A new method of determining the performance of delta modulation systems
Abstract
A formula for signal to quantizing noise ratio in delta modulation systems is derived assuming only stationarity of the signal source. The three interesting terms in this expression are examined as a function of quantizing step size the relative sampling rate for three types of signal inputs. Computer simulation is used to obtain empirical results concerning the behavior of the three terms and a qualitative explanation for this behavior is offered. The analysis is undertaken from a total quantizing noise point of view; this gives an insight into system behavior that cannot be obtained by considering the effects of the signalcorrelated and signaluncorrelated components of quantizing noise separately. The entropy of the output of three adaptive source encoders, A delta M, APCM and ADPCM, is measured for speech input at low sampling rates. It is attempted to correlate the source encoder output entropies, normalized to the channel bit rate, with the results of informal listening tests.
 Publication:

Ph.D. Thesis
 Pub Date:
 1974
 Bibcode:
 1974PhDT........37A
 Keywords:

 Delta Modulation;
 Performance;
 Signal Processing;
 Computerized Simulation;
 Data Correlation;
 Signal Analysis;
 Communications and Radar