Digitone signal detectionPublic Deposited
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This thesis deals with the investigation of detection techniques, suitable for microminiaturization, which can be employed to design receivers for Digitone signals, the design of some of the receivers, and their performance evaluation. A number of detection techniques are reviewed such as RC Discriminator Detection, Correlation Detection, Matched Filter Detection, Receiver Design by Decision Theory, Detection by Sampling, Differential Detection, Limiter-Discrirainator Detection, Zero-Crossing Detection, Cycle Counting Detection and Phase Lock Loop Discriminator Detection. Of these, Zero-Crossing and Phase Lock Loop Discriminator Detection are used to design receivers for Digitone signals, as designs based on these methods can be easily microminiaturized. Two different designs using Zero-Crossing technique i.e. Zero Crossing Receiver Model I and Zero-Crossing Receiver Model II are given. The latter is a simplified version of the former. Receiver performance evaluation of detectors built in the laboratory indicates that both Zero-Crossing and Phase Lock Loop Discriminator techniques can be used to detect Digitone signals. However, Phase Lock Loop Discriminator performance is superior to Zero-Crossing. This is due to its higher inherent noise immunity as compared to Zero-Crossing which performs satisfactorily only for S/N ratios higher than 20 dB, its not requiring band pass filters of as ideal characteristics as that required by the Zero-Crossing detector and its design being more suitable for microminiaturization because it uses lesser number of resistors and capacitors.
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