Low bit rate coding using an interpolated zinc excitation model

Prototype excitation vocoding has been of particular interest, particularly at bit rates below 4 kbits/sec where conventional analysis by synthesis (AbS) LPC based coders fail to deliver the speech quality required in a number of new voice communication applications and services. The present authors...

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Bibliographic Details
Main Authors: Hiotakakos, D.J., Xydeas, C.S.
Format: Conference Proceeding
Language:English
Subjects:
Bit rate
Failure analysis
Filters
Prototypes
Signal analysis
Speech analysis
Speech coding
Speech processing
Speech synthesis
Zinc
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Summary:Prototype excitation vocoding has been of particular interest, particularly at bit rates below 4 kbits/sec where conventional analysis by synthesis (AbS) LPC based coders fail to deliver the speech quality required in a number of new voice communication applications and services. The present authors propose a new time domain, interpolated zinc function prototype excitation technique (IZFPE) for communications quality speech at about 2.0 kb/s. In this method a prototype pitch segment is selected every 20 ms. Each prototype segment is then modelled by a zinc orthogonal function which is derived by employing a closed loop AbS procedure (ZFE-AbS). Successive prototype zinc excitations are then interpolated such that the characteristics of the resulting excitation signal evolve slowly with time.< >
DOI:10.1109/ICCS.1994.474282