DSpace About DSpace Software
 

Dyuthi @ CUSAT >
e-SCHOLARSHIP >
School of Management Studies >
Faculty >
Dr.Jagathy Raj V P >

Please use this identifier to cite or link to this item: http://purl.org/purl/4500

Title: Quadratic Predictor based Differential Encoding and Decoding of Speech Signals
Authors: Jagathy Raj, V P
Hari, V S
Gopikakumari, R
Keywords: DPCM
predictor
prediction error
quadratic filter
singular value decomposition
Volterra series
Issue Date: 10-Feb-2011
Publisher: IEEE
Abstract: Modeling nonlinear systems using Volterra series is a century old method but practical realizations were hampered by inadequate hardware to handle the increased computational complexity stemming from its use. But interest is renewed recently, in designing and implementing filters which can model much of the polynomial nonlinearities inherent in practical systems. The key advantage in resorting to Volterra power series for this purpose is that nonlinear filters so designed can be made to work in parallel with the existing LTI systems, yielding improved performance. This paper describes the inclusion of a quadratic predictor (with nonlinearity order 2) with a linear predictor in an analog source coding system. Analog coding schemes generally ignore the source generation mechanisms but focuses on high fidelity reconstruction at the receiver. The widely used method of differential pnlse code modulation (DPCM) for speech transmission uses a linear predictor to estimate the next possible value of the input speech signal. But this linear system do not account for the inherent nonlinearities in speech signals arising out of multiple reflections in the vocal tract. So a quadratic predictor is designed and implemented in parallel with the linear predictor to yield improved mean square error performance. The augmented speech coder is tested on speech signals transmitted over an additive white gaussian noise (AWGN) channel.
Description: Communications and Signal Processing (ICCSP), 2011 International Conference on
URI: http://dyuthi.cusat.ac.in/purl/4500
Appears in Collections:Dr.Jagathy Raj V P

Files in This Item:

File Description SizeFormat
Quadratic Predictor based Differential Encoding andDecoding of Speech Signals.pdfpdf864.23 kBAdobe PDFView/Open
View Statistics

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

 

Valid XHTML 1.0! DSpace Software Copyright © 2002-2010  Duraspace - Feedback