An excellent example of the formal approach to the design and building of passive audio filters is provided by the recent work of David Fentem / KW4M in his: A Passive LC Audio Filter for Amateur Radio Use As you can see after downloading and reviewing all the material, and if .
3 Introduction External audio filters are sometimes used to improve the selectivity or enhance the audio quality of amateur radio receivers. These filters are usually implemented as op-amp active filters, switched-capacitor filters, DSP-based filters, or some combination thereof.
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