I've been reading a little bit about how DCT works in image compression using the 2D transform, however I don't know how this applies to audio using a 1D transform.
Suppose I have an audio segment, I mean, some samples of a mono audio vector.
Ai = [-0.0288,-0.0304,-0.0354,-0.0406,-0.0469,-0.0518,-0.0647,-0.0831 ...]
And then I calculate 1D DCT on that vector.
R = dct(Ai)
The result would be something like this:
0.2143 -0.3158 -0.6354 -0.3877 0.5503 0.2330 -0.1690 0.0203
How should I interpret this result? Are the high energy coefficient the ones with a greater value?(I'm still a noob on this). Is the first value the DC coefficient? Is there a special way to read the vector (zig-zag or something)?
Any help will be appreciated, btw I'm working with matlab. Thanks