lowres — Another resonant lowpass filter.


lowres is a resonant lowpass filter.


ares lowres asig, xcutoff, xresonance [, iskip]


iskip -- initial disposition of internal data space. A zero value will clear the space; a non-zero value will allow previous information to remain. The default value is 0.


asig -- input signal

xcutoff -- filter cutoff frequency point

xresonance -- resonance amount

lowres is a resonant lowpass filter derived from a Hans Mikelson orchestra. This implementation is much faster than implementing it in Csound language, and it allows kr lower than sr. xcutoff is not in Hz and xresonance is not in dB, so experiment for the finding best results.


Here is an example of the lowres opcode. It uses the file lowres.csd.

Example 558. Example of the lowres opcode.

See the sections Real-time Audio and Command Line Flags for more information on using command line flags.

; Select audio/midi flags here according to platform
-odac     ;;;realtime audio out
;-iadc    ;;;uncomment -iadc if realtime audio input is needed too
; For Non-realtime ouput leave only the line below:
; -o lowres.wav -W ;;; for file output any platform

sr = 44100
ksmps = 32
nchnls = 2
0dbfs  = 1

instr 1

kres = p4
asig vco .2, 220, 1		;sawtooth

kcut line 1000, p3, 10		;note: kcut is not in Hz
as   lowres asig, kcut, kres	;note: kres is not in dB
aout balance as, asig		;avoid very loud sounds
     outs aout, aout

; a sine
f 1 0 16384 10 1

i 1 0 4 3
i 1 + 4 30
i 1 + 4 60

See also

Standard Filters: Resonant Low-pass filters


Author: Gabriel Maldonado (adapted by John ffitch)

New in Csound version 3.49