kSpeechPitchBaseProperty

Get or set the speech channel’s baseline speech pitch.

Declaration

let kSpeechPitchBaseProperty: CFString

Discussion

The value associated with this property is a CFNumber object that specifies the speech channel’s baseline speech pitch.

Typical voice frequencies range from around 90 hertz for a low-pitched male voice to perhaps 300 hertz for a high-pitched child’s voice. These frequencies correspond to approximate pitch values in the ranges of 30.000 to 40.000 and 55.000 to 65.000, respectively.

This property works with the CopySpeechProperty(_:_:_:) and SetSpeechProperty(_:_:_:) functions.