what front end change for 20 k data is needed

[cmu_rocks_16]

Hi

I am trying to train and recognize on 20k data but I am not sure on what
changes should I make in the front end part of the following

1. the make_feats script for traning

I know the -srate thing I did -srate 20000 where it is calling the wave2feat

but what should the following parameters be changed to

-nfilt 40
-ncep 13
-lowerf 133.33334
-upperf 6855.4976
-nfft 512

1. I am also not sure on the change in the front end of the config file for Sphinx 4
   I mean what change should I make in the mel freq part of the front end

<component name="melFilterBank" type="edu.cmu.sphinx.frontend.frequencywarp.MelFrequencyFilterBank">
<property name="numberFilters" value="31">
<property name="minimumFrequency" value="200">
<property name="maximumFrequency" value="3500">
</property></property></property></component>

please help me thank you in advance