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Iteration-free pulse replacement method for algebraic codebook search

Iteration-free pulse replacement method for algebraic codebook search

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  • Author(s): E.D. Lee 1 ; S.H. Yun 2 ; S.I. Lee 1 ; J.M. Ahn 2
    • View affiliations
    • Affiliations: 1: Digital Broadcasting Research Division, Electronics and Telecommunications Research Institute, Daejeon, Korea
      2: Department of Electrical & Computer Engineering, Chungnam National University, Daejeon, Korea
  • Source: Volume 43, Issue 1, 4 January 2007, p. 59 – 60
    DOI:  10.1049/el:20073320 , Print ISSN 0013-5194, Online ISSN 1350-911X
© The Institution of Engineering and Technology
Published

A fast algebraic codebook search method based on iteration-free pulse replacement is proposed. The method comprises two stages. At the first stage, an initial codevector is determined by the pulse-position likelihood-estimate vector. At the second stage, after computing pulse-contributions for every track, the pulse replacement is performed to maximise the search criterion over all combinations, replacing the pulses of the initial codevector with the most important pulses for every track. Experimental results show that the proposed method is very efficient in terms of computational complexity and speech quality compared to previous pulse replacement methods.

Inspec keywords: speech coding; computational complexity; algebraic codes; maximum likelihood estimation

Other keywords: search criterion; iteration-free pulse replacement method; speech quality; algebraic codebook search; initial codevector; pulse-position likelihood-estimate vector; pulse-contributions; computational complexity

Subjects: Speech and audio coding; Speech processing techniques; Other topics in statistics; Other topics in statistics

References

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      • 3GPP TS 26.090, AMR Speech Codec; Transcoding Functions (Release 4), Mar. 2001.
    2. 2)
      • Ha, N.K.: `A fast search method of algebraic codebook by reordering search sequence', IEEE Int. Conf. on Acoustics Speech and Signal Processing, 1999, 1, p. 21–24.
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      • Adoul, J.-P., Mabilleau, P., Delprat, M., Morissette, S.: `Fast CELP coding based on algebraic codes', IEEE Int. Conf. on Acoustics, Speech and Signal Processing, 1987, p. 1957–1960.
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      • ITU-T Rec. G.723.1, Dual Rate Speech Coder for Multimedia Communications Transmitting at 5.3 and 6.3 kbit/s, Mar. 1996.
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      • ITU-T Rec. G.729, Coding of Speech at 8 kbit/s Using Conjugate-Structure Algebraic-Code-Excited Linear-Prediction (CS-ACELP), Mar. 1996.
    6. 6)
      • Lee, E.D., Lee, M.S., Kim, D.Y.: `Global pulse replacement method for fixed codebook search of ACELP speech codec', Proc. 2nd IASTED Int. Conf. on Communications, Internet and Information Technology, 2003, November 2003, p. 372–375.
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      • ITU-T Rec. G.729 Annex A, Reduced Complexity 8 kbit/s CS-ACELP Speech Codec, Nov. 1996.
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      • Park, H.C., Choi, Y.C., Lee, D.Y.: `Efficient codebook search method for ACELP speech codes', 2002 IEEE Speech Coding Workshop Proc., 2002, p. 17–19.
    9. 9)
      • Laflamme, C., Adoul, J.-P., Salami, R., Morissette, S., Mabilleau, P.: `16 kbps wideband speech coding technique based on algebraic CELP', IEEE Int. Conf. on Acoustics, Speech and Signal Processing, May 1991, p. 13–16.
    10. 10)
      • ITU-T Rec. G.729.1, G.729 based Embedded Variable Bit-Rate Coder: An 8-32 kbit/s Scalable Wideband Coder Bitstream Interoperable with G.729, May 2006.
    11. 11)
      • 3GPP2 C.S0030-0 Ver.2.0, Selectable Mode Vocoder Service Option for Wideband Spread Spectrum Communication Systems, Dec. 2001.
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