This project deals with the critical evaluation of a Poisson
windowed test signal which was proposed for in-service and
production testing of filtered pulse code modulation systems. The
Poisson windowed test signal has various advantages over the
existing two test methods specified by the International
Consultive Committee for Telephone and Telegraph (CCITT). The
main goals of the new test signal are to minimise the test time
and to accommodate the send- and reel eve filters normally found in
communication systems.
The evaluation process included the compilation of performance
curves of signal ,to noise ratio vs. signal level and gain
variation vs. signal level. These curves were compiled by
simulating the codec and filters on a digital computer and
processing the output data. Three sets of programs were
The results obtained revealed some fundamental limitations of the
proposed test signal. Using the basic properties of the Poisson
windowed signal, an alternative test signal was proposed. It was
the single sided exponentially windowed sinusoidal which proved
to be suitable for the testing of filtered pulse code modulation
stems.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:wits/oai:wiredspace.wits.ac.za:10539/16550 |
| Date | 15 January 2015 |
| Creators | Cronje, Bernhard |
| Source Sets | South African National ETD Portal |
| Language | English |
| Detected Language | English |
| Type | Thesis |
| Format | application/pdf |
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