Sets the speech pitch on a designated speech channel.
- macOS 10.0+
The speech channel whose pitch you wish to set.
The new pitch for the speech channel, expressed as a fixed-point frequency value.
A result code. See Result Codes.
changes the current speech pitch on the speech channel specified
to the pitch specified by the
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. Although
fixed-point values allow you to specify a wide range of pitches,
not all synthesizers will support the full range of pitches. If
your application specifies a pitch that a synthesizer cannot handle, it
may adjust the pitch to fit within an acceptable range.