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CLIOwin 6.5 PCI User's Manual - Audiomatica Srl

CLIOwin 6.5 PCI User's Manual - Audiomatica Srl

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12.3 WATERFALL BASICS<br />

Figure 12.2<br />

Within the waterfall settings dialog (Fig. 12.2) it is possible to configure many waterfall<br />

parameters. But, since the calculation relies on externally available data, it also<br />

captures some settings from the data source itself. When executing CSD and ETF<br />

waterfalls the data source is the MLS control panel, when displaying files the data source<br />

is, obviously, the set of files. It is possible to save and load from disk executed waterfalls.<br />

One automatic setting is Y scaling. The waterfall amplitude scale is always dB relative;<br />

the routine try to evaluate the maximum value within all the data to be represented and<br />

references all other values to this.<br />

The first setting encountered is Mode that selects between the available modes: CSD,<br />

ETF and File. Follow a basic introduction to the three different modes.<br />

12.3.1 CSD AND ETF MODES SETTINGS AND OPERATION<br />

Number of Spectra<br />

Selects the number of data slices to display.<br />

Time Shift (ms)<br />

Selects the time between two consecutive spectra.<br />

Window Rise Time (ms)<br />

Selects the rise time of the data selecting window. Valid only for CSD.<br />

Reference<br />

If checked the waterfall spectra will be reference to the rearmost one.<br />

As already said, the data source for a CSD or ETF waterfall is the MLS control panel; when<br />

in these modes, the Go button becomes active only if there is an MLS measurement<br />

active, i.e.just executed or loaded from disk. The waterfall captures the following MLS<br />

settings: frequency range, if MLS has a zoomed curve than waterfall will take the<br />

selected zoom as frequency range to display; smoothing, the current MLS smoothing<br />

factor is also applied to the calculated data slices; start time, the Start Window value<br />

selected in the MLS impulse response represents time zero for the waterfall; stop time,<br />

the Stop Window value selected in the MLS impulse response represents the last<br />

processed CSD slice unless a different Time Shift has been selected.<br />

You can interactively switch between the MLS and Waterfall control panels to change<br />

the MLS settings that affect waterfall.<br />

CSD (Cumulative Spectral Decay) is intended primarily for anechoic loudspeaker<br />

118 Chapter 12 - Waterfall

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