Filter Gain
gain(C, f)—Returns the gain at frequency f of a filter with coefficients C.
C is a real or complex-valued vector or array of filter coefficients:
FIR filter: C has one column
IIR filter: C has column pairs:
column 1 contains coefficients of the numerator
column 2 contains coefficients of the denominator.
f is a positive real number (or real-valued vector) between 0 and 1. It represents the frequency as a fraction of the sampling frequency. Frequency is generally between 0 and 0.5.
f may be defined as a range variable.
Additional Information
The gain function is used to compute the complex gain of a digital Finite Impulse Response (FIR) or analog Infinite Impulse Response (IIR) filter.
IIR transfer functions must be normalized so that the constant term in the denominator is 1.
Was this helpful?