CLIOwin 6.5 PCI User's Manual - Audiomatica Srl

10.2.3 MLS SETTINGS DIALOG
Figure 10.2
sampling
Selects the measurement sampling frequency.
size
Selects the size of the MLS sequence.
window
Selects the appropriate kind of window for analyzing time data. It is possible to select
between a rectangular, Hanning or Blackman window; the last two can be full or half
sized. NOTE: These windows are applied to the time portion to be transformed with
FFT. If the start point is near the impulse full windows will null the most important
part of the time response (due to their rise time). To evaluate the effetcs of a data
window refer also to Chapter 9, and FFT measurements in general.
stimuli
Selects the kind of stimulus used for the measurement of the impulse response.
averages
Controls the averaging mode of operation. The measurement will be repeated and
averaged the number of times set, therefore obtaining a better signal-to-noise ratio
at the expense of reduced measurement speed. Continuous performs the number
of averages in the shortest time without waiting. Manual waits the user to press any
key between each measure; it is useful, for example, in averaging different
microphone positions.
phase & group delay
Used to select how phase (group delay) response is obtained.
Normal displays the measured phase (group delay) curve referring to the selected
time domain data.
Minimum calculates and displays the phase (group delay) curve, related to the
current modulus curve, in the assumption of minimum phase behaviour (i.e. the
Hilbert transform of the log magnitude).
Excess calculates and displays the phase (group delay) curve as the difference
between the Normal and the Minimum ones.
It is possible to display phase data wrapped at ±180 degrees boundaries or
unwrapped.
impedance
When taking impedance measurement refers either to the internal impedance
mode or to the ISense feature of the CLIOQC Amplifier&SwitchBox Model 2 and 3.
Chapter 10 - MLS 87