morph: Morph sounds

In soundgen: Sound Synthesis and Acoustic Analysis

Morph sounds

Description

Takes two formulas for synthesizing two target sounds with soundgen and produces a number of intermediate forms (morphs), attempting to go from one target sound to the other in a specified number of equal steps. Normally you will want to set temperature very low; the tempEffects argument is not supported. Undefined values are set to reasonably intelligent defaults, but it is safer to specify the same parameters in both formulas. For instance, if formula1 includes "noise" and "mouth", set these parameters explicitly in formula2 as well.

Usage

morph(
  formula1,
  formula2,
  nMorphs,
  play = FALSE,
  savePath = NA,
  samplingRate = 16000
)

Arguments

formula1, formula2	lists of parameters for calling soundgen that produce the two target sounds between which morphing will occur. Character strings containing the full call to soundgen are also accepted (see examples)
nMorphs	the number of morphs to produce, including target sounds
play	if TRUE or a character referring to a valid player, the morphs will be played as they are produced
savePath	if it is the path to an existing directory, morphs will be saved there as individual .wav files (defaults to NA)
samplingRate	sampling rate of output, Hz. NB: overrides the values in formula1 and formula2

Value

A list containing two lists, ($formulas and $sounds), each of length nMorphs. For ex., the formula for the second hybrid is m$formulas[[2]], and the waveform is m$sounds[[2]]

See Also

soundgen

Examples

## Not run: 
# write two formulas or copy-paste them from soundgen_app() or presets:
playback = c(TRUE, FALSE)[1]
# [a] to barking
m = morph(formula1 = list(repeatBout = 2),
          # equivalently: formula1 = 'soundgen(repeatBout = 2)',
          formula2 = presets$Misc$Dog_bark,
          nMorphs = 5, play = playback)
 # use $formulas to access formulas for each morph, $sounds for waveforms
 # m$formulas[[4]]
 # playme(m$sounds[[3]])

# morph intonation and vowel quality
m = morph(
  'soundgen(pitch = c(300, 250, 400),
            formants = c(350, 2900, 3600, 4700))',
  'soundgen(pitch = c(300, 700, 500, 300),
            formants = c(800, 1250, 3100, 4500))',
  nMorphs = 5, play = playback
)

# from a grunt of disgust to a moan of pleasure
m = morph(
  formula1 = 'soundgen(sylLen = 180, pitch = c(160, 160, 120), rolloff = -12,
    nonlinBalance = 70, subDep = 15, jitterDep = 2,
    formants = c(550, 1200, 2100, 4300, 4700, 6500, 7300),
    noise = data.frame(time = c(0, 180, 270), value = c(-20, -20, -30)),
    rolloffNoise = 0)',
  formula2 = 'soundgen(sylLen = 320, pitch = c(340, 330, 300),
    rolloff = c(-18, -16, -30), ampl = c(0, -10), formants = c(950, 1700, 3700),
    noise = data.frame(time = c(0, 300, 440), value = c(-25, -15, -35)),
    mouth = c(.4, .5), rolloffNoise = -5, attackLen = 30)',
  nMorphs = 8, play = playback
)

# from scream_010 to moan_515b
# (see online demos at http://cogsci.se/soundgen/humans/humans.html)
m = morph(
  formula1 = "soundgen(
    sylLen = 490,
    pitch = list(time = c(0, 80, 250, 370, 490),
    value = c(1000, 2900, 3200, 2900, 1000)),
    rolloff = c(-5, 0, -25), rolloffKHz = 0,
    temperature = 0.001,
    jitterDep = c(.5, 1, 0), shimmerDep = c(5, 15, 0),
    formants = c(1100, 2300, 3100, 4000, 5300, 6200),
    mouth = c(.3, .5, .6, .5, .3))",
  formula2 = "soundgen(sylLen = 520,
    pitch = c(300, 310, 300),
    ampl = c(0, -30),
    temperature = 0.001, rolloff = c(-18, -25),
    jitterDep = .05, shimmerDep = 2,
    formants = list(f1 = c(700, 900),
      f2 = c(1600, 1400),
      f3 = c(3600, 3500), f4 = c(4300, 4200)),
    mouth = c(.5, .3),
    noise = data.frame(time = c(0, 400, 660),
                       value = c(-40, -20, -70)),
    rolloffNoise = c(-5, -15))",
 nMorphs = 5, play = playback
)

## End(Not run)

soundgen documentation built on Sept. 20, 2026, 5:07 p.m.