ABSTRACT
The field of signal processing as applied to telemetry systems is diverse. This chapter discusses the necessary bandwidth to allow reasonable reconstruction of sampled signals and describes the required sampling rates for signals based upon their effective bandwidths. It examines the operating principles of and the various types of sample-and-hold and analog-to-digital conversion circuits and explores the total volume of data to be transmitted for a measurement system. The system designer has two variables to consider in configuring the pulse coded modulation (PCM) sampling: the rate at which the samples are taken and the number of conversion levels used to represent the signal. The PCM signal must be bandlimited for proper sampling and reconstruction. Signal bandwith has several different definitions based upon the needs of the application. Quantization can be performed at a variety of degrees of resolution. The resolution the designer selects will determine the quality of the reconstructed signal.
