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Voice Processing Technologies


1. Information delivery systems, in other words, systems enabling clients to either create, browse or update various kinds of remote databases, containing personal or public information.

TTS technology makes possible the access to such databases by means of using synthesized voice as the information main delivery support, using the regular telephone.

Moreover, if ASR (Automatic Speech Recognition) is considered, the clients can also formulate the queries using their own voice.


Examples of such information delivery systems could be:

  • Spoken E-Mail Systems, enabling clients to browse their electronic mailboxes by hearing the messages they contain at the phone (wired or mobile).
  • General purpose information kiosk, i.e. information delivery systems driven by voice, enabling clients to browse collections of laws, hear current stock quotations, hear the daily weather forecast, hear departure and arrival hours at the airport, etc.
  • Voice-driven banking operations, i.e. services enabling clients to consult and manage their personal account related information by means of voice, using the phone.
  • Phone shopping centers, where TTS technology can be used for prompting the clients with product ads.

2. Hardcopy readers, i.e. systems including both OCR (Optical Character Recognition) and TTS technologies capable of converting a printed text document into its spoken equivalent.

3. User-friendly computer interfaces for visually impaired persons. Such interfaces would allow impaired persons to hear the contents of document such as a WEB page. If we also consider automatic speech recognition (ASR), we can think of a complete (input/output) voice-driven computer interface.

4. Language learning systems, allowing, for instance, (foreign) users or kids to correctly learn the pronunciation of words. This could be accomplished using a TTS system in an interactive way: users type the desired word(s) in and instantly hear the synthesized equivalent. It can also be a means for learning the spelling of words, since the TTS engine will produce nonsense for such a misspelled word.

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