Variable Rate Speech Coding

An important goal in the design of voice communication networks and storage systems is to maximize capacity while maintaining an acceptable level of voice quality. Conventional speech coding systems use a fixed bit rate regardless of factors such as local speech statistics, transmission channel conditions, or network load. One method of maximizing capacity while maintaining an acceptable level of speech quality is to allow the bit rate to vary as a function of these factors. Variable rate speech coders exploit two important characteristics of speech communications: the large percentage of silence during conversations, and the large local changes in the minimal rate required to achieve a given speech reproduction quality.

[1]  Vladimir Cuperman,et al.  A multi-mode variable rate CELP coder based on frame classification , 1993, Proceedings of ICC '93 - IEEE International Conference on Communications.

[2]  David J. Goodman.  Embedded DPCM for Variable Bit Rate Transmission , 1980, IEEE Trans. Commun..

[3]  Mostafa Hashem Sherif,et al.  Voice Packetization and Compression in Broadband ATM Networks , 1991, IEEE J. Sel. Areas Commun..

[4]  Y. Yatsuzuka,et al.  A variable rate coding by APC with maximum likelihood quantization from 4.8 kbits/s to 16 kbits/s , 1986, ICASSP '86. IEEE International Conference on Acoustics, Speech, and Signal Processing.

[5]  Allen Gersho,et al.  Real-time vector APC speech coding at 4800 bps with adaptive postfiltering , 1987, ICASSP '87. IEEE International Conference on Acoustics, Speech, and Signal Processing.

[6]  Manfred R. Schroeder,et al.  Code-excited linear prediction(CELP): High-quality speech at very low bit rates , 1985, ICASSP '85. IEEE International Conference on Acoustics, Speech, and Signal Processing.

[7]  R. E. Crochiere,et al.  Variable rate coding of speech , 1979, The Bell System Technical Journal.

[8]  David J. Goodman,et al.  Cellular packet communications , 1990, IEEE Trans. Commun..

[9]  Rosario Drogo de Iacovo,et al.  Embedded CELP coding for variable bit-rate between 6.4 and 9.6 kbit/s , 1991, [Proceedings] ICASSP 91: 1991 International Conference on Acoustics, Speech, and Signal Processing.

[10]  Y. Yatsuzuka,et al.  High-Gain Digital Speech Interpolation with Adaptive Differential PCM Encoding , 1982, IEEE Trans. Commun..

[11]  William R. Gardner,et al.  QCELP: A Variable Rate Speech Coder for CDMA Digital Cellular , 1993 .

[12]  Allen Gersho,et al.  An overview of variable rate speech coding for cellular networks , 1992, 1992 IEEE International Conference on Selected Topics in Wireless Communications.

[13]  Paul K. M. Ho,et al.  Variable rate speech and channel coding for mobile communication , 1994, Proceedings of IEEE Vehicular Technology Conference (VTC).

[14]  Mostafa Hashem Sherif,et al.  Voice Packetization and Compression in Broadband , 1991 .

[15]  I. A. Gerson,et al.  Vector sum excited linear prediction (VSELP) speech coding at 8 kbps , 1990, International Conference on Acoustics, Speech, and Signal Processing.

[16]  Ira Alan Gerson,et al.  Vector Sum Excited Linear Prediction (VSELP) , 1991 .

[17]  Paul T. Brady,et al.  A technique for investigating on-off patterns of speech , 1965 .

[18]  K. Bullington,et al.  Engineering aspects of TASI , 1959 .

[19]  Kazuhiro Kondo,et al.  Variable rate embedded ADPCM coding scheme for packet speech on ATM networks , 1990, [Proceedings] GLOBECOM '90: IEEE Global Telecommunications Conference and Exhibition.

[20]  S. Kay.  Extended-TDMA a high capacity evolution of US digital cellular , 1992, 1st International Conference on Universal Personal Communications - ICUPC '92 Proceedings.

[21]  Arne A. Nilsson,et al.  Digital Speech Interpolation for Variable Rate Coders with Application to Subband Coding , 1985, IEEE Trans. Commun..

[22]  D. J. Goodman,et al.  Combined source and channel coding for variable-bit-rate speech transmission , 1983, The Bell System Technical Journal.

[23]  Ken-ichi Sato,et al.  Variable rate speech coding for asynchronous transfer mode , 1990, IEEE Trans. Commun..

[24]  Allen Gersho,et al.  Variable bit-rate CELP coding of speech with phonetic classification , 1994, Eur. Trans. Telecommun..