Delta modulation techniques for low bit-rate digital speech encoding

Master Thesis

1985

Permanent link to this Item
http://hdl.handle.net/11427/7587
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thesis_ebe_1985_irvine_jm.pdf (5.1 MB)
Authors
Irvine, James Moir
Supervisors
Bradlow, Hugh
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University of Cape Town

Department
Department of Electrical Engineering
Faculty
Faculty of Engineering and the Built Environment
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Abstract
Two new hybrid companding delta modulators for speech encoding are presented here. These modulators differ from the Hybrid Companding Delta Modulator (HCDM) proposed by Un et al in that the two new encoders employ Song Voice Adaptation as the basis of the instantaneous compandor, rather than Constant Factor adaptation. A detailed analysis of the performance, both objective and subjective, of these hybrid codecs has been carried out. Results show that overall the two codecs developed as part of this project are better than the HCDM codec. In addition the new codecs offer simpler implementation in digital hardware than the HCDM. A Computer Aided Test (CAT) system has been developed to simplify the design and test processes for speech codecs.
Description

Includes bibliography.

Keywords
Electrical and electronic engineering

Reference:

Irvine, J. 1985. Delta modulation techniques for low bit-rate digital speech encoding. University of Cape Town.

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