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The first version of SAPI was released in 1995, and was supported on Windows 95 and Windows NT 3.51.This version included low-level Direct Speech Recognition and Direct Text To Speech APIs which applications could use to directly control engines, as well as simplified 'higher-level' Voice Command and Voice Talk APIs.
The speech patterns of the SAPI 4 and SAPI 5 versions of the text-to-speech voices are different from each other. SAPI 4 voices are only available on Windows 2000 and later Windows NT-based operating systems. Redistributable versions of the SAPI 4 voices were available for download on Windows 9x operating systems, however they are no longer
However, it only allows the use of the default voice, Microsoft Sam, even if other voices have been installed. In Windows Vista and Windows 7, Narrator has been updated to use SAPI 5.3 and the Microsoft Anna voice for English. In Windows Ultimate and Windows editions for China, the Microsoft Lili voice for Mandarin Chinese is included.
Modern Windows desktop systems can use SAPI 4 and SAPI 5 components to support speech synthesis and speech recognition. SAPI 4.0 was available as an optional add-on for Windows 95 and Windows 98. Windows 2000 added Narrator, a text-to-speech utility for people who have visual impairment. Third-party programs such as JAWS for Windows, Window ...
AT&T Natural Voices: AT&T Natural Voices? 2008 Proprietary: Polly: Amazon AWS 2016 2019 Proprietary: Cepstral: Cepstral 2000 2013 Proprietary: CereProc: CereProc 2006 2017, February Proprietary: eSpeak: Jonathan Duddington 2006, February 10 2022, April 3 GPLv3+ Festival Speech Synthesis System: CSTR? 2014, December MIT-like license: FreeTTS ...
Microsoft SAPI provides a control panel for easily installing and switching between various available Text to Speech and Speech to Text engines, as well as voice training and scoring systems to improve the quality and accuracy of both engines. [9] Microsoft provided four agent characters for free, downloaded from the Microsoft Agent website.
eSpeak is a free and open-source, cross-platform, compact, software speech synthesizer.It uses a formant synthesis method, providing many languages in a relatively small file size. eSpeakNG (Next Generation) is a continuation of the original developer's project with more feedback from native speakers.
For desktop applications, other markup languages are popular, including Apple's embedded speech commands, and Microsoft's SAPI Text to speech (TTS) markup, also an XML language. It is also used to produce sounds via Azure Cognitive Services' Text to Speech API or when writing third-party skills for Google Assistant or Amazon Alexa .