Of Poles and Zeros : Fundamentals of Digital Seismology (Modern Approaches in Geophysics Vol.15) (2nd ed. 2001. 280 p.)

It covers the basic theory of linear systems, the design and analysis of simple digital filters, the effect of sampling and A/D conversion, the calculation of 'true ground motion', and the effects of seismic recording systems on parameters extracted from digital seismograms.