How to convert an audio or mp3 signal to a binary signal?

I have to read the audio signal

then covert the audio signal to the Binary SIgnal to be ready for the modulation.

How to perform the COnversion of the Audio SIgnal to Binary signal that could be domedulated in the end to give the original voice signal?

Answer 1

[Walter Roberson]

filename = 'YourFileNameGoesHere.mp3';
fid = fopen(filename, 'r');
file_bits = fread(fid, [1 inf], 'bit1=>uint8');
fclose(fid);

file_bits is now a vector of binary values ready for modulation.

At the other end, demodulate into a vector of uint8, and do any appropriate error correction. Then

filename = 'YourOutputFileNameGoesHere.mp3';
outfid = fopen(filename, 'w');
fwrite(outfid, file_bits, 'bit1');
fclose(outfid);

The other end will now have a copy of the mp3 file, which can be played through whatever mp3 player the other end has.

Note: if there was uncorrected transmission noise, then the file that is written might be corrupted in a way that makes it impossible to play. So be sure to put in enough error detection and correction for the circumstances.

[sahil sharma]

As you have used modulation here can you explain what type of modulation is being used here?

[Walter Roberson]

I did not use modulation here. It just reads the data as a bit stream.