There are two types of TTS voice recordings: "not enhanced" is a recording of the text without any enhancement added and "enhanced" is a recording of the same text with enhancement added. In the following sections we present sample recordings of TTS voices on the same source text. Example Multi-syllable words Comparing TTS Voices We use Rachel's voice as a model of perfect English speech in terms of timing, inflection and pauses that is, chunking, while speaking at a high speed (180 wpm). The first section has a recording of the real voice of Rachel, a teacher of English pronunciation on the Internet. This page illustrates Tuval's TTS voice enhancement feature by comparing enhanced TTS voices with an expert real voice. See below for examples of different possible speeds. The speed of the enhanced voice is adjustable for individual user preference. Without this feature, the TTS voices when played fast require a lot of effort and concentration to be understood and would have to be played at lower "boring" speeds. The voice enhancement feature allows the voice to be read fast (up to 180 wpm) and still be well-understood. It is important for learning and instruction to have the TTS voice read sufficiently fast to keep the listener's interest thereby avoiding frustration with a "boring and monotonous" voice. This page introduces Tuval's TTS voice enhancement feature which divides sentences into thought-groups - called chunking or clumping a sentence - making it easier to understand even when read at high speed. Voice Enhancement - Important for Learning
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