Question

please can you give me an example for below question

using matlab to encode any PCM-based audio into MP3 format and Compare the sound quality between the two formats.

What compression ratio we can get with MP3?

Answer 1

First use the audioread function to import your .mp3 file into your workspace. (You may have to use the double function to convert it before you modulate it.) Then use the Signal Processing Toolbox modulate function, choosing the 'amdsb-tc' method to modulate it as an amplitude-modulated double sideband transmitted carrier signal. Then use the demod function with the same method to demodulate it. If you want to implement these functions yourself without using the built-in functions, the documentation goes into appropriate detail to describe the methods it uses to calculate them.

Note:

wavread() already converts the file to digital form.

There is no problem multiplying a 1024 x 1 vector by a 1 x 1 scalar.