| Known
issues |
Sample
Champion
|
We had a problem sampling with TurlteBeach Pinnacle and
length of the input buffer equal to 16K samples (with
pure tones or custom waves, NOT MLS signal). The problem
is certainly due to a bug in the Pinnacle drivers, since it
is not present with other audio cards. Solution:
if you experience this problem, avoid that input length (use
instead 8K or 32K).
- This problem does not affect MLS measurements (impulse response)
because when a 16K MLS signal is selected, the actual input
length is 16K-1 samples.
Windows 2000
seems to be very stable and suitable for audio measurement software.
But some precautions must be taken:
- We found that W2K does not "inform" audio software
of the correct maximal sampling frequency allowable for
a specific sound card. The consequence is that, when a sampling
frequency not allowable is selected, the system could not respond
(in this case try stopping the non responding application with
Task Manager). This affects all audio software and not only
Sample Champion. Solution:
see your sound card manual to learn the maximal allowable sampling
frequency.
- Another minor problem we found concerns the audio mixer
of W2000: for some audio devices, the "Enable"-"Disable"
checkboxes are inverted.
Solution:
with Sample Champion, make some test measurements and check
the input level meters to see if the signal IN/OUT are correctly
selected.
Troubles have been noticed during the concomitant execution
of Sample Champion and other programs when a reduced disk space
(less than about 100 MB) is available. This happens because
Windows creates a swap file (Win386.swp, usually located inside
the Windows directory) for emulating the memory required by
specific programs (when not present as RAM). The disk space
required by Sample Champion (when all RAM memory is used by
other software) is about 70 MB or more, depending by settings
and opened plugins. If this free disk space is not available,
Sample Champion will not work properly and will terminate with
unexpected errors. The
symptoms are error messages such as Plugin_default not found
and other fatal errors during startup. Solution:
Leave at least 200 MB of free space on the disk where the Windows
swap file is allocated. Close any other software before
starting Sample Champion (this is always recommended).
The loop-back test with the PCMCIA
soundcard VxPocket http://www.digigram.com/
sometimes fails. Please, when using this soundcard, avoid the
loop-back connection. The Latency Time Calibration can be adjusted
placing a microphone very near to the loudspeaker cone, instead
of connecting directly the input to the output.
The USB U2A soundcard works fine with Sample Champion. Read
some additional notes here.
The Creative SBLive soundcard works internally at 48 kHz, whatever
is the user sampling frequency. For optimal measurements, use
Sample Champion only at 48 or 24 kHz with this soundcard.
|
New
configuration tips:
Most common problems (and solutions) (read
on-line)
Download Faq, Tips and Most common problems and solutions
as a single PDF 
file: click here
(745K)
Netscape
users: Shift-click to download
Explorer
users: Click right
mouse button and to select "Save"
to download
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