recording real sound data from microphone into matlab

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TESFAW 2014-8-7

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https://ww2.mathworks.cn/matlabcentral/answers/146717-recording-real-sound-data-from-microphone-into-matlab

编辑： TESFAW 2014-8-22

   Ns=2^17;
   Fs=44100;%in Hz              
   y=wavrecord(Ns,Fs,1,'double');
filename ='cdct.wav';
   wavwrite(y,Fs,filename);
   n=length(y);
   t=(0:(n-1))*Ns/n;
plot(y)
   xlabel('time in(sec)')
   ylabel('amplitude')
   titel('amp vs time')
    my questions are:
        1. I used this code to record the sound data ,but  I fail to determine 
              its fundamental frequency
          2.how can add a code for filtering during recording
             any help!10Q