blob: 23ada04b9363eee6dc351aed96c0d8be2acc67d4 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
|
#N canvas 1172 268 591 353 10;
#X declare -lib cyclone;
#X text 37 24 single-pole lowpass filter;
#X text 56 272 onepole's advantages are efficiency and simplicity.
it works well as a pre- or post-processing stage for other treatments
\, such as waveshaping or filtering \, which can benefit from a gentle
roll-off of high frequencies.;
#X text 38 124 this filter is equivalent to a biquad~ object with the
coefficients \, [ a0 = k \, b1 = k - 1 ] \, as demonstrated below.
;
#X text 38 83 where k represents the cutoff frequency in radians. this
generates a single-pole lowpass filter with a 6dB/octave attenuation.
;
#X text 65 66 out = prev + k * (in - prev);
#X text 38 50 onepole~ implements the minimal filter equation:;
#X obj 427 24 import cyclone;
#X text 189 220 inlet 2: float or signal sets cutoff frequency (Hz)
;
#X obj 89 221 onepole~ 300;
#X text 187 236 argument initializes frequency;
|
