Feedback Comb Filter Amplitude Response
Figure 2.26 shows a family of feedback-comb-filter amplitude responses, obtained using a selection of feedback coefficients.
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Figure 2.27 shows a similar family obtained using negated feedback coefficients; the opposite sign of the feedback exchanges the peaks and valleys in the amplitude response.
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As introduced in §2.6.2 above, a class of feedback comb filters can be defined as any difference equation of the form


so that the amplitude response is





For , the feedback-comb amplitude response
reduces to





Note that produces resonant peaks at


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Filtered-Feedback Comb Filters
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Feedforward Comb Filter Amplitude Response