'What does it mean by 80 filterbanks, 40 MFCCs?

#Below are the parameters for baseline configuration. Which parameter we should change for 80 filterbanks and 40 MFCCs? and why.

preemph = 0.97              # pre-emphasis coeefficient\
frame_length_ms = 25        # frame length in ms\
frame_step_ms = 10          # frame shift in ms\
low_freq_hz = 0             # filterbank low frequency in Hz\
high_freq_hz = 8000         # filterbank high frequency in Hz\
nyquist = fs_hz / 2.0;      # Check the Nyquist frequency\
if high_freq_hz > nyquist:
   high_freq_hz = nyquist\
num_filters = 26            # number of mel-filters\
num_ceps = 12               # number of cepstral coefficients (excluding C0)\
cep_lifter = 22             # Cepstral liftering order\
eps = 0.001                 # Floor to avoid log(0)\


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