Urgent: half band FIR filter and low pass FIR filter

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cafukarfoo

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Hello all,

Anyone know what is the different between half band filter and low pass FIR filter.

For the moment, i think it is the same between both in term of formula below:
y = h(0)x + h(1)x(n-1) + h(2)x(n-2) ...

just that half of the coefficient is zero for the half band filter.

Can some one guide me here? THanks.
 

Hi,

Half band filter is also a lowpass FIR filter. The bandwidth of the filter is half of the Nyquist rate or quarter of the sampling rate and it makes half of the filter coefficients zero. The name 'Half-Band' comes from the fact it is using only half of the available bandwidth.

I hope it has helped.
 

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