Abstract

A recent paper in Geophysics by Shanks (1967) provides an excellent introduction to recursive or feedback digital filters. These filters do not appear to have been widely used in geophysics; for example, a recent review paper on the use of digital filters in geophysics (Kertz, 1965) does not mention them. The topic takes on added interest with the recent appearance of several papers following the original paper of Dean (1958), applying digital filter concepts to the analysis of gravity and magnetic data.

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