Application of Delta-Modulation to Television Systems

  • Malcolm J. Hawksford

Student thesis: Doctoral ThesisDoctor of Philosophy


Digital methods of pulse modulation are being widely applied in
the transmission of information over communication networks. The
thesis is primarily concerned with one specific class of pulse modulation
called delta-modulation. In its basic form, delta-modulation
represents the simplest and most economical method of digitally encoding
analogue signals.

The thesis discusses delta-modulation from a theoretical and
practical viewpoint. A mathematical model is presented which permits
a comprehensive understanding of the processes of delta-modulation.
The model can readily be extended to other forms of digital pulse modulation
and is therefore presented as a general method of analysing
digital-encoding systems. The theory develops the design requirements
of a delta-modulator and indicates methods of improving the encoding

The thesis describes a family of digital encoding systems for
colour television. These systems are discussed in relation to chromaticity.
Finally, a particular system is described, for which an experimental
model was built and tested. This system transmitted the
chrominance information during the line blanking period. The experimental
model functioned satisfactorily in real time with encoding rates
ranging, from 50 Mhz to 190 Mhz. At these pulse rates, subjective
assessment of the system was favourable.
Date of Award1972
Original languageEnglish


  • delta-modulation
  • television systems

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