Sound: To Pitch (ac)...

A hidden command that creates a Pitch object from every selected Sound object.

The parameters are in the following order:

• Time step (s) (standard value: 0.0)
• Pitch floor (Hz) (standard value: 75 Hz)
• Max. number of candidates (standard value: 15)
• Very accurate (standard value: off)
• Silence threshold (standard value: 0.03)
• Voicing threshold (standard value: 0.45)
• Octave cost (standard value: 0.01 per octave)
• Octave-jump cost (standard value: 0.35)
• Voiced / unvoiced cost (standard value: 0.14)
• Pitch ceiling (Hz) (standard value: 600 Hz)

With the advent of Sound: To Pitch (filtered autocorrelation)... in 2023, this command was replaced with Sound: To Pitch (raw autocorrelation)....

Transitioning

While Sound: To Pitch (ac)... will still work in scripts, you make like to transition to Sound: To Pitch (raw autocorrelation).... Please note that the Pitch ceiling parameter was moved immediately after Pitch floor, where it fits more logically. For example, you can replace the line

To Pitch (ac): 0.0, 75, 15, “off”, 0.03, 0.45, 0.01, 0.35, 0.14, 600

with the entirely equivalent line

To Pitch (raw autocorrelation): 0.0, 75, 600, 15, “off”, 0.03, 0.45, 0.01, 0.35, 0.14

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© Paul Boersma 1996,2001–2003,2022–2024