Linear time domain filters are useful in data processing and as models of physical systems. This chapter reviews examples of digital filter design methods, with applications to data processing, as approximations to physical systems (a seismometer is used as an example) and as a description of physical processes such as echoes and reverberations, gravity anomalies, and ground motion amplification in an earthquake. The focus here is on time domain filters. However, many of these problems may also be addressed in the frequency domain using the Discrete Fourier Transform.
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