Digital Speech Transmission: Enhancement, Coding and Error ConcealmentThe enormous advances in digital signal processing (DSP) technology have contributed to the wide dissemination and success of speech communication devices - be it GSM and UMTS mobile telephones, digital hearing aids, or human-machine interfaces. Digital speech transmission techniques play an important role in these applications, all the more because high quality speech transmission remains essential in all current and next generation communication networks. Enhancement, coding and error concealment techniques improve the transmitted speech signal at all stages of the transmission chain, from the acoustic front-end to the sound reproduction at the receiver. Advanced speech processing algorithms help to mitigate a number of physical and technological limitations such as background noise, bandwidth restrictions, shortage of radio frequencies, and transmission errors. Digital Speech Transmission provides a single-source, comprehensive guide to the fundamental issues, algorithms, standards, and trends in speech signal processing and speech communication technology. The authors give a solid, accessible overview of * fundamentals of speech signal processing * speech coding, including new speech coders for GSM and UMTS * error concealment by soft decoding * artificial bandwidth extension of speech signals * single and multi-channel noise reduction * acoustic echo cancellation This text is an invaluable resource for engineers, researchers, academics, and graduate students in the areas of communications, electrical engineering, and information technology. |
Contents
| 1 | |
| 5 | |
3 Spectral Transformations | 35 |
4 Filter Banks for Spectral Analysis and Synthesis | 73 |
5 Stochastic Signals and Estimation | 119 |
6 Linear Prediction | 163 |
7 Quantization | 201 |
8 Speech Coding | 239 |
9 Error Concealment and Soft Decision Source Decoding | 315 |
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Common terms and phrases
ˆxi 3GPP Acoustic Echo acoustic echo cancellation adaptive Adaptive Multi-Rate algorithm amplitude AMR-WB Audio beamformer bit rate Block diagram CELP channel code book codec complexity computational Conference on Acoustics convolution correlation decimation delay denotes density DFT coefficients Digital echo cancellation error concealment estimate excitation signal Figure filter filter bank frame frequency domain frequency response function Gaussian IEEE IEEE International Conference IEEE Transactions impulse response ITU-T Rec kbit/s length linear prediction lowpass magnitude microphone signals narrowband NLMS algorithm noise power noise reduction noise shaping obtain optimal output parameter postfilter predictor probability random variables reduced residual signal sampling rate Section segments sequence short-term shown in Fig Signal Processing ICASSP signal x(k soft decision Speech Coding Speech Enhancement speech quality speech signal stepsize synthesis filter transmission values vector quantization vocal tract wideband speech Wiener filter xµ(k z-transform zero