[The SBLive! issue]
SBLive! has a low quality resample to 48KHz algoritm (or multirate filter
kernel too small...) maybe because to keep low latency to audio stream ...
This is the SBLive! (and not only) problem:
absolutely any audio stream is converted to 48KHz.
the worst performance is 44.1KHz audio streams (cd audio).
Audigy has the same issue except it resamples to 96000Hz but still
kernel size too small so 1% IMD at 16KHz for Audigy2 (www.tomshardware.com
my high quality resample to 48KHz (or any >= 48000, that means 96000Hz too)
component for Winamp3.
using SBLive! to resample to 48000:
You don't believe me ...???? I've included in component pack generated tones
used in my test versions of 44100Hz and 48000Hz ... Should sound the same !!!
using my component for KernelLength=16000 samples:
18KHz IMD=0.001% ; can't measure less than this
<14% on Duron 825MHz for KernelSize 16000
<5% on Duron 825MHz for KernelSize 6000
<1% on AthlonXP2000+ for KernelSize 20000
there are no known issues
<TargetSampleRate> specifies resample target frequency of filter (should be
48000 for SBLive! cards, 96000 for Audigy, and this must be the working
Samplerate of the DSP on your soundcard!!!
<KernelSize> is the multirate kernel filter length in samples of the lowpass
filter. Here are some hints for 48000&96000:
16000 samples for quality described above
6000 samples are enough for 0.1% IMD @ 19KHz and no audible IMD
(IMD is above 20khz and should be rejected by the hardware
lowpass filter of your soundcard)
altering this results:
higher KernelSize => higher quality more CPU load.
lower KernelSize => lower quality less CPU load.
don't alter this if you do not know what means this or if you do not check
the results on a spectrum analyzer!
I've used as spectrum analyzer Goldwave 4.23 and CoolEdit2000 to measure
IMD. To record result just loopback your soundcard output to Line-In and
view the result over SpectrumAnalyzer in realtime.
If you really want your SBLive/Audigy/Audigy2 to sound perfect I recommand you
to download and install KX Drivers wich you can find at: www.kxproject.com
These drivers are opensource and also freeware.
Best sound : KX Drivers + SBLive!Bugfix plugin. Try it!
email: [email protected]
P.S. Haven't you noticed that DVD movies (sampled to 48000Hz) sounded perfect
on your sound system and Audio CD's didn't????? This is why!
another advice: Use KX drivers for SBLive and Audigy and Audigy2 soundcards. You will get
professional EQ-s, filters, 5.1,6.1,7.1 Decoders, but you will need some time to understand
how to configure it
download it from www.kxproject.com