prototype filter
2016-08-23
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prototype filter can be designed to fulfill Perfect Reconstruction (PR)
conditions or to provide Non Perfect Reconstruction (NPR) characteristics. In
the PR case, the resulting prototype filter is typically a spectral factor of
an Mth band (Nyquist) filter. However, it is worth emphasizing that the PR
property is exactly obtained only in the case of ideal transmission channel. In
our case, the PR conditions are not essential because it is sufficient that
filter bank structure based interferences are small enough compared to the
residual interferences due to transmission channel. Moreover, NPR designs are
more efficient than PR designs, e.g., in providing higher stopband attenuation
with given prototype filter length. The initial prototype filter is designed
using so-called frequency sampling technique.
matlab
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