Important: Inside Macintosh: Sound is deprecated as of Mac OS X v10.5. For new audio development in Mac OS X, use Core Audio. See the Audio page in the ADC Reference Library.
SetSpeechRate
You can set the speech rate of a designated speech channel with theSetSpeechRate
function.
FUNCTION SetSpeechRate (chan: SpeechChannel; rate: Fixed): OSErr;
chan
- The speech channel whose rate you wish to set.
rate
- The new speech rate for the speech channel, expressed as a fixed-point, words-per-minute value.
DESCRIPTION
TheSetSpeechRate
function adjusts the speech rate on the speech channel specified by thechan
parameter to the rate specified by therate
parameter. As a general rule, typical speaking rates range from around 150 words per minute to around 180 words per minute. It is important to keep in mind, however, that users will differ greatly in their ability to understand synthesized speech at a particular rate based upon their level of experience listening to the voice and their ability to anticipate the types of utterances they will encounter.SPECIAL CONSIDERATIONS
You can call theSetSpeechRate
function at interrupt time.ASSEMBLY-LANGUAGE INFORMATION
The trap macro and routine selector for the SetSpeechRate function are
Trap macro Selector _SoundDispatch
$0444000C RESULT CODES
noErr 0 No error invalidComponentID -3000 Speech channel is uninitialized or bad