Pulse Time-Code Modulation System

In conventional systems of pulse-code modulation (PCM), the signal is sampled at a constant frequency, and pulse groups representing the signal amplitude are transmitted. The sampling frequency has to be related to the highest frequency in the signal; consequently, the sampling frequency is higher than is necessary during those times when the signal contains low frequencies resulting in the under-utilization of the transmission bandwidth. A new system has been developed, "PULSE TIME-CODE MODULATION" (PTCM) in which the sampling frequency is varied to suit the requirements of the signal. As a result, the number of samples to be transmitted over a period is reduced and a narrower bandwidth can be used. In the system investigated, a time delay of the signal is inevitably introduced and this may be a disadvantage in some applications.

Name dc:type.qualificationname

Ph.D.

Level dc:type.qualificationlevel

doctoral

Grantor dc:publisher.institution

Aston University

Year dc:date.issued

1978

Author dc:creator

• Mountis, Michael G.

DOI dc:identifier.doi

https://doi.org/10.48780/publications.aston.ac.uk.00008200

OAI identifier oai:identifier

oai:publications.aston.ac.uk:8200