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Kramer Electronics Ltd.
AFM-20DSP
– Processing Audio Signals
29
3. Click the Off button
. The HPF module turns on
.
Figure 26: Processing View
– HPF Module
4. Set the cut-off frequency.
5. Select the HPF low-cut algorithm type (or select
None
):
▪
Bessel
– A linear filter with maximum linear phase response. It is frequently used in
audio-crossover systems.
▪
Link R
(Linkwitz-Riley)
– An Infinite Impulse Response (IIR) filter used in audio
crossovers. It has a parallel combination of low-pass and high-pass. The filters are
usually designed by cascading two Butterworth filters, each of which has a -3dB gain
at the cut-off frequency. The resulting Link-R filter has a -6dB gain at the cut-off
frequency.
▪
Butter
(Butterworth)
–
Designed to have a frequency response as flat as possible in
the passband.
6. Select the HPF slope (
24
,
18
,
12
or
6dB/Oct
)
– Set the filter drop-off per octave from the
filter frequency.
HPF parameters are adjusted.