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Aspects of delta modulation

University of British Columbia

The first part of this thesis describes the design and construction of a pulse communications system called delta modulation. A simple transistorized coder and decoder was built to convert speech signals into binary pulses, and back again. This system was tested in several ways: the circuit performance was checked electronically, and the quality of transmission through the system was judged by listening tests and by comparison with special tapes containing controlled amounts of signal and thermal noise. The second part concerns the design and construction of a compressor and expandor that can be used with a delta system in order to improve its transmission quality. A fast-acting compressor and expander was constructed using diode-bridges as non-linear elements. Tests of the two components used "back-to-back" showed a satisfactory matching of their characteristics. If these components were used with the delta modulation system, there would be a considerable increase in the range of signal levels that could be transmitted with reasonable quality.

Text

2012-02-24

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http://hdl.handle.net/2429/40884

Electrical and Computer Engineering

University of British Columbia

Graduate