Chapter 12
Bandpass and Notch Filters
This chapter deals with bandpass and notch filters. Bandpass filters as such are rarely used in performing the basic band-splitting functions of a crossover, but they can be useful for equalisation purposes and are essential for putting together high-order allpass filters for time correction. Bandpass filters are essential for filler-driver crossover schemes. Notch filters can also be useful for equalisation, but their most important use is in the construction of notch crossovers, whether based on elliptical filters or other sorts of filtering.
Multiple-Feedback Bandpass Filters
When a bandpass filter of modest Q is required, the multiple-feedback or Rauch type shown in Figure 12.1 has many advantages. The ...
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