Sets the speech rate of a designated speech channel.
- macOS 10.0+
The speech channel whose rate you wish to set.
The new speech rate in words per minute, expressed as an integer value.
A result code. See Result Codes.
adjusts the speech rate on the speech channel specified by the
to the rate specified by the
As a general rule, speaking rates range from around 150 words per
minute to around 220 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.
Note: the new speech rate should be expressed as an integer (not a fixed point decimal number as the data type implies).