How can represent a recorded speech signal(.wav format) as a binary matrix?

A audio(in wav format) is read to variable 'p' using wavread().The sample values p contain vary between -1 and +1.what i exactly need is a binary row matrix which represent that wav file as 0's and 1's.

And how can i convert that binary row matrix back to the same audio?

Answer 1

[Walter Roberson]

[data, fs] = wavread(FileName, 'native');

Now your data is probably integers or convertible to integers. After that you use dec2bin() and transpose and reshape.

[ANJANA KRISHNAN A]

thanks for your answer.... But still i'm confused.can you give me the code for a reference?

[Walter Roberson]

[data, fs] = waveread(FileName, 'native');

row = reshape( (dec2bin(data, 8) - '0').', 1, [] )

To recover,

recovered = bin2dec( char( reshape(row, 8, []).' + '0' ) );

I did not attempt to account for the possibility that there are multiple channels in the data

[ANJANA KRISHNAN A]

the second line of the code gave me an error message :

Error using dec2bin Too many input arguments.

how can i resolve it?

[Walter Roberson]

You fix your corrupted version of MATLAB, as explained in your other question on this topic.

[ANJANA KRISHNAN A]

I fixed it.

And I tried the code you provided.but it gives the error message:

Error using dec2bin (line 33)

D must be a non-negative integer smaller than 2^52.

[Walter Roberson]

After you do the wavread(), please show

class(data)

[Walter Roberson]

If class(data) shows up as "single" or "double" or "uint64", then,

data8 = typecast(data, 'uint8');
row = reshape( (dec2bin(data8, 8) - '0').', 1, [] );

and restoring,

recovered8 = uint8( bin2dec( char( reshape(row, 8, []).' + '0' ) ) );
recovered = typecast(recovered8, class(data));

[ANJANA KRISHNAN A]

class(data) shows up as: "int16"

[Walter Roberson]

If class(data) shows up as int16 rather than uint16, then

data_u16 = typecast(data, 'uint16');
row = reshape( (dec2bin(data_u16, 16) - '0').', 1, [] );

[ANJANA KRISHNAN A]

restoring original values :

 recovered16 = uint16( bin2dec( char( reshape(row, 16, []).' + '0' ) ) );
 recovered = typecast(recovered16, class(data));