EC354

Speech Processing                                         (3-0-0) 3

 
Nature  of speech signal- Speech    production    mechanism.  Classification   of  speech  sounds. Digital  processing  of  speech   signals. Significance of short-time analysis.

Linear predictive coding of speech-   linear   prediction  problem in   time  domain, normal equations, Relationship of linear  prediction to  autocorrelation and spectral domains.

Time domain and frequency domain methods for speech processing-  methods for extracting  the time-domain  parameters. Zero crossings. Auto correlation function. pitch estimation. Short - time Fourier analysis.  Filter  bank analysis. Format extraction and pitch extraction. Analysis-synthesis systems.

Homomorphic speech analysis- Cepstral  analysis, formant  and   pitch  estimation. Applications to speech recognition and speaker identification. Basic pattern recognition methods, codebooks, HMM’s.

Speech codec standards and applications- Standards for low bit rate vocoders; Vocoder attributes. Encoders and decoders of G723.1, G726, G727, G728, G729 standard vocoders. Basics of voice over IP. Voice quality measures in IP networks.

References

T.F.Quatieri: Discrete-time  Speech Signal Processing, Prentice-Hall, PTR, 2001.
L.Hanza etal, Voice Compression and Communications, Wiley/IEEE , 2001.
L.R.Rabiner AND R.W.Schafer: Digital processing of speech signals, Prentice     Hall,1978.
Hersent etal, IP Telephony, Pearson, 2000.