This process is often called text normalization, pre-processing, or tokenization. First, it converts raw text containing symbols like numbers and abbreviations into the equivalent of written-out words.

Problems listening to the file? See media help.Ī text-to-speech system (or 'engine') is composed of two parts: a front-end and a back-end.

Windows XP’s default speech synthesizer voice saying, “The quick brown fox jumps over the lazy dog 1,234,567,890 times.

Sample of Microsoft Sam ( file info) - play in browser ( beta).

Many computer operating systems have included speech synthesizers since the early 1980s. An intelligible text-to-speech program allows people with visual impairments or reading disabilities to listen to written works on a home computer. The quality of a speech synthesizer is judged by its similarity to the human voice, and by its ability to be understood.

Alternatively, a synthesizer can incorporate a model of the vocal tract and other human voice characteristics to create a completely 'synthetic' voice output. For specific usage domains, the storage of entire words or sentences allows for high-quality output.

Systems differ in the size of the stored speech units a system that stores phones or diphones provides the largest output range, but may lack clarity. Synthesized speech can be created by concatenating pieces of recorded speech that are stored in a database.

A text-to-speech (TTS) system converts normal language text into speech other systems render symbolic linguistic representations like phonetic transcriptions into speech. A computer system used for this purpose is called a speech synthesizer, and can be implemented in software or hardware. Speech synthesis is the artificial production of human speech.

Acapela voice synthesizer