The use of data filters in electronic circuits is normally considered undesirable because filtering irretrievably eliminates desirable as well as undesirable information. Filtering is necessary in some applications, however, to obtain any useful information from measurements made in high-noise and distorted environments and from FM tape-recording and carrier-frequency-type systems. This memorandum discusses related theory and special filter characteristics necessary for retaining the maximum useful information in a filtered signal, depending upon whether the desired data are periodic or transient in nature.
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The use of data filters in electronic circuits is normally considered undesirable because filtering irretrievably eliminates desirable as well as undesirable information. Filtering is necessary in some applications, however, to obtain any useful information from measurements made in high-noise and distorted environments and from FM tape-recording and carrier-frequency-type systems. This memorandum discusses related theory and special filter characteristics necessary for retaining the maximum useful information in a filtered signal, depending upon whether the desired data are periodic or transient in nature.
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