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Volume 21 Issue 6
Nov.  1999
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Bao Changchun. An Efficient Blockwise Interpolation Algorithm of Prototype Waveform[J]. Journal of Electronics & Information Technology, 1999, 21(6): 743-751.
Citation: Bao Changchun. An Efficient Blockwise Interpolation Algorithm of Prototype Waveform[J]. Journal of Electronics & Information Technology, 1999, 21(6): 743-751.

An Efficient Blockwise Interpolation Algorithm of Prototype Waveform

  • Received Date: 1997-12-10
  • Rev Recd Date: 1999-02-27
  • Publish Date: 1999-11-19
  • A new kind of method of prototype waveforme extraction and blockwise interpolation in linear predictive residual(LPR) domain was suggested by aligning phase of Pitch-Cycle waveform(PCW) along the time axis one by one. This method may avoid the perceptual distortion due to discontinuities near boundaries of interpolated PCW. At the same time, it made the boundary selection of prototype waveform not too strict. a novel 2.4 kb/s LPC speech coding model was established based on thus extraction and blockwise interpolation of the prototype waveform(PW). The computer simulation results shown that the reconstructed speech quality with this model closed to CELP algorithm at 4.8 kb/s.
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  • Schroeder M R, Atal B S. Code-excited linear predictive(CELP): High qaulity speech at very low[2]bit rates. in Proc. ICASSP, 1985, 937-940.[3]Kleijn W B. Analysis-by-synthesis speech coding based on relaxed waveform-matching constraints:[4][Ph.D.thesis]. Delft University of Techpolygy, Delft, The Netherlands: 1991.[5]Kleijn W B. Continuous representations in linear predictive coding, Proc. ICASSP91, Toronto:501-504.[6]Kleijn W B, Granzow W. Waveform Interpolation in Speech Coding. in the Speech and Audio Coding for Wireless and Network Applications, edited by B. S. Atal, Vladimir Cuperman and Allen Gersho, 1993, 111-118.[7]Kleijn W B. Encoding speech using prototype waveforms. IEEE bans. on Speech and Audio Process. 1993, 1(4): 386-399.[8]Shoham Y. Constrained-excitation coding of speech at 4.8kb/s. in Advances in Speech Coding[9]edited by B S. Atal, Vladimir Cuperman and Allen Gersho, 1991, 339-348.[10]Granzow W, Atal B S, Paliwal K K, Schroeter J. Speech coding at 4kb/s and lower using single-[11]pulse and stochastic models of excitation. Proc. ICASSP91, 1991, 217-220.[12]Sundberg J. Maximum speed of pitch changes in singers and untrained subjects, Journal of Phonetics, 1979, 7(1): 71-79.[13]Gersho A, Gray R M. Vector Quantization and Signal Compression. Kluwer Academic Publisher, 1991.[14]鲍长春, 等. 线谱频率参数的分裂矢量量化.电子科学学刊,1998, 20(4), 508-513.[15]鲍长春, 等. 基于归一化互相关函数的基音检测算法. 通信学报,1998, 19(10): 27-31. [12] 鲍长春, 等. 低速率声码器中残差谱的变维矢量量化, 电子学报,1999,21(1): 7-13.
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      沈阳化工大学材料科学与工程学院 沈阳 110142

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