[Mp4-tech] MDCT based Psycho model

[Mody, Mihir]

Hi Srinivasan,
The psycho-acoustics models can use MDCT or FFT for analysis for given frame. It is difficult to say which one better than other. In case of FFT,  amplitude and phase of frequency carries meaning that is easy to understand. Also, lot of psychoacoustics experiments are done using tones. In case of MDCT, each this is slightly complex. There are papers on MDCT based psychoacoustics models and some implementations using MDCT. The advantage will be saving in computations as FFT computations are avoided. The cons will lesser models are available in literature in this aspect.
Regards,
Mihir
-----Original Message-----
From: mp4-tech-bounces lists.mpegif.org [mailto:mp4-tech-bounces lists.mpegif.org]On Behalf Of srinivasan soc-soft.com
Sent: Thursday, July 08, 2023 10:45 AM
To: mp4-tech lists.mpegif.org
Subject: [Mp4-tech] MDCT based Psycho model
Hi friends,
            I have some doubts in MDCT based psychoacoustic model. I have listed my doubts here.
1.      What are drawbacks if we use MDCT based psycho-model.
2.      What all things we have to take care to get proper threshold calculation.
3.      What are the details will be missing if I use MDCT instead of FFT.
  Could anyone give me a clear picture about this. 
Regards,
Srinivasan .C 
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