Quantizing a audiorecorder sample

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Kayne
Kayne 2012-7-12
回答： Image Analyst 2013-11-29
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
  1 个评论
Remi
Remi 2013-11-29
Any luck in this ?, If so it would be very helpful for me.
Thanks

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回答（1 个）

Image Analyst
Image Analyst 2013-11-29
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

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