Quantizing a audiorecorder sample

Hi,

I have used the audiorecorder() function in Matlab to record my voice with the following script

 fs = 4000;
tmax = 4;
nbits =16;
nchan = 1;

 %Now record my voice for x second 
Recorder = audiorecorder(fs,nbits,nchan);
record(Recorder);
fprintf(1,'recording....\n');
pause(tmax);
stop(Recorder);

 %covert to floating-point vector and play back
yi = getaudiodata(Recorder,'int16');
y = double(yi);
y = y/max(abs(y));
plot(y)
sound(y,fs);if true

end

I would like to now quantize the audio sample from 16bit and remove the least significant bit eventually until there is only 1 bit left.

I have been trying to use the quantize function but I am not sure how to make it work with my script. Thats if it can be done using this function to start with.

Any guidance would be great.

Thanks

[Remi]

Any luck in this ?, If so it would be very helpful for me.

Thanks

Answer 1

[Image Analyst]

Just either use bitshift(), or divide your image by 2 at each step. Here it is both ways:

y=uint16(341)
y1 = y
dec2bin(y)
while y > 1
  % Method 1: using bitshift
  y = bitshift(y, -1)
  dec2bin(y)
  % Method 2: using division.
  y1 = uint16(floor(double(y1)/2))
  dec2bin(y1)
end