Resample and convert into PCM

Question

João 2019-2-7

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/443771-resample-and-convert-into-pcm

回答： João 2019-2-8

采纳的回答： João

在 MATLAB Online 中打开

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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Answer 1

João 2019-2-8

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/443771-resample-and-convert-into-pcm#answer_360182

在 MATLAB Online 中打开

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);