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List:       mp3encoder
Subject:    Re: [mp3encoder] Psychoacoustic models and frequency response
From:       "Christofer Bustad" <tosse_bustad () hotmail ! com>
Date:       2005-08-11 19:24:04
Message-ID: BAY22-DAV1885FF9A99799D4E1BDF73FBBD0 () phx ! gbl
[Download RAW message or body]

Yes, that seems to be the case. Perhaps an approximating filter could be 
used or an adaptive filter that given a reference level chooses the correct 
frequency response...?


----- Original Message ----- 
From: "Simeon Cran" <simeoncran@acm.org>
To: "'MP3 encoders development list'" <mp3encoder@minnie.tuhs.org>
Sent: Thursday, August 11, 2005 6:18 PM
Subject: RE: [mp3encoder] Psychoacoustic models and frequency response 
oftheears


Wouldn't it depend on the level at which the user played back the file?

-----Original Message-----
From: mp3encoder-bounces@minnie.tuhs.org
[mailto:mp3encoder-bounces@minnie.tuhs.org] On Behalf Of Christofer Bustad
Sent: Thursday, August 11, 2005 6:59 AM
To: mp3encoder@minnie.tuhs.org
Subject: [mp3encoder] Psychoacoustic models and frequency response of
theears

Hi everybody!

There is one thing I've been thinking about regarding the psychoacoustic
models used in MPEG Audio. Do the models know about the equal-loudness
curves or do they assume that your ears have a flat frequency response? I
have studied both models described in the standard document (ISO/IEC
11172-3) and it seems to me that the models assume (apart from the ATH) that

the frequency response of the ears is flat. Am I correct? If so, could
putting a stuitable filter just before the psychoacoustic models improve the

sound quality?

Thanks for any responses to my thoughts!
Christofer Bustad


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