DSP Functions
Filters
14-19
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 they’re 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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