User`s manual
Table Of Contents
- CONTENTS
- 1 INTRODUCTION
- 2 THE CLIO SYSTEM
- 3 CLIO INSTALLATION
- 3.1 MINIMUM PC CONFIGURATION
- 3.2 FW-01 DRIVERS INSTALLATION UNDER WINDOWS XP
- 3.3 FW-01 DRIVERS INSTALLATION UNDER WINDOWS VISTA AND 7
- 3.4 SOFTWARE INSTALLATION
- 3.5 THE 'CLIO BOX'
- 3.6 RUNNING CLIO FOR THE FIRST TIME
- 3.7 SYSTEM CALIBRATION
- 3.8 CLIO SERIAL NUMBER AND DEMO MODE
- 3.9 TROUBLESHOOTING CLIO INSTALLATION
- 4 CLIO BASICS
- 5 SYSTEM OPERATIONS AND SETTINGS
- 6 COMMON MEASUREMENT INTERFACE
- 7 SIGNAL GENERATOR
- 8 MULTI-METER
- 9 FFT, RTA AND “LIVE” TRANSFER FUNCTION
- 10 MLS & LOG CHIRP
- 11 SINUSOIDAL
- 12 WATERFALL , DIRECTIVITY & 3D
- 12.1 INTRODUCTION
- 12.2 WATERFALL, DIRECTIVITY & 3D CONTROL PANEL
- 12.3 WATERFALL SPECIFIC CONTROLS
- 12.4 MAKING A CUMULATIVE SPECTRAL DECAY
- 12.5 DIRECTIVITY SPECIFIC CONTROLS
- 12.6 MEASURING LOUDSPEAKER SINGLE POLAR DATA (1D MODE)
- 12.7 REPRESENTING SINGLE POLAR DATA
- 12.8 3D SPECIFIC CONTROLS
- 12.9 MEASURING LOUDSPEAKER SINGLE POLAR DATA (3D MODE)
- 12.10 MEASURING FULL SPHERE LOUDSPEAKER POLAR DATA (3D MODE)
- 12.11 REPRESENTING 3D BALLOON DATA
- 12.12 EXPORT 3D BALLOON DATA
- 13 MEASURING IMPEDANCE AND T&S PARAMETERS
- 14 LINEARITY & DISTORTION
- 15 ACOUSTICAL PARAMETERS
- 16 Leq LEVEL ANALYSIS
- 17 WOW AND FLUTTER
- 18 WAVELET ANALYSIS
- BIBLIOGRAPHY
- NORMS
Stop Frequency
Selects the stop frequency for the analysis.
Number of Spectra
Selects the number of data slices to display.
Time Shift (ms)
Selects the time between two consecutive spectra.
Window Rise Time (ms)
Selects the rise time of the data selecting window. Valid only for CSD.
Energy Time Frequency (ETF)
Selects ETF mode waterfalls.
12.3.2 WATERFALL OPERATION
As already stated, the data source for a CSD or ETF waterfall is a measured impulse
response
Once you have loaded an impulse response inside the Waterfall control panel you
may easily inspect it, in the same way you also do with the MLS Impulse control
panel (see chapter 10). Of great importance is to select the start time and stop
time of the analysis: start time, the Start Window value selected in the impulse
response represents time zero for the waterfall; stop time, the Stop Window value
selected in the impulse response represents the last processed CSD slice unless a
different Time Shift has been selected.
CSD (Cumulative Spectral Decay) is intended primarily for anechoic loudspeaker
evaluation; in this case only the data between the start and stop time is analyzed;
each successive slice considers time data from its relative start time (the rearmost,
at time zero, has start time equal to the start window of MLS) to the fixed stop
time, the data being windowed by a particular time window with a smoothed rising
edge (see literature for a discussion about this). Normal values for the Window Rise
Time lie within 0.1 and 0.6ms. In CSD mode, should the Time Shift value be left at
zero, the routine will automatically calculate it, spacing the selected Number of
Spectra in the interval defined by start and stop times; if Time Shift is forced by the
user be sure to set it small enough to permit the last spectra to be calculated; if the
fixed stop time is passed, then the calculation defaults as in case of zero Time Shift.
When representing a CSD the program automatically hides the low
frequency part of the spectra that has become unreliable due to the time-
frequency uncertainty principle.
ETF (Energy Time Frequency) is intended for room acoustic evaluation; in this
case all MLS data starting from the start time are computed; then, successive slices
are calculated moving their initial point of the Time Shift value (see 12.3.1 the
Settings dialog).
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