SetSpeechPitch(_:_:)
Sets the speech pitch on a designated speech channel.
Declaration
func SetSpeechPitch(_ chan: SpeechChannel, _ pitch: Fixed) -> OSErrParameters
- chan:
The speech channel whose pitch you wish to set.
- pitch:
The new pitch for the speech channel, expressed as a fixed-point frequency value.
Return Value
A resultcode. See Result Codes.
Discussion
The SetSpeechPitch functionchanges the current speech pitch on the speech channel specifiedby the chan parameterto the pitch specified by the pitch parameter.Typical voice frequencies range from around 90 hertz for a low-pitchedmale voice to perhaps 300 hertz for a high-pitched child’s voice.These frequencies correspond to approximate pitch values in theranges of 30.000 to 40.000 and 55.000 to 65.000, respectively. Althoughfixed-point values allow you to specify a wide range of pitches,not all synthesizers will support the full range of pitches. Ifyour application specifies a pitch that a synthesizer cannot handle, itmay adjust the pitch to fit within an acceptable range.