RE: [WM]: Asking help about Psychoacoustic Model.

[MOHAMMED CHALIL <MDCHALIL@nestec.net>]

I computed like this:

QuietThreshold = 10^(LTq(i) / 10);

for j = 1:m 
TonalComponets += ( 10^LTt(j)/10); 

for j = 1:m
NoiseComponents +=  (10^LTn(j)/10);

GlobalThreshold(i) = 10 * log(QuietThreshold + TonalComponets + NoiseComponents);

So, 

the eqn is like this : LTg[i] = 10*log(10^(LTq[i]/10)) +....

- Mohammed Chalil

-----Original Message-----
From: Benrong [mailto:brchen@ee.cuhk.edu.hk]
Sent: Tuesday, March 25, 2003 9:53 AM
To: watermarking@watermarkingworld.org
Subject: [WM]: Asking help about Psychoacoustic Model.


Dear all,

In the MPEG standard 11172-3, Coding of Moving Pictures and Associated Audio for Digital Storage Media at up to about 1.5 MBIT/S
Part 3, Audio.

ANNEX D (informative)
Psychoacoustic Model I,

While in the Step 7, Calculation of the global masking threshold LTg.

There is a equation like this:

LTg(i) = 10 log (10 LTq(i) / 10 ++);

It is said to find the global masking threshold by summing the powers corresponding to the individual masking threshold and
threshold in quiet.

But I am confused  about this equation. Is there anything wrong? Or can anybody help me to express this problem.

Thanks in advance.

Regards
Ben


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