hsboscil — An oscillator which takes tonality and brightness as arguments.
An oscillator which takes tonality and brightness as arguments, relative to a base frequency.
ibasfreq -- base frequency to which tonality and brighness are relative
iwfn -- function table of the waveform, usually a sine
ioctfn -- function table used for weighting the octaves, usually something like:
f1 0 1024 -19 1 0.5 270 0.5
ioctcnt (optional) -- number of octaves used for brightness blending. Must be in the range 2 to 10. Default is 3.
iphs (optional, default=0) -- initial phase of the oscillator. If iphs = -1, initialization is skipped.
kamp -- amplitude of note
ktone -- cyclic tonality parameter relative to ibasfreq in logarithmic octave, range 0 to 1, values > 1 can be used, and are internally reduced to frac(ktone).
kbrite -- brightness parameter relative to ibasfreq, achieved by weighting ioctcnt octaves. It is scaled in such a way, that a value of 0 corresponds to the orignal value of ibasfreq, 1 corresponds to one octave above ibasfreq, -2 corresponds to two octaves below ibasfreq, etc. kbrite may be fractional.
hsboscil takes tonality and brightness as arguments, relative to a base frequency (ibasfreq). Tonality is a cyclic parameter in the logarithmic octave, brightness is realized by mixing multiple weighted octaves. It is useful when tone space is understood in a concept of polar coordinates.
Making ktone a line, and kbrite a constant, produces Risset's glissando.
Oscillator table iwfn is always read interpolated. Performance time requires about ioctcnt * oscili.
Here is an example of the hsboscil opcode. It uses the file hsboscil.csd.
Example 446. Example of the hsboscil opcode.
See the sections Real-time Audio and Command Line Flags for more information on using command line flags.
<CsoundSynthesizer> <CsOptions> ; 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 hsboscil.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> sr = 44100 ksmps = 32 nchnls = 2 0dbfs = 1 ; synth waveform giwave ftgen 1, 0, 1024, 10, 1, 1, 1, 1 ; blending window giblend ftgen 2, 0, 1024, -19, 1, 0.5, 270, 0.5 instr 1 ; produces Risset's glissando. kamp = .4 kbrite = 0.3 ibasfreq = 200 ioctcnt = 5 ; Change ktone linearly from 0 to 1, ; over the period defined by p3. ktone line 0, p3, 1 asig hsboscil kamp, ktone, kbrite, ibasfreq, giwave, giblend, ioctcnt outs asig, asig endin </CsInstruments> <CsScore> i 1 0 10 e </CsScore> </CsoundSynthesizer>
Here is an example of the hsboscil opcode in a MIDI instrument. It uses the file hsboscil_midi.csd.
Example 447. Example of the hsboscil opcode in a MIDI instrument.
See the sections Real-time Audio and Command Line Flags for more information on using command line flags.
<CsoundSynthesizer> <CsOptions> ; Select audio/midi flags here according to platform ; Audio out -odac -M0 ;;;realtime audio out and realtime MIDI in ;-iadc ;;;uncomment -iadc if realtime audio input is needed too ; -o hsboscil_midi.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> sr = 44100 ksmps = 32 nchnls = 2 0dbfs = 1 ; synth waveform giwave ftgen 1, 0, 1024, 10, 1, 1, 1, 1 ; blending window giblend ftgen 2, 0, 1024, -19, 1, 0.5, 270, 0.5 instr 1 ibase = cpsoct(6) ioctcnt = 5 ; all octaves sound alike. itona octmidi ; velocity is mapped to brightness ibrite ampmidi 4 ; Map an exponential envelope for the amplitude. kenv expon .8, 1, .01 asig hsboscil kenv, itona, ibrite, ibase, giwave, giblend, ioctcnt outs asig, asig endin </CsInstruments> <CsScore> i 1 0 30 ; play for 30 seconds e </CsScore> </CsoundSynthesizer>