![]() SAPI does not support new DDI for TTS engines to accept SSML. ![]() Indeed, this is what SAPI does when it receives SSML, so that underlying TTS engines that have been built for SAPITTS do not need to also support SSML. SSML and SAPITTS have a fairly close mapping - close enough that most SSML can be transformed into SAPITTS. In addition to SSML, SAPI 5.3 continues to support the proprietary SAPITTS markup language for annotating text for TTS rendering. SSML provides the ability to markup voice characteristics, speed, volume, pitch, emphasis, and pronunciation, so that developers can make TTS sound more natural in their applications. SAPI 5.3 supports the W3C Speech Synthesis Markup Language (SSML) version 1.0, which is defined at. For more information, see the System.Speech.* namespaces in the Windows SDK Class Library. ![]() Authors of managed applications can use this in addition to, or as an alternative to SAPI. ![]() NET namespace, System.Speech, that allows developers to speech-enable applications, especially those based on the Windows Presentation Foundation.
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