* The following table shows previous state and post state of main function.
* It can be known what precondition is and which synchronous type is.
* Please check both previous state and post state from the table carefully.
- * In case of tts_prepare() function, state doesn't be changed at once, but acynchronously.
+ * In case of tts_prepare() function, state doesn't be changed at once, but asynchronously.
* From the above state diagram, you can see dotted line as asynchronous api.
* In this case, the state changed callback is only way to know state transition as ready.
* <table>