Extron electronics DTP CrossPoint 4K Series User Manual page 111

Filter block — The filter processor block, when first inserted, provides
one of ten filter selections; additional filters can then be added. A filter
attenuates (removes) or boosts a range of frequencies from an audio
waveform, while passing other frequencies. Click the desired filter to select
it.
NOTE: Selecting
Bass & Treble Filter
Additional filters, for a total of up to three filters, can then be added by double-clicking the
processor block. Additionally, the frequency range of each filter can be changed in the
dialog box, customized to the filter, that is accessed by double-clicking the processor block.
To add a second or third filter to the filter block, select the desired filter
in the and drop-down menus in the dialog box.
2 3
The following filters are available:
1 High Pass and Low Pass filters —
A high pass filter passes a band of frequencies extending from a
specified cutoff frequency (greater than zero) up toward the high
end of the frequency spectrum. All frequencies above the specified
cutoff frequency are allowed to pass, attenuating all frequencies
below. The default cutoff is 100 Hz.
A low pass filter passes a band of frequencies extending from a specified cutoff
frequency (less than infinite) down toward the low end of the frequency spectrum. All
frequencies below the specified cutoff frequency are allowed to pass, attenuating all
frequencies above. The default cutoff is 10 kHz.
Butterworth filters — These filters have maximally flat magnitude responses, with
•
no amplitude ripple in the passband. The Butterworth filters in the switcher have a
3-dB down point at the corner frequency.
Linkwitz-Riley filters — These filters consist of cascaded 2nd-order Butterworth
•
filters, and may be helpful when audio exhibits severe peaking. The Linkwitz-Riley
filters in the switcher have a 6-dB down point at the corner frequency.
• Bessel filters — These filters use a linear or maximally flat phase response and
a monotonically decreasing passband amplitude response to produce a constant
time-delay with all frequencies within the passband are delayed the same amount
(a near-perfect step response). The drawback is a sluggish roll-off rate compared to
Butterworth filters. The Bessel filters in the switcher have a 3-dB down point at the
corner frequency
2 Bass and treble filters — Also known as shelving or tone filters, the separate bass
and treble filters give the ability to cut or boost gain evenly above or below a given
frequency, with the end-band shape giving the visual appearance of a shelf. These filters
are typically applied to program material, and are expressed as bass and treble control.
The default bass frequency is 100 Hz and the treble default is 8 kHz.
3 Parametric equalizer filter — A parametric equalizer is a variable equalizer that
offers control of all parameters, including amplitude (boost or cut — the amount of gain
(boost) or gain reduction (cut) that is applied at a given frequency), center frequency
(frequency), and bandwidth (Q). This allows the user to control the amplitude of each
band, shift the center frequency, and widen or narrow the affected area.
4 Notch filter — These filters attenuate a narrow band of frequencies to minimize
feedback.
5 Loudness filter — Not currently functional.
DTP CrossPoint 4K Series Matrix Switchers • Matrix Software
inserts two separate filters.
1 1 1 1 1 1 1 1 1 1
2 2 2 2 2 2 2 2 2 2
3
4
5 5 5 5 5 5 5 5 5 5
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