Determine the coefficients of the prototype lowpass filter in the dsp.Channelizer object using the coeffs function.

The coeffs function returns a structure, c. The structure field Numerator contains the coefficients as a row vector. The number of elements in the row vector, given by c.Numerator, equals the number of frequency bands times the number of coefficients per band. These values are given by the NumFrequencyBands and NumTapsPerBand properties of the dsp.Channelizer object.

channelizer = dsp.Channelizer;
c = coeffs(channelizer);

Visualize the impulse response of the filter using fvtool.

fvtool(c.Numerator,'impulse');