Smoothing of Digital-To-Analog Converted Data in Digital Data Systems

摘要

A brief review of the properties of sampled signals is given, and used to describe systems which contain digital components. It is shown that the errors in such digital data systems are of two types, one due to the inaccuracies in the algorithm programmed, and the other due to the reconstruction process necessary to convert the digital data to analog form. The latter error only is discussed. A number of realizable smoothing filters, which can be used to improve the reconstruction accuracy over that obtainable directly by conventional digital-to-analog converters, are presented. The frequency responses of these filters are compared with the ideal recovery filter. Also discussed is the percent root mean square reconstruction error when these filters are used to recover a sampled sinusoid. Circuits are presented for the realization of these filters using standard analog computer components. (Author)