shows better performance as compared to VELP.

References

• Milan Z. Markovic, "Speech Compression – Recent Advances and Standardization", 19-21 September 2001, NiS, Yugoslavia.
• John S. Collura, Diane F. Brandt, Douglas J. Rahikka, "The 1. 2 Kbps/2. 4Kbps MELP Speech Coding Suite with Integrated Noise Pre Processing", IEEE, National Security Agency, 2002.
• Chin-Chen Chang, Richard Char-Tung Lee, Guang- Xue Xiao, Tung-Shou C!hen, "A New Speech Hiding Scheme Based upon Sub-Band Coding", ICICS-PCM, 15-18DemnbcrZ003 Singapore.
• G. Rajesh, A. Kumar, K. Ranjeet, "Speech Compression using Different Transform Techniques International Conference on Computer & Communication Technology (ICCCT), 2011.
• Lann M Supplee, Ronald P Cohn, John S. Collura from US DOD and Alan V McCree from Corporate R&D , TI, Dallas, MELP: The New Federal Standard at 2400 bps.
• ITU-T: ITU-T Recommendation P. 862: Perceptual Evaluation of Quality (PESQ): An Objective Method for End-to-End Speech Quality Assessment of Narrow-Band Telephone Networks and Speech Codecs (2001).
• Ma, J. , Hu, Y. , Loizou, P. C. : Objective measures for predicting speech intelligibility in the noisy conditions based on new band-importance functions. J. Acoust. Soc. Am. 125(5), 3387–3405 (2009).
• Hu, Y. , Loizou, P. C. : Evaluation of objective quality measures for speech enhancement. IEEE Trans. Audio Speech Lang. Process. 16(1), 229–238(2008).
• B. S. Atal, M. R. Schroeder, and V. Stover, "Voice-Excited Predictive Coding System for Low Bit-Rate Transmission of Speech", Proc. ICC, pp. 30-37 to 30-40, 1975.
• C. J. Weinstein, "A Linear Predictive Vocoder with Voice Excitation", Proc. Eascon, September 1975.
• Raza, M. A. , "Implementation of Voice Excited Linear Predictive Coding (VELP) on TMS320C6711 DSP Kit", 9th International Multitopic Conference, IEEE INMIC, 2005.
• McPherson, T. , Jr , "PCM speech compression via ADPCM/TASI", Acoustics, Speech, and Signal Processing, IEEE International Conference on ICASSP '77. 1977.
• Madrid, K. M. , Tan, E. C. , Guevara, R. C. L, "Low bit-rate wideband LP and wideband sinusoidal parametric speech coders" ,TENCON 2004. 2004 IEEE Region 10 Conference.
• Haagen, J. Nielsen, H. ; Hansen, S. D. , "A 2. 4 kbps high-quality speech coder", Acoustics, Speech, and Signal Processing, 1991. ICASSP-91, 1991 International Conference on 14-17 Apr 1991.
• Barbara Resch, Mattias Nilsson , Anders Ekman , W. Bastiaan Kleijn, "Estimation of the Instantaneous Pitch of Speech", Audio, Speech, and Language Processing, IEEE Transactions on March 2007.
• Itoh, Y. Tajima, K. ; Kuwabara, N. , "Measurement of subjective communication quality for optical mobile communication systems by using mean opinion score", Personal, Indoor and Mobile Radio Communications, 2000. PIMRC 2000. The 11th IEEE International Symposium on 2000.
• Kitawaki, N. Nagabuchi, H. Itoh, K. , "Objective quality evaluation for low-bit-rate speech coding systems ", Selected Areas in Communications, IEEE Journal, Feb 1988.
• Enqvist, P. Karlsson, J. , " Minimal Itakura-Saito distance and covariance interpolation", Decision and Control, 2008. CDC 2008. 47th IEEE Conference 9-11 Dec. 2008