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OMChroma User ManualPredefined Classes > Formant Wave-Function Synthesis (FOF) > Formant Wave-Function Synthesis with FOF-4
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Formant Wave-Function Synthesis with FOF-4

Tutorial FOF-4

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]

5

bw

Formant bandwidth at -6dB [Hz]

0 

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

afil

Table for sineburst synthesis (size of at least 4096 recommended) [GEN01 or BPF]

32

Class description

The FOF-4 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 audio file (or table) for the sineburst synthesis.
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 gives as audio file 5 different BPF.

The example B gives as audio file the table numbers which are passed to synthesize by the keyword "tables".

Common Red Patches

For the red patches Synt, C#ed and rnd see Appendix-A.

Inside the Class

Csound Orchestra of the FOF-4 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

ifile = p13

iolaps = 100000 ; how many simultaneous FOFs can be played

; (takes little memory if not used)

imode = 0

iphs = 0

iskip = 0

isigfun = 19

; amplitude envelope

kenv poscil iamp, idurosc, iaenv

; xamp xfund xform oct kband kris kdur kdec iolaps ifna ifnb

asig fof 1.0, if0, ifreq, ioct, ibw, iwxin, iwxdur, iwxout, iolaps, ifile, isigfun, idur, iphs, imode, iskip

asound = asig*kenv

outc asound

endin

Flow chart
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