OMChroma User ManualHiérarchie de section : Predefined Classes > Wave Shaping Synthesis > Wave Shaping Synthesis with WSHP-1Wave Shaping Synthesis with WSHP-1
Tutorial WSHP-1
Name | Description | Default value |
|---|---|---|
amp | Maximum Amplitude. Linear from >0.0 to 1000 or in dB from 0 to -∞ (see Tutorial Getting Started 02 - Amplitude and Internal Editor for more details) | 500.0 |
freq | (Minimum) current frequency [Hz] | 220.0 |
atk | Attack time of the amplitude envelope [sec] | 0.085 |
dec | Decay time of the amplitude envelope [sec] | 0.64 |
The WSHP-1 Class realizes a Wave Shaping Synthesis with the following controls:
- The main amplitude,
- The fundamental frequency,
- The attack and the decay of the amplitude envelope (linear).
The example A deals with the fundamental frequency.
The example B focuses on the attack time of the amplitude envelope.
The example C focuses on the decay time of the amplitude envelope.
For the red patch C#ed and Synt see Appendix A
Inside the Class
instr 1
idur = p3
iamp = (p4 > 0.0 ? (p4*0.001*0dbfs) : (ampdbfs (p4)))
ifq = p5
iaudiofun = 1
itbloffset = 0.5 ; must be the half of the table size
ixmode = 1 ; index data mode normalized 0-1
ixferfun = 10
iatk = p6
idec = p7
if idur > (iatk+idec) igoto start ; correct atk and dec if too long
iatk = (((idur-iatk) > 0.01) ? iatk : (idur / 2.0))
idec = (((idur-iatk) > 0.01) ? (idur-iatk) : (idur / 2.0))
start:
aenv linen itbloffset-1, iatk, idur, idec ; envelope
a1 poscil aenv, ifq, iaudiofun ; sinus
a1 tablei a1 + itbloffset, ixferfun, ixmode ; transfer function
asound = a1 * iamp ; scale to amplitude
out asound
endin
