PreSonus StudioLive Remote - Manual (Page 26)

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QMix
Troubleshooting
PreSonus Universal Control 1.6,
StudioLive Remote 1.3, and QMix 1.1
2 Universal Control 1.6 with VSL
Univ
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Con
trol and VSL
2.5 VSL: Virtual StudioLive
Using this function, the spectral content of the input signal
is recorded as it changes in time. This allows you to view
and analyze time-varying trends in the input signal.
As a troubleshooting tool, the Spectrograph is useful for finding
spectral “defects” in a system or acoustical environment. Certain
audio signals or acoustical events contain specific traits that can be
easily detected due to their distinct time/frequency signature—
specifically, highly tonal sounds such as AC line noise in an electrical
signal chain or the presence of electro-acoustical feedback.
Dynamic Range
In the lower left hand corner, you will see the dynamic-range
sliders for the Spectrograph. These sliders set the maximum
and minimum volume thresholds for the Spectrograph.
RTA
Clicking on the RTA button will launch the Real-Time Analyzer
where x=frequency and y=amplitude. An RTA provides a close
visual representation of what you are hearing. It provides a view of
the long-term spectrum of the signal—for example, the one-third-
octave spectrum long-term average of a musical performance.
Averaging
While the RTA is engaged, you can adjust its averaging speed. When using
music in test measurements, it is often necessary to average the data
over a brief amount of time. This is because most musical signals do not
have energy at all frequencies all of the time.
Averaging is a mathematical process that takes multiple data
samples and performs division to acquire a statistically more
accurate calculation of the response. That’s a technical way of
saying that it slows down the “real-time” of a Real-Time Analyzer.