User`s manual

102
Description of operation:
The Center Freq text box / slider controls allow the user to either type in the desired
Center Frequency of each stage directly, or to make mouse adjustments. Center Frequency
can be specified in 1 Hz steps.
The Width text box / slider controls work similarly to the Center Freq controls. The
displayed Width, however, is proportional to the Center Frequency, and will thus be
automatically changed whenever the Center Freq controls are adjusted.
The Boost/Cut controls work similarly to the Center Freq and Width controls, as the
Boost/Cut can be typed directly or selected with the slider control. The Boost/Cut
adjustment ranges from -60dB to +16dB in 1dB increments.
Warning: Pay particular attention to the Output Level and Stage Overload
indicators when positive Boost/Cut values are used, as the maximum digital signal
range for the system can easily be exceeded.
The individual Substage Active buttons allow the user to quickly switch any substage in
(LED illuminated RED) or out (LED not illuminated) of the process. These function in the
same manner as the Filter Active button, except they a
The Input Atten text box and slider control is normally set to 0dB, but can be used to
insert an attenuation of as much as 60dB in 1dB increments. This is a useful method for
quickly reducing the overall gain of the four combined parametric stages without having to
manually adjust all four Boost/Cut controls (for example, when a Stage Overload occurs),
allowing the overall shaping characteristics of the parametric filter to be retained. Type 0
in the text box to quickly restore the input attenuation to 0dB.
The Output Level bargraph, which indicates the actual parametric filter output signal
level, is provided for convenience. It functions identically to the signal bargraphs on the
Master Control Panel.
The Filter Active button allows the entire parametric filter to be switched in or out of the
process at any time. The button LED is illuminated RED when the filter is in the process,
and is not illuminated (GRAY) when the filter is out of the process. NOTE: The Filter
Active button is equivalent to, and linked with, the Active button in the associated Filter
block on the Master Control Panel.
The OK button, or the “X” button at the upper right corner of the window, is used to exit
the dialog and return to the Master Control panel.
A graphical description of a parametric filter and its controls follows in Figure 4-61.