User`s manual

delay display
Shows the delay correction, in ms, that is applied while processing the two
channels.
level threshold display and control
Sets the peak level versus input full scale of the reference channel below which
the measurement is frozen. It is possible to modify the value using the dedicated
spin buttons. Setting this threshold properly lets you measure only when the
signal is present at the reference channel and avoid that inaccurate readings
accumulates with the measure distorting it.
compression factor display
Shows the difference, in dB, between the crest factors of the two input signals.
The compression factor gives you a rough indication about how much the system
under test is limited in its dynamic range. The more negative the compression
factor more the system is limiting the input signal.
9.10.2 USING CLIO DURING A LIVE PERFORMANCE
When using CLIO as a dual channel FFT analyzer for measuring a “Live” transfer
function you should follow a particular connection diagram which is depicted in
figure.
INPUT A
OUTPUT (A OR B)
CLIO
MICROPHONE
SIGNAL
SOURCE
PA OR HT
SYSTEM
INPUT B
In this case the signal source may be music or any live program material; to
monitor the system transfer function you must feed the original signal plus the
measured one to CLIO. The input channel to which you connect the original signal is
said to be the reference channel; in figure it is channel B; you will then measure
the A/B transfer function.
Before starting a live measurement choose the proper FFT settings based on your
experience; for your first tests we suggest the following:
- FFT Size: 32k or more
- Window: Hanning
- Smoothing: 1/48th Octave
- Averages: at least 10
- Level Threshold: -20dB.
9 FFT, RTA AND “LIVE” TRANSFER FUNCTION 111