一种有效的典型波形块内插方法

鲍长春

一种有效的典型波形块内插方法

鲍长春

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出版历程
- 收稿日期: 1997-12-10
- 修回日期: 1999-02-27
- 刊出日期: 1999-11-19

An Efficient Blockwise Interpolation Algorithm of Prototype Waveform

Bao Changchun

摘要

摘要: 本文将基音周期波形(PCW)在时间方向上逐个相位对齐,提出了一种新的线性预测残差(LPR)域典型波形(PW)提取和块内插方法。该方法可以避免内插后的PCW分界处的不连续而引起的听觉上的失真,同时也使得PW分界的选择不至于太严格。借助于这种PW提取和块内插方法,本文实现了一种2.4 kb/s线性预测编码方案,计算机模拟结果表明,该方案得到的重建语音与4.8 kb/s码激励线性预测算法接近。
- 语音编码; 线性预测; 波形内插; 矢量量化
Abstract: 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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参考文献(1)

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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