kPreflightThenPause

Declaration

var kPreflightThenPause: Int32 { get }

Discussion

Computes speech without generating.The kPreflightThenPause flagbit is used to minimize the latency experienced when the speechsynthesizer is attempting to speak. Ordinarily, whenever a callto SpeakString, SpeakText, or SpeakBuffer ismade, the speech synthesizer must perform a certain amount of initialprocessing before speech output is heard. This startup latency canvary from a few milliseconds to several seconds depending upon whichspeech synthesizer is being used. Recognizing that larger startupdelays might be detrimental to certain applications, a mechanism existsto allow the synthesizer to perform any necessary computations at noncriticaltimes. Once the computations have been completed, the speech isable to start instantly. When the kPreflightThenPause flagbit is set, the speech synthesizer will process the input text asnecessary to the point where it is ready to begin producing speechoutput. At this point, the synthesizer will enter a paused stateand return to the caller. When the application is ready to producespeech, it should call the ContinueSpeech functionto begin speaking.