Abstract
A hybrid method is presented for the integration of low-, mid-, and
high-frequency driver filters in loud-speaker crossovers. The Pascal
matrix is exploited to calculate denominators; the locations of minimum
values in frequency magnitude responses are associated with the forms of
numerators; the maximum values are used to compute gain factors. The forms
of the resulting filters are based on the physical meanings of low-pass,
band-pass, and high-pass filters, an intuitive idea which is easy to be
understood. Moreover, each coefficient is believed to be simply
calculated, an advantage which keeps the software-implemented crossover
running smoothly even if crossover frequencies are being changed in real
time. This characteristic allows users to efficiently adjust the
bandwidths of the driver filters by subjective listening tests if
objective measurements of loudspeaker parameters are unavailable. Instead
of designing separate structures for a low-, mid-, and high-frequency
driver filter, by using the proposed techniques we can implement one
structure which merges three types of digital filters. Not only does the
integration architecture operate with low computational cost, but its size
is also compact. Design examples are included to illustrate the
effectiveness of the presented methodology
Go to article