Filter löschen
Filter löschen

Problem with 64 bit WAV file using audiowrite

6 Ansichten (letzte 30 Tage)
random09983492
random09983492 am 22 Jul. 2016
Kommentiert: Geoff Hayes am 23 Jul. 2016
I am using a script to generate test wav files at different sampling rates and bit depths. So far everything has worked fine up until I try to generate a 64 bit wav file. I generate the file but if I try to import the wav file in Matlab, I get an error that says "File contains uninterpretable data." The file also doesn't play in Windows Media Player. However, using the audioinfo function correctly decodes the wav header information. The script I am using is below. I am using R2015a on Windows 7 64-bit. Any ideas?
%%Generate wav file.
% Sampling rate and bit depth.
fs = 44100;
nbits = 64; %8, 16, 24, 32, 64
channels = 1;
fm = 1000; % Message frequency.
% Generate a filename
filename = strcat(num2str(fm),'_Hz_tone_fs_',num2str(fs),'_',num2str(nbits),'bits.wav');
osr = fs/fm;
decimal = osr - floor(osr);
if decimal ~= 0
cycles = round(1/decimal);
else
cycles = 100;
end
npts = cycles*osr - 1;
t = 0:1/fs:npts/fs;
m = cos(2*pi*fm*t).';
% add dummy channel to make sure c++ code works for multi-channel.
if channels > 1
m(:,2:channels) = 0;
end
%%Normalize the data based on nbits.
% Normalization ranges are from matlab's audiowrite function.
if nbits == 8
% 8 bits: uint8 ( 0 <= m(t) <= 255 )
m = uint8((m+1)/2*255);
elseif nbits == 16
% 16 bits: int16 ( -32768 <= m(t) <= 32767 )
m = int16((m+1)/2*(32767 - -32768) + -32768);
elseif nbits == 24
% 24 bits: int32 ( -2^31 <= m(t) <= 2^31-1 )
m = int32((m+1)/2*(2^31-1 - -2^31) + -2^31);
elseif nbits == 32
% 32 bits: int32 ( -2^31 <= m(t) <= 2^31-1 )
m = int32((m+1)/2*(2^31-1 - -2^31) + -2^31);
elseif nbits == 64
% 64 bits: double (-1.0 < m(t) <= 1.0 )
m = m;
else
fprintf('Invalid bit depth: %d\n',nbits);
return;
end
audiowrite(filename,m,fs,'BitsPerSample',nbits);
  1 Kommentar
Geoff Hayes
Geoff Hayes am 23 Jul. 2016
Elliot - I don't have any problems when running your above code (for R2014a on OSX 10.11.5).

Melden Sie sich an, um zu kommentieren.

Antworten (0)

Kategorien

Mehr zu MATLAB finden Sie in Help Center und File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by