Hello !!
While reading I am facing lot of problems . Doing reserve enginnering
without any document is
really putting in trouble . ( that is not the case in ac3 , mp3 ) .
The problems are ---->
1. How physcoacoustic model is generated . I was reading noise masking .
I have understood that FFT of 2048 samples is used for finding tone
masking .
And MDCT of same samples is used for noise masking .
Now while caluculating noise masking , logmdct input is used . And
function
bark_noise_hybridmp is called . In that function some mathematical
computation is done and
noise is calculate . ( noise[i] = R - offset )
Can anyone explain me what is the funda behind it .
<p>2. NOw about overlap and add .
I know very well how overlap add solves the aliasing problem afer IMDCT
. I have checked it
matematically .
Now here , when there is overlapping of unequal size window , ie
short - long - short . the window
shape is modified . I am clear with that ...But I am not getting the
original data after IMDCT and overlap add .
Can anyone explain me this ..?
<p><p> Thanks & reagrds
Leena
<p>--- >8 ----
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