PreSonus Quantum ES 4 handleiding
Handleiding
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8 Graphic EQ
8.2 Using the Smaart Spectrograph to Ring Out Monitors
Universal Control for StudioLive
®
Mixers
Software Reference Manual
8.1.1 Time-Frequency Spectrograph
Clicking on the Spectrograph button (from the Fat Channel EQ or GEQ tab) will launch the Time-Frequency
Spectrograph. This spectrograph provides a three-dimensional view of your audio in which x = frequency, y =
time, and color = decibel level.
Any signal below the lower dynamic-range threshold is black. Any signal above the top dynamic-range
threshold is white. Within the dynamic range, colors go from blue to green to red, with blue indicating the
quietest and red the loudest.
Many audio signals that are encountered in the field are highly dynamic. Musical signals, speech, and
even environmental noise contain significant changes in spectral content as a function of time. The
spectrograph can be thought of as a record of multiple RTA measurements taken over time, with color
representing amplitude.
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.
Universal Control provides dynamic-range sliders that set the maximum and minimum volume thresholds for
the spectrograph.
8.1.2 RTA
Clicking on the RTA button (from the Fat Channel EQ or GEQ tab) will launch a real-time analyzer in which
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, such as the one-third-octave spectrum long-term
average of a musical performance.
8.2 Using the Smaart Spectrograph to Ring Out Monitors
The spectrograph shows frequency data over time, so a constant frequency, such as feedback, results in a
straight line in the spectrograph. In a feedback loop, a portion of the signal from the speaker returns to the
microphone, resulting in a buildup of energy that creates squealing, screeching feedback. “Ringing out” is
a process of attenuating the frequencies that are feeding back to maximize gain before feedback in your
floor monitors.
1. With the mic input gain at an appropriate level, bring the aux-send level up on the mic channel you wish
to ring out.
Power User Tip: If you are using one console for stage monitors and another console for front-of-house,
set the mic input gain on the front-of-house console. Do not “gain up” the mic signal on the monitor
mixer for the sake of getting more volume out of a stage monitor, as you can do that in other places (Mix
level for individual channels, Aux Out level for global control, etc.). Gain staging is very important in
order to have a feedback-free show.
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Productinformatie
| Merk | PreSonus |
| Model | Quantum ES 4 |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 17151 MB |
