Specifications

EAW Smaart 6 Operation Manual Analysis Modes and Display Types
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3.1.2 Spectrograph
The Smaart 6 Spectrograph is a second type of RTA display that shows an input signal’s
frequency content over some period of time. Instead of showing just one FFT measure-
ment at a time (whether averaged or instantaneous) like the RTA display, the live Spec-
trograph displays a record of the most recent 100 or more RTA updates.
Figure 3-3 Spectrograph display
The Spectrograph display is a variation of a real-time spectrum analyzer (RTA). A
standard RTA indicates magnitude values for each fractional octave frequency band by
vertical bars of varying height; a new bar graph replaces the previous one each time the
display is updated. The Spectrograph plots each RTA data update as a horizontal stripe,
with signal strength at each frequency represented by different colors. Stacking a number
of these slices one above the next displays the input signal’s spectral changes over time.
The Spectrograph display shows three dimensions of data:
• time: on the x-axis
• frequency: on the y-axis
• magnitude: represented by color
The colors mapped to magnitude values are determined by the Spectrograph dB Range
Max and Min fields in the Spectrum tab of the Options dialog. Out of range values above
the current magnitude range specified for the Spectrograph are indicated on the plot in
white. Magnitude values below the current magnitude range are indicated in black.