Resample and convert into PCM

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João
João 2019-2-7
回答： João 2019-2-8
Hello,
First of all I'm using rMATLAB2018.
I'm trying to resample an audio file with sampling rate 44100 Hz to 22050 Hz and then convert the last one into a PCM with 16 bits.
The resample was an easy step but I'm struggling to convert to PCM 16 bits...
This is my attempt:
[x, fs] = audioread(a_filename);
% resample:
fsin = fs;
fsout = 22050;
m = lcm(fsin,fsout);
up = m/fsin;
down = m/fsout;
x_22 = resample(x, up, down);
audiowrite([a_filename,'_22050','.wav'], x_22, fsout);
% convert to PCM 16 bit
fid = fopen([a_filename,'_22050','.wav'], 'r'); % Open wav file
wF = fread (fid, inf, 'int16');% 16-bit signed integer
fwrite(wF,'short');
fclose(fid);
I'm getting this error message:
Error using fwrite
Invalid file identifier. Use fopen to generate a valid file identifier.
What am I doing wrong here? Thank you.

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采纳的回答

João
João 2019-2-8
I get it:
% convert to PCM 16 bit
precision = 'int16';
fidr = fopen([a_filename(1:11), '_22050','.wav'], 'r'); % open .wav file to read
fidw = fopen([a_filename(1:11), '_22050','.pcm'], 'wb'); % open .pcm file to write
w = int16(fread(fidr, inf, precision));% read .wav file
fwrite(fidw, w, precision); % write .pcm file
fclose(fidr);
fclose(fidw);

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