Displaying 2 results from an estimated 2 matches for "ath_bark_db".
2000 Dec 23
1
Look what I found under the Xmas tree!
...T! Now we have two; competition is a good thing. Let's
see which one is fastest :-)
Completely overhauled psycha! Well, actually, the only big change
is that it does all of its computations in the dB domain, and does
some things just a little bit different, to improve performance.
Changed the ATH_Bark_dB array. This removes some very annoying
artifacts when encoding low-frequency, tonal sounds.
MDCT_COOR: this should reduce the blocking artifacts the MDCT
creates. This #define is tunable; smaller is less correction.
The algorithm is only exact for sine windows, but is ok for the
Vorbis window as w...
2000 Nov 21
2
here's the test case, possible solution
...all,
Finally I succeeded in uploading the test case I promised.
It's at http://home.wanadoo.nl/segher/test1.wav.bz2 (It is a wav,
the headers are a bit inconsistent, but encoder_example will be
ok with it, as it just skips them).
I did some thinking, and a possible solution is decreasing the
ATH_Bark_dB[] for the lower frequencies. As the comments say,
it's not really an ATH, but this table is limiting the maximum
quantizer step (or something like that, I still don't fully
understand the psymodel). I overdid it a bit (changing everything
to zero, until the first zero in the original), and...