STKResonate — STKResonate is a noise driven formant filter.
STKResonate is a noise driven formant filter. This instrument contains a noise source, which excites a biquad resonance filter, with volume controlled by an ADSR.
asignal STKResonate ifrequency, iamplitude, [kc1, kv1[, kc2, kv2[, kc3, kv3[, kc4, kv4[, kc5, kv5]]]]]
ifrequency -- Frequency of note played, in Hertz.
iamplitude -- Amplitude of note played (range 0-1).
kc1, kv1, kc2, kv2, kc3, kv3, kc4, kv4, kc5, kv5, kc6, kv6, kc7, kv7, kc8, kv8 -- Up to 8 optional k-rate controller pairs for the STK opcodes. Each controller pair consists of a controller number (kc) followed by a controller value (kv). The 5 controller numbers and values that work for STKResonate are:
kc, kv -- 2, frequency of resonance.
kc, kv -- 4, pole radii.
kc, kv -- 11, notch frequency.
kc, kv -- 1, zero radii.
kc, kv -- 128, gain of envelope.
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The code for this opcode is taken directly from the Resonate class in the Synthesis Toolkit in C++ by Perry R. Cook and Gary P. Scavone. More on the STK classes can be found here: https://ccrma.stanford.edu/software/stk/classes.html |
Here is an example of the STKResonate opcode. It uses the file STKResonate.csd.
Example 780. Example of the STKResonate opcode.
<CsoundSynthesizer> <CsOptions> ; Select audio/midi flags here according to platform -odac ;;;RT audio out ;-iadc ;;;uncomment -iadc if RT audio input is needed too ; For Non-realtime ouput leave only the line below: ; -o STKResonate.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> sr = 44100 ksmps = 32 nchnls = 2 0dbfs = 1 instr 1 ; frequency of STKResonate has no effect on sound kpol = p4 ;pole radii kfrq line 100, p3, 0 ;resonance freq + notch freq asig STKResonate 1, 1, 2, kfrq, 4, kpol, 1, 10, 11, kfrq, 128, 127 asig = asig * .7 ;too loud outs asig, asig endin </CsInstruments> <CsScore> i 1 0 1 0 i 1 + . > i 1 + . > i 1 + . > i 1 + . 120 e </CsScore> </CsoundSynthesizer>