HIGH SHELF FILTER
High shelf filters raise or lower the magnitude response at frequencies above the cut-off frequency
without altering the response at frequencies below the cut-off frequency. Since it is not realistically possible to create
a perfect filter that alters only high frequencies without affecting low frequencies, high shelf design involves
compromises that allow some rounding of the corner at the filter cut-off frequency and some slope in the transition to
the unaltered low frequencies.
Element
Default Range Description
Switches between frequency (magnitude) and phase
response (phase) indication.
Switch for selecting dB-axis scaling of 25 dB (± 12.5
dB) or 50 dB (± 25 dB).
6dB 6dB,
12dB
SLOPE sets the transition band slope of the high shelf
filter.
1000Hz 20 Hz...
20 kHz
FREQUENCY sets the cut-off frequency of the high
shelf filter.
0.0 dB -18...+18
dB
GAIN defines the amplification (increase) or
attenuation (reduction) of the high shelf filter.
BYPASS switches the filter ON (not engaged) or OFF
(engaged), which allows for quick A / B-evaluation of
the actual effect that the high shelf filter has on the
sound.
Filter Editing via ”Mouse Movement” in the Graphics Display
A white dot in the frequency response display represents an active filter (BYPASS not engaged). Clicking with the left
mouse button on this dot and keeping the mouse button pressed down allows changing the filter’s frequency by
moving the mouse to the left or to the right.
IRIS-Net
DIGITAL MATRIX | en 421
Bosch Security Systems B.V. User Manual 2017.05 | 3.20 | F.01U.119.956
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