400bps High-Quality Speech Coding Algorithm

Low bit rate speech coding is important to speech communications over band-limited or harsh channels. In this paper, based on the mixed excitation linear prediction (MELP) model, we propose a high-quality 400bps low bit rate speech coding algorithm which introduces multi-frame joint vector quantization, adaptive spectral enhancement and multi-band sinusoidal mixed excitation. Efficient parameter quantization schemes are employed on the basis of the super-frame structure. It is verified that the synthesized speech has fairly high intelligibility and naturalness, and the mean opinion score (MOS) is about 2.52.

[1]  Amir Hossein Rezaie,et al.  MELPe Coded Speech Hiding on Enhanced Full Rate Compressed Domain , 2010, 2010 Fourth Asia International Conference on Mathematical/Analytical Modelling and Computer Simulation.

[2]  Allen Gersho,et al.  A 1200 bps speech coder based on MELP , 2000, 2000 IEEE International Conference on Acoustics, Speech, and Signal Processing. Proceedings (Cat. No.00CH37100).

[3]  Bishnu S. Atal,et al.  A new model of LPC excitation for producing natural-sounding speech at low bit rates , 1982, ICASSP.

[4]  Li Hui.  An Improved MELP Speech Coder , 2003 .

[5]  William M. Campbell,et al.  Multisensor MELPe using parameter substitution , 2004, 2004 IEEE International Conference on Acoustics, Speech, and Signal Processing.

[6]  John S. Collura,et al.  MELP: the new Federal Standard at 2400 bps , 1997, 1997 IEEE International Conference on Acoustics, Speech, and Signal Processing.

[7]  Thomas F. Quatieri,et al.  Sinusoidal transform coding , 1988 .

[8]  Thomas P. Barnwell,et al.  A 2.4 kbit/s MELP coder candidate for the new U.S. Federal Standard , 1996, 1996 IEEE International Conference on Acoustics, Speech, and Signal Processing Conference Proceedings.

[9]  Ye Li,et al.  An 800 bps vocoder based on Mixed Excitation Linear Prediction , 2015 .

[10]  Qiang Li,et al.  A design of 0.9kb/s speech coding algorithm based on MELPe , 2012, 2012 5th International Congress on Image and Signal Processing.

[11]  Nicolae Tapus,et al.  Real time implementation of MELP speech compression algorithm using Blackfin processors , 2015, 2015 9th International Symposium on Image and Signal Processing and Analysis (ISPA).

[12]  Willem Bastiaan Kleijn,et al.  Improved speech quality and efficient vector quantization in SELP , 1988, ICASSP-88., International Conference on Acoustics, Speech, and Signal Processing.

[13]  John C. Hardwick,et al.  A 4.8 kbps multi-band excitation speech coder , 1988, ICASSP-88., International Conference on Acoustics, Speech, and Signal Processing.

[14]  Mary A. Kohler.  A comparison of the new 2400 bps MELP Federal Standard with other standard coders , 1997, 1997 IEEE International Conference on Acoustics, Speech, and Signal Processing.