Intro 8.1. Manipulation of pitch

To modify the pitch contour of an existing Sound object, you select this Sound and click To Manipulation. A Manipulation object will then appear in the list. You can then click View & Edit to raise a ManipulationEditor, which will show the pitch contour (PitchTier) as a series of thick dots. To reduce the number of dots, choose Stylize pitch (2 st) from the Pitch menu; it will then be easy to drag the dots about the time-pitch area.

If you click any of the rectangles (or choose any of the Play commands from the View menu), you will hear the modified sound. By shift-clicking, you will hear the original sound.

To get the modified sound as a separate object, choose Publish resynthesis from the File menu.

If you modify the duration curve as well (see Intro 8.2. Manipulation of duration), the modified sound will be based on the modified pitch and duration.

Cloning a pitch contour

To use the pitch contour of one Manipulation object as the pitch contour of another Manipulation object, you first choose Extract pitch tier for the first Manipulation object, then select the resulting PitchTier object together with the other Manipulation object (e.g. by a click on the PitchTier and a Command-click on the Manipulation), and choose Replace pitch tier.

Precise manipulation of pitch

If you know exactly what pitch contour you want, you can create an empty PitchTier with Create PitchTier... from the New menu, then add points with PitchTier: Add point....

For instance, suppose you want to have a pitch that falls from 350 to 150 Hz in one second. You create the PitchTier, then add a point at 0 seconds and a frequency of 350 Hz, and a point at 1 second with a frequency of 150 Hz. You can put this PitchTier into a Manipulation object in the way described above.

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© ppgb, January 28, 2011