:: > > The whole sfb21 thingy is a kludge, we should extend psymodel.c
:: > > to calculate maskings for that band too.
:: > >
:: > the ATH is so large in that band, I would be afraid that
:: > any computed maskings would always be < ATH, and thus
:: > not worth computing?
::
:: Wouldn't it be possible to use the ATH value as masking (as now), but use
:: this value in the masking computing? It should prevent to lower a lot the
:: overall masking for sfb21 when using something like --athlower 100. After
:: all in the others sfb when using --athlower 100 the whole masking is not
:: reduced, only the ATH. I'm afraid that now, using --athlower 100 would
:: result in an incredible ammount of bits in the latest sfb. I'll test it and
:: post the results.
::
The main problem of masking at low SPLs is that is weaker than at higher
SPLs. At 30 dB(A) low frequency and high frequency slope are nearly
identical. Masking is relative to the masking signal higher, but much faster
falling into high frequency direction.
x 90 dB(A)
___
\___ ||
\___/ \
\___ ||
\___ ||
x 55 dB(A) \___/ \
_ \___
\_ \___
\_
\_
\_
\_
x\ 40 dB(A)\_
\ \_
\ \_
--
Mit freundlichen Gr��en
Frank Klemm
eMail | [EMAIL PROTECTED] home: [EMAIL PROTECTED]
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