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. / Applied Science, Faculty of / Electrical and Computer Engineering, Department of / Graduate
| Identifer | oai:union.ndltd.org:UBC/oai:circle.library.ubc.ca:2429/40884 |
| Date | January 1959 |
| Creators | De Faye, Philippe John |
| Publisher | University of British Columbia |
| Source Sets | University of British Columbia |
| Language | English |
| Detected Language | English |
| Type | Text, Thesis/Dissertation |
| Rights | For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use. |
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