kSpeechRateProperty

Get or set a speech channel’s speech rate.

Declaration

let kSpeechRateProperty: CFString

Discussion

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

The range of supported rates is not predefined by the Speech Synthesis Manager; each speech synthesizer provides its own range of speech rates. Average human speech occurs at a rate of 180 to 220 words per minute.

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