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scantable

A simpler scanned synthesis implementation.

This is an implementation of a circular string scanned using external tables. This opcode will allow direct modification and reading of values with the table opcodes.

Syntax

aout scantable kamp, kpch, ipos, imass, istiff, idamp, ivel

Initialization

ipos -- table containing position array.

imass -- table containing the mass of the string.

istiff -- table containing the stiffness of the string.

idamp -- table containing the damping factors of the string.

ivel -- table containing the velocities.

Performance

kamp -- amplitude (gain) of the string.

kpch -- the string's scanned frequency.

Examples

Here is an example of the scantable opcode. It uses the file scantable.csd.

Example of the scantable opcode.
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<CsoundSynthesizer>
<CsOptions>
; Select audio/midi flags here according to platform
-odac --limiter=0.95 ;;;realtime audio out & limiter
;-iadc    ;;;uncomment -iadc if realtime audio input is needed too
; For Non-realtime ouput leave only the line below:
; -o scantable.wav -W ;;; for file output any platform
</CsOptions>
<CsInstruments>

sr = 44100
ksmps = 32
nchnls = 2
0dbfs  = 1

; by Menno Knevel 2021

instr 1 

initial ftgen 1, 0, p5, 10, 1                         ; initial position = sine wave
imass   ftgen 2, 0, p5, -7, .1, p5, 1                 ; masses
istiff  ftgen 3, 0, p5, -7, 0, p5*.3, 0.8*p5, p5*.7, 0   ; stiffness
idamp   ftgen 4, 0, p5, -7, 1, p5, 1                  ; damping
ivelo   ftgen 5, 0, p5, -7, 0, p5, 0.5                ; initial velocity

iamp = .15
ipch  = cpsmidinn(p4) 
asig scantable iamp, ipch, 1, 2, 3, 4, 5
asig dcblock asig
asig   butlp  asig, 5000                              ; lowpass filter
outs asig, asig;

endin

</CsInstruments>
<CsScore>
s
i1      0       20      50  128
i1      10      10      70  .
i1      15      3       40  .
s
i1      0       20      50  4096    ; f-tables now bigger tables
i1      10      10      70  .       ; sounds different 
i1      15      3       40  .
s
i1      0       20      50  1000    ; still big tables
i1      10      10      70  .       ; but non-power of 2
i1      15      3       40  .
s
i1      0       20      50  20      ; small tables
i1      10      10      70  .       ; & non-power of 2
i1      15      3       40  .
e
</CsScore>
</CsoundSynthesizer>

See also

Scanned Synthesis

More information on the Scanned Synthesis opcodes: Working with Scanned Synthesis, written by Steven Yi, and some tutorials by Richard Boulanger.

Credits

Author: Matt Gilliard
April 2002

New in version 4.20