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Designers slog on a robot voice that humans like

Voices have been added to household information "appliances" such as the home-companion robot Pepper

New York

WHEN computers speak, how human should they sound?

This was a question that a team of six IBM linguists, engineers and marketers faced in 2009, when they began designing a function that turned text into speech for Watson, the company's Jeopardy!-playing artificial...