GAINESVILLE --- A recent University of Florida computer engineering graduate student has created a program that gives a computerized voice synthesizer the unusual ability to convey human emotional states including anger, sadness and fear.
D'Arcy Truluck's program is aimed at helping speech-disabled people get across their feelings when using the synthesizer, but it also may help pave the way for computer-generated voices that one day will prove difficult to distinguish from the real thing.
"There's a lot of potential here," said Doug Dankel, an expert in artificial intelligence and UF assistant professor of computer and information science and engineering. Dankel is Truluck's faculty advisor.
Truluck, who graduated with a master's degree in computer and information science and engineering in December, created the program for her master's project. She first had to become expert in a topic that would seem to have little to do with computer engineering: how the voice expresses emotion.
"There are quite a few psychological studies that I looked at that tried to figure out what is in speech that makes you hear certain emotions," she said. Truluck, 28, found many complex vocal variables play a role, including pitch, volume, accent, vowel length and the speed at which the speaker delivers words.
Her program manipulates these and other elements in a commercially available speech synthesizer program, allowing it to project five emotional states: fear, sadness, anger, happiness and neutrality. The program is easy to use: People type in what they want to say, choose how to express it, then press a "translate" button on the screen.
The program conveys some emotions better than others, Truluck's tests showed.
Of 30 randomly selected volunteers who listened to sentences read by the
computer, nearly all identified the sad voice. Many also identified the angry
and fearful voice, but the volunt
Contact: Aaron Hoover
University of Florida