HTK file writing parameters problem

% Open file for writing:
fid = fopen(filename, 'w', 'ieee-be');

% Write the header information% 
fwrite(fid, nSamples, 'int32');   % number of vectors in file (4 byteint)
fwrite(fid, sampPeriod, 'int32'); % sample period in 100ns units (4 byte int)
fwrite(fid, sampSize, 'int16');   % number of bytes per sample (2 byte int)
fwrite(fid, parmKind, 'int16');   % code for the sample kind (2 byte int)

% Write the data: one coefficient at a time:
for i = 1:nSamples     
   for j = 1:numVecHead        
     fwrite(fid, data(j, i), 'float32');    
   end
end

I have some given code about writing a HTK file, but I am not sure what is the parameter of it. Let's say I am using audiorecorder to record a sound.

r = audiorecorder(16000,16,1);

After I got a audio data (x) from r, what do I need to fill into the parameter of the code?

nSamples, sampPeriod, sampSize, parmKind, numVecHead

Thanks