WAV into binary bits

How to convert a wav file data into binary (0,1) format, so that it can again be converted from binary form to wav?

Answer 1

[Walter Roberson]

wavdata = wavread('FileName.wav');
wavbinary = dec2bin( typecast( single(wavdata(:)), 'uint8'), 8 ) - '0';
orig_size = size(wavdata);

Then the reverse:

wavdata = reshape( typecast( bin2dec( uint8(wavbinary + '0') ), 'single' ), orig_size );

[sangeeta]

the reverse says, ??? Error using ==> bin2dec Input must be a string.

[Walter Roberson]

wavdata = reshape( typecast( uint8(bin2dec( char(wavbinary + '0') )), 'single' ), orig_size );

[Jan]

Then use "char" instead of "uint8".

I do noth think, that representing bits as CHAR array is a useful idea. Therefore I avoid DEC2BIN in general, but perform the conversion arithmetically.

[Nishant Prakash]

Hi Walter can you please explain the 2nd step in short.

[Nelson Rodriguez Hernandez]

But if I have a binary array of only "Zeros and Ones"(0,1), how can I create sound from binary in .wav or other extension? Do I have to create my own samples using audiowrite, bin2dec or what? In other words how can I sampling from binary?

[Walter Roberson]

Assuming your binary array of 0 and 1 is stored in wavbinary then

data_class_to_use = 'int32';   %or as appropriate
SampleRate = 22100;      %set as appropriate

wavdata = reshape( typecast( uint8(bin2dec( char(wavbinary + '0') )), data_class_to_use ), orig_size );
audiowrite('FileNameGoesHere.wav', wavdata, SampleRate)

The data_class_to_use will depend upon kind of data you intend your binary array to represent. The sample code I gave here assumes that your binary array uses groups of 32 bits per sample, and that the 32 bits represent a signed 32 bit integer. For the question that was originally posted, it was 'float' that was appropriate to use, because the binary array represented 32 bit single precision numbers.

Answer 2

[Jan]

What exactly are "wav file data"? Are you talking about doubles or integer types?

What is the prupose of converting the data to a binary format, when you consider, that all data are store in a binary format inside the computer. What do you want to achieve?

[sangeeta]

I actually want to store audio data in an Image, that is hiding wav binary data(0,1) in pixels of an Image (Steganography), in which pixels would be selected using an algorithm.

[Kushant]

i also have the same problem...

i want to use generated c code on dsp, but matlab coder do not support wavread function. i am planning to use fopen and fread but for that i need binary files instead of .wav files.

please tell me how to do it?

and how it can be done arithmatically?

[Walter Roberson]

Outside of the dsp, wavread() the .wav files, and fwrite() them to a binary file. In the dsp read the binary file.

Answer 3

[Kyaw Yegaung]

I get the problem converting wav file to binary with wave file read command wavread. But i use another command audioread. Authoug it was work i got trouble in another command like dec2bin. It said that deceimal be less than 2 power 52. The point is what actually the data type of wav or other audio source file and how can i convert to decimal before converting binary data. If anyone could help me please contact my mail '[e-mail]'. Thank you.