OMChroma User ManualPredefined Classes > Buzz Synthesis > Buzz Synthesis with BUZFL-1

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Buzz Synthesis with BUZFL-1

Tutorial BUZFL-1

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	Generating frequency [Hz]	263.8
freq	Filter centre frequency [Hz]	1000.0
aenv	Amplitude Envelope [GEN]	Instance: GEN07
bzl	Lowest harmonic present in the buzz [int]	Instance: GEN07
bzh	Highest harmonic present in the buzz [% of sr/2/f0. From 0.0 to 1.0]	1.0
bzm	Multiplier in the series of amplitude coefficients [flt]	0.95
bzmenv	Envelope of the buzz multiplier [GEN]	Instance: GEN07
win	Impulse response attack time [sec]	0.03
wout	Impulse response decay time [sec]	0.07

Class description

The BUZZ-1 Class realizes a Buzz Synthesis (a set of harmonically related cosine partials) plus a formant filter with the following controls:

The main amplitude,
The generating frequency,
The filter centre frequency,
The amplitude envelope by means of a GEN routine,
The lowest and the highest harmonic of the spectrum,
The components' amplitude of the spectrum,
The components' amplitude envelope by means of a GEN routine,
The impulse response attack time,
The impulse response decay time.

Patch description

The example A focuses on the values of the generating frequencies.

The example B deals with the filter centre frequency.

The example C spreads the impulse response attack time from 0.001 to 1.001 second with 0.1 time steps.

The example D spreads the impulse response decay time from 0.001 to 1.001 second with 0.1 time steps.

Common Red Patches

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

Inside the Class

Csound Orchestra of the BUZFL-1 Class.

instr 1

idur = p3

idurosc = 1/p3

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

if0 = p5

ifq = p6

iaenv = p7

inn = sr/2/if0 ; total possible number of harmonics

ihh = int (inn * p9) ; % of possible total

ilh = p8 ; lowest harmonic

ibzmul = p10

ibzmenv = p11 ; envelope for the buzz

irise = p12

idec = p13

ifn = 5 ; stored cosine function

kenv poscil iamp, idurosc, iaenv ; amp envelope

kratio poscil ibzmul, idurosc, ibzmenv ; kratio envelope

asig gbuzz kenv,if0,ihh,ilh,kratio,ifn

afil fofilter asig, ifq, irise, idec

asound balance afil, asig

out asound

endin

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