User`s manual

Y scale unit
Selects the measurement Y scale unit. Possible choices are dBV, dBu, dBRel as
Voltage, dBSPL, dBPa, dBPa/V as pressure, dBmeter as displacement, dBm/s as
velocity, dBm/s
2
as acceleration and Ohm as impedance unit. Refer to CLIO
Options>Units Conversion dialog for reference sensitivities.
smoothing
Activates a frequency smoothing of the active curve. This smoothing effect will
allow a better appreciation of the general features of the response curve. The
smoothing algorithm that is employed averages all values within a fraction-of-
octave band surrounding each analysis frequency.
10.2.3 MLS & LOG CHIRP SETTINGS DIALOG
Figure 10.2
size
Selects the size of the MLS & LOG CHIRP 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 size. 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 effects of a data window refer to Chapter 9, and FFT measurements
in general.
stimuli
Selects the kind of stimulus, either MLS and LOG CHIRP used for the
measurement.
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.
impedance
Set how Impedance is calculated and displayed. When taking impedance
10 MLS & LOG CHIRP 117