The “black box” approach to TTS allows for systems to be produced which satisfy the needs of a large number of customers, even if this means that solutions may be limited in the persona they present. However, even with such an approach the recording style is strictly controlled and standard scripts are augmented rather than redesigned from scratch. Limited script elements may be added to provide better coverage of the customer’s expected domain and “gilded phrases” can be included to ensure that specific phrase fragments are spoken perfectly. Such an approach allows for some “tuning” of the scripts used to create the voice. In this case, a customer pays for a TTS voice to be created using their preferred voice talent. The only alternative is to opt for a “custom voice” solution. A customer wishing to use TTS will typically choose one of these voices.
For commercially important languages many different portfolio voices may be offered all with similar speaking styles.
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Text-to-Speech has traditionally been viewed as a “black box” component, where standard “portfolio” voices are typically offered with a professional but “neutral” speaking style.