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Tips
Sample Champion

 


[1] How can I optimize my operating system for real-time audio measurements?

You should eliminate all not strictly necessary programs running in background. In Windows 95/98 by pressing CTRL-ALT-DEL it is possible to see all running tasks (at least those installed by the user). Close all programs and windows then press C-A-D: the best thing would be to see listed only "Explorer". In Windows NT4 or Windows 2000 use the taskmanager to see all running processes and try to close all unnecessary ones. Refer to the operating system manual to avoid unnecessary tasks automatic start.

 

[2] How avoiding common errors using digital audio cards and improving sampling result?

The worst thing that can happen working with digital audio is distorsion caused by excessive input levels. For musical audio recording this is a big problem because distorsion caused by A/D saturation is usually very unpleasant.
The same problem can occur when making measurements with digital instrumentation.
The suggestion is to monitor constantly the peak level meters and adjust consequently the input level in the mixer. As a rule, the maximum peak level should be at least 6 dB above the saturation level.
Note that in some old sound cards the output section (D/A) can give some distorsion on the last bit (actually playing signals greater than 16384=2^14 in absolute value). If you notice this using Sample Champion, the solution is simple: in Settings|Level use values<50%.
Fortunately Sample Champion gives you a simple way to analyze the acoustical performance of your audio card in terms of distorsion in order to perform a fine tuning of your level settings. See the application notes concerning this kind of measurements.

 

[3] In Sample Champion the wave and the spectrum data seem to "jump" high and low. What happens?

Sample Champion has the "Y Auto Scale" option turned on (default).

Simply perform a test measure to let the program measure the maximum peak amplitude and then turn off the autoscale or, in a repeated or averaged measure cycle, turn off the option once that the result of the first measure is plotted.
When the austoscale is off, it is always possible to perform a manual autoscale by pressing the button on the left of the autoscale one.

 

This page is also available for download as PDF file

 

New configuration tips:
Most common problems (and solutions)

 

 

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