| Odes�latel: Gabriel Bouvigne <[EMAIL PROTECTED]>
|
| > lame -m m -h -b32 --voice --lowpass 8 --lowpass-width 1
| > --highpass 0.054 --highpass-width 0.04 --cwlimit 7
| > --resample 22.05 --noshort a.wav a.mp3
| >
| > NOTES:
| > cwlimit=lowpass minus lowpass-width (kHz)
|
| Did you played a lot with cwlimit? Could you please share your results
about
| it?
Not as much. But if you use really high bitrates about 160 or 192kbps, then
you will get better results with higher cwlimit value , such as 11 (by
default 8.3... kHz).
If you need low bitrate, then set cwlimit as shown, because you do not need
to calculate tonality over rejected (or partially rejected) frequencies.
If you want to remove highs due low bitrate, then use empiric highpass
filter set to 0.6/lowpass (kHz), all at -10dB.
eg., 6kHz lowpass will have 0.6/6=0.1 kHz highpass.
(it is not my empiric, this is from cca 40yrs old book about acoustics)
And here LAME values:
--lowpass 6.4 --lowpass-width 1 --highpass 0.06 --highpass-width 0.1
Note that highpass values above 54Hz are very well, because they spare
first sfb that dataspace should be used for other bands.
-3dB point is at highpass munis highpass-width, or
lowpass plus lowpass-width
-10dB point you will get at (not measured,
only speculation, dont know what filters in lame works exactly)
highpass minus highpass-width/3
or
lowpass plus lowpass-witdh/3
If you dont apply highpass, then encoded output will sound with very boom
basses and speech is masked by strong bass.
Regards
Jaroslav Lukesh
--------------------------------------------------
note: (Bill) Gates to Hell!
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