Dolphins' vocalizations extend well above the human hearing range, especially when they use sound waves as a sonar. To discover all the sounds they can produce, we picked up devices capable of recording up to the ultrasonic range. Then, by slowing down the original recording during playback, one can reveal the inaudible, though at a slower speed. Still, the resulting frequencies can be very high and inaudible to you if your hearing is not perfect.Because this soundscape includes a lot of high frequencies, it would be a perfect companion to mask your tinnitus, if you suffer from it, or even to retrain your hearing if you have developed hyperacusis to certain higher frequencies.
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