Return transfer function of overall prototype lowpass filter
Determine the transfer function of the overall prototype lowpass filter used for the filter bank in the
dsp.Channelizer System object.
Design a channelizer with the number of frequency bands or polyphase branches set to 8, the number of taps or coefficients per band set to 12, and stopband attenuation set to 80 dB. The function
tf returns the transfer function of the prototype lowpass filter.
channelizer = dsp.Channelizer; [num,den] = tf(channelizer);
View the magnitude response of the prototype lowpass filter using
num— Numerator coefficients
Numerator coefficients, returned as a row vector.
den— Denominator coefficients
Denominator coefficients, returned as a row vector. For a finite Impulse response (FIR) filter, this value is 1.