Image Processing Reference
In-Depth Information
Fig. 18. Decimating allpass-based minimum-phase IIR COHBF, n
=
5: (a) optimum SFG (b)
the 1st (2nd) order allpass section, i
=
0, 1
Fig. 19. Block structure of decimating (a) and interpolating (b) minimum-phase IIR COHBF
main emphasis has been put on the presentation of optimum implementations that call for
minimum computational burden.
It has been confirmed that, for the even-numbered centre frequencies c
,MP
IIR HBF outperform their LP FIR counterparts the more the tighter the filter specifications.
However, for phase sensitive applications (e.g. software radio employing quadrature
amplitude modulation), the LP property of FIR HBF may justify the higher amount of
computation to some extent.
In the case of the odd-numbered HBF centre frequencies of (2), c
∈ {
0, 2, 4, 6
}
∈ {
}
,thereexist
specification domains, where the computational loads of complex FIR HBF with frequency
offset range below those of their IIR counterparts. This is confirmed by the two bottom rows
of Table 7, where this table lists the expenditure of a twofold decimator based on the design
examples given in Fig. 11 for all centre frequencies and all applications investigated in this
1, 3, 5, 7
Search WWH ::




Custom Search