Polycom Vortex EF2280, Reference Manual

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LCD M
ENU
S
TRUCTURE
© Polycom, Inc. 27 V
ORTEX
EF2280 Reference Manual
P
ARAMETRIC
EQ M
ENU
The input equalizer is comprised of up to 5 bands of filtering. The whole
group of filters for the channel can also be enabled/disabled without losing
the settings for each band. For each band, you first select the type of filter
from the following: Parametric/Peaking, High Shelf, Low Shelf, Lowpass, or
Highpass.
Parametric/Peaking.
• Center Frequency: in Hz, between 20 Hz and 20,000 Hz in 1 Hz steps.
• Bandwidth: in octaves, between 0.05 and 2 octaves in 0.05 octave
steps.
• Gain: in dB, between -20 and +20 in 1 dB steps.
High Shelf.
• Center Frequency: in Hz, between 20 Hz and 20,000 Hz in 1 Hz steps.
• Bandwidth: in dB/octave, between 1 and 24 dB/octave, but is always
less than or equal to 1.2 x Gain.
• Gain: in dB between -20 and +20 in 1 dB steps.
Low Shelf.
• Center Frequency: in Hz, between 20 Hz and 20,000 Hz in 1 Hz steps.
• Bandwidth: in dB/octave, between 1 and 24 dB/octave, but is always
less than or equal to 1.2 x Gain.
• Gain: in dB between -20 and +20 in 1 dB steps.
Lowpass.
• Cutoff Frequency: in Hz, between 20 Hz and 20,000 Hz in 1 Hz steps.
Highpass.
• Cutoff Frequency: in Hz, between 20 Hz and 20,000 Hz in 1 Hz steps.
Linkwitz-Riley Low. •Frequency: in Hz, between 20 Hz and 20,000 Hz
in 1 Hz steps
• Slope between 24 dB/oct and 12 dB/oct
Linkwitz-Riley High. •Frequency: in Hz, between 20 Hz and 20,000 Hz
in 1 Hz steps
• Slope between 24 dB/oct and 12 dB/oct
Center frequency on Parametric/Peaking is the point with the most (or least)
gain. Bandwidth is the width halfway up the peak (so if the peak is 10 dB, it
is the width between the points where the gain is 5 dB).
Center frequency on shelving filters is the frequency where it crosses the
point halfway between 0 dB and the gain of the filter, halfway up the slope.
Figure 17.
EF2280
Parametric EQ sub-
menu
Parametric EQ
Frequency
Filter Type
Bandwidth
Slope
Gain
Filter Enable
Input/Output EQ
Band
Channel