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A major marine park chain wanted to train their killer whales using underwater sound, in addition to the traditional hand signals. We researched marine mammal physiology, cognition, and training, and designed a "synthetic language", based in part on whale vocalization studies. We developed and installed a computer and digital signal processor-based system for delivering those cues underwater, controlled by a water-proof hand-held terminal used by trainers on stage. This new training technique was successful and the system was installed at parks in Florida, Texas, California, and Ohio.
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