Such as for movies, or actual older robots. And then the contrast to modern voices like Alexa or Siri?
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This is typically done using a type of algorithm called a text-to-speech (TTS) system.
A TTS system takes as input written text and produces a spoken version of that text. The process typically involves several steps. First, the text is analyzed to identify the individual words and sentences. Next, a database of pre-recorded sounds is used to create a string of individual sound units that correspond to the words and sentences in the input text. These units are then stitched together to create a continuous, synthesized speech signal.
Finally, the resulting speech signal can be processed using a number of techniques to make it sound more natural and lifelike. This can include adjusting the pitch, pace, and intonation of the speech, as well as adding various types of vocal effects, such as breathiness or mouth noise.
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