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Appendix D
Analysis Methods
http://groups.yahoo.com/gt-3/files/Set-up.../GTx-
Reference.gif
As can be seen, the GT-3 does affect the sound below
300Hz with a slight drop off. The only difference between
the patch and the BYPASS mode was a slight drop off in
the patch between 20-35Hz. Below 20Hz is outside of the
GT-3 specifications and therefore should be disregarded.
Level Analysis
Not all of the analysis of the GT-3 was frequency related.
The timings for the control assigns, compressor, limiter,
slicer, tremolo, pan, slow gear and signal delay/polarity
were all obtained by comparing the GT-3 output vs. the
signal output from the PC. This used to second
configuration explained above.
Steinberg's Wavelab software was used to generate the
signals sent to the GT-3, and to record and analyse the
signals returning from the GT-3.
There were two basic procedures:
1. Generate a .wav of the signal to be sent. Recording
started and then the .wav sent out (typically a 1kHz sine
wave) at 0dBFS. Both L & R channels from the GT-3
outputs were used. This method was used to analyse:
Tremolo
Pan
Slicer
Level Meters
2. Generate a .wav of the signal to be sent (again typically
a 1kHz sine wave at 0dBFS). Recording started and
then the .wav sent out. The left channel showed the
GT-3 output and the right channel contained the output
from the mixer split off directly before entering the
GT-3. This method provides an accurate comparison of
the GT-3 output vs. the original signal. This method
was used to analyse:
Compressor
Limiter
Slow Gear
Signal Delay (latency)
Signal Polarity(Phase)
Summary
Should anyone have any comments/ideas about the analysis,
ways to improve, corrections (!!! it does happen!) or more
information, particularly if they are going to repeat the
analysis, then please, please drop me an e-mail!
© Copyright 2000-2002 Barry S. Pearce et al.
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