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Abstract

The purpose of this thesis is to introduce Delta
Modulation as an alternative to the more conventional carrier
and pulse modulations,
Chapter I briefly discusses the carrier and pulse
modulations from the standpoint of signal - to - noise ratio,
bandwidth occupancy and threshold effects. In this way, the
merits of each is brought to the fore and the superiority of
FM and PCM can he seen.
Chapter II introduces Delta Modulation, a pulse code
modulation, giving an extensive review of much of the more
prominent literature on the subject. Aspects such as channel
capacity, power, spectral densities, overloading, signal - to - noise
ratio and bandwidth, are discussed.
In Chapter III an experimental Delta-Sigma Modulation
System is described in detail, from design to performance.
Observations are made which correspond to some made in theory.
The system transmits static signals and AC signals up to 20 HZ.
The accuracy is good and the circuits simple.
In Chapter IV suggestions are made to improve the
systemis performance by simple means. Also mentioned are more
elaborate means (Continuous Delta Modulation) which enhance the
performance considerably but detract from the simplicity.
Much of the literature quoted in the bibliography shows
and discusses how delta modulation is simple in circuitry yet
has all the advantages of PCM. It is upon this theme that the
prototype Delta-Sigma Modulator is designed and built. All the
circuits are kept as simple as possible. With integrated circuits,
delta modulation is fast becoming an economical proposition. Delta modulation, though simple to implement, requires greater bandwidth than the conventional carrier modulations
and PCM (for the same performance). At times this would make
Delta Modulation uneconomical. However, there is a place for
Delta Modulation alongside FM and PCM for some particular
applications.

Item Type:	Thesis - Unspecified
Authors/Creators:	Greig, DJ
Keywords:	Pulse modulation (Electronics), Pulse techniques (Electronics)
Copyright Holders:	The Author
Copyright Information:	Copyright 1969 the Author - The University is continuing to endeavour to trace the copyright owner(s) and in the meantime this item has been reproduced here in good faith. We would be pleased to hear from the copyright owner(s).
Additional Information:	Thesis (M.Eng.Sc.) - University of Tasmania, 1969
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