OMChroma User ManualPredefined Classes > Formant Wave-Function Synthesis (FOF) > Formant Wave-Function Synthesis with FOF-3

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Formant Wave-Function Synthesis with FOF-3

Tutorial FOF-3

Specific Slots

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)	-6.0
f0	Frequency of the impulses that create the sinebursts [Hz]	220.0
freq	Formant frequency [Hz]	609
bw	Formant bandwidth at -6dB [Hz]	77
aenv	Amplitude Envelope [GEN]	Instance: GEN07
win	Attack times of the sinusoid burst [sec]	0.01
wdur	Duration of the sinusoid burst [sec]	0.2
wout	Decay times of the sinusoid burst [sec]	0.1
oct	Octaviation factor of the fof [flt >=0.0]	0.0
fdev	Frequency deviation sets the end pitch of each grain relative to the initial pitch [semitones]	1.0

Class description

The FOF-3 Class realizes a Formant Wave-Function Synthesis with the following controls:

The main amplitude,
The fundamental frequency,
The formant frequency,
The bandwidth of the formant,
The amplitude envelope by means of a GEN routine,
The attack, the oveall duration and decay of the sinusoid burst,
The octaviation factor,
The frequency deviation of the end pitch of each grain.

Common parameters

For the explanation of f0, freq and bw see Tutorial FOF-1

For the explanation of win, wdur, wout and oct see Tutorial FOF-2

Patch description

The example A spreads the frequency deviation from 1 to 24 semitones with 1 semitone's steps.

Common Red Patches

For the red patch C#ed and Synt see Appendix A

Inside the Class

Csound Orchestra of the FOF-3 Class.

instr 1

idur = p3

idurosc = 1/p3

iamp = (p4 > 0.0 ? (p4*0.001*0dbfs) : (ampdbfs (p4)))

if0 = p5

ifreq = p6

ibw = p7

iaenv = p8

iwxin = p9

iwxdur = p10

iwxout = p11

ioct = p12

igls = p13/12 ; 1/12 = 1 semitone

iolaps = 100000 ; how many simultaneous FOFs can be played (takes little memory if not used)

iphs = 0

iskip = 0

iafun = 4

isigfun = 19

; amplitude envelope

kenv poscil iamp, idurosc, iaenv

asig fof2 1.0, if0, ifreq, ioct, ibw, iwxin, iwxdur, iwxout, iolaps, iafun, isigfun, idur, iphs, igls, iskip

asound = asig*kenv

outc asound

endin

Flow chart

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