Re: Half Band filter?
Half-band filter play an important role in multirate digital signal processing. FIR half-band filters are easily designed to exhibit exactly linear phase, but IIR half-band filters provide higher computation speed at the cost of the phase nonlinearity. Hence, the advantage of IIR half-band filters is evident for the applications where the computation speed, low power consumption and miniaturisation are the main requirements.
A half-band filter transfer function has to satisfy the passband stop-band symmetry conditions . This implies the constraints in the choice of the filter parameters: pass- stop-band ripples and pass- stop-band edge frequencies. For the appropriate usage of a digital filter design software in half-band filter design, it is necessary to calculate the exact relations between the above mentioned parameters in advance