Hi Manash,
If you want the rate of pitch estimates to be higher, you will need to increase the overlap length:
p = pitch(aud,app.recObj.SampleRate,'WindowLength',round(fs*.05),'OverlapLength',round(fs*.05)-1);
This will generate a pitch estimate for windows with a maximum overlap.
I suggest you first throw away silence from your signal (using the function detectSpeech) before getting the pitch. That will eliminate parts of the signal where pitch does not apply.
You can further smooth the signal with median filtering. There is a parameter on this function that allows you to control the length of the median filter.
