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# sleighbells

sleighbells -- Semi-physical model of a sleighbell sound.

## Description

sleighbells is a semi-physical model of a sleighbell sound. It is one of the PhISEM percussion opcodes. PhISEM (Physically Informed Stochastic Event Modeling) is an algorithmic approach for simulating collisions of multiple independent sound producing objects.

## Syntax

ar sleighbells kamp, idettack [, inum] [, idamp] [, imaxshake] [, ifreq] [, ifreq1] [, ifreq2]

## Initialization

idettack -- period of time over which all sound is stopped

inum (optional) -- The number of beads, teeth, bells, timbrels, etc. If zero, the default value is 32.

idamp (optional) -- the damping factor, as part of this equation:

damping_amount = 0.9994 + (idamp * 0.002)

The default damping_amount is 0.9994 which means that the default value of idamp is 0. The maximum damping_amount is 1.0 (no damping). This means the maximum value for idamp is 0.03.

The recommended range for idamp is usually below 75% of the maximum value.

imaxshake (optional, default=0) -- amount of energy to add back into the system. The value should be in range 0 to 1.

ifreq (optional) -- the main resonant frequency. The default value is 2500.

ifreq1 (optional) -- the first resonant frequency. The default value is 5300.

ifreq2 (optional) -- the second resonant frequency. The default value is 6500.

## Performance

kamp -- Amplitude of output. Note: As these instruments are stochastic, this is only an approximation.

## Examples

Here is an example of the sleighbells opcode. It uses the files sleighbells.orc and sleighbells.sco.

Example 1. Example of the sleighbells opcode.

    /* sleighbells.orc */
    sr = 22050
    kr = 2205
    ksmps = 10
    nchnls = 1

    ; Instrument #1: An example of sleighbells.
    instr 1
      a1 sleighbells 20000, 0.01

      out a1
    endin
    /* sleighbells.orc */

    /* sleighbells.sco */
    i 1 0.00 0.25
    i 1 0.30 0.25
    i 1 0.60 0.25
    i 1 0.90 0.25
    i 1 1.20 0.25
    i 1 1.50 0.25
    i 1 1.80 0.25
    i 1 2.10 0.25
    i 1 2.40 0.25
    i 1 2.70 0.25
    i 1 3.00 0.25
    e
    /* sleighbells.sco */

## See Also

bamboo, dripwater, guiro, tambourine

## Credits

Author: Perry Cook, part of the PhISEM (Physically Informed Stochastic Event Modeling)
Adapted by John ffitch
University of Bath, Codemist Ltd.
Bath, UK

New in Csound version 4.07

Added notes by Rasmus Ekman on May 2002.

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