DSP Functions
The DSP Functions
16-21
Two-pole Bandpass Filter (BANDPASS FILTER)
This is essentially the opposite of a notch Þlter; it passes all partials at the center frequency, and
cut the levels of partials above or below the center frequency. The width is deÞned the same as
for the double notch Þlter.
The gain at the center frequency is 0 dB. Small values for width (a narrow bandpass) may
produce a very quiet signal unless the center frequency matches the frequency of a strong sine
wave partial. Wide bandpasses may result in a quiet signal if theyÕre centered in a region of the
sound where the partials are weak. You can easily boost these quiet signals with the parameters
on the F4 AMP page.
-80
-70
-60
-50
-40
-30
-20
-10
0
10 100 1000 10000 100000
Frequency in Hertz
Amplitude in dB
Width = 2 octaves;
center frequency
from C 4 to C 10
C 4
C 10
Bandpass Filter:
Frequency
-80
-70
-60
-50
-40
-30
-20
-10
0
10 100 1000 10000 100000
Frequency in Hertz
Amplitude in dB
Center frequency = C 6
width from .1 to 4 octaves
.1
4
Bandpass Filter:
Width in octaves
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