Measurement-computing eZ-PostView rev.2.0 Manual do Utilizador descarregar pdf (Página 103)

eZ-Analyst 969795 Edit Menu 4-25

Octave Band Plot from Dual Band Processing

Dual Band processing provides the following benefits:

• A wider range of octave band data with no increase in block size.

• A much wider range of data, in comparison to the data from the Single Band

mode.

• The use of buffered data means that High Band and Low Band data can be

captured simultaneously.

• When compared to Single Band, the Dual Band processing mode produces more

stable, precise data, at a lower range of frequency.

Edit Menu > Configuration > Octave Setup Tab: Filter Panel

Weighting: Used to select no filter or one of three to obtain a dB to frequency

contour that approximates that of the human ear. The contours (A,

B, and C) match human hearing at different sound intensities.

A Weighting: filters out more bass than do the B and C weights.

The A weight is used to eliminate inaudible sounds that occur at low

frequencies.

B Weighting: used to approximate the ear for medium loud

sounds.

C Weighting: used to approximate the ear at very high sound

levels.

Filter: Provides the means to select Analog Filter or Digital Filter.

Edit Menu > Configuration > Octave Setup Tab: Bar Type Panel

Line: Selecting “Line” sets the Octave Plot to appear in line format.

Solid: Selecting “Solid” sets the Octave Plot to appear filled-in solid,

as opposed to a line plot.

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Measurement-computing eZ-PostView rev.2.0 Manual do Utilizador Página 103