tonoscope

plural tonoscopes

1. Any of various devices that make sound visible by displaying vibrations.

   When the tonoscope was used with patients suffering from speech difficulties, the difference between a pure sound and a skewed sound was clearly evident.

   2010, Naomi Ozaniec, Beat Stress With Meditation: Teach Yourself, →ISBN

   2 more examples

   Seashore saw the emotions of music as buried in the subsensory rise and fall of the sound wave; only tools such as the tonoscope could capture music's true beauty.

   2014, Brenton J. Malin, Feeling Mediated: A History of Media Technology and Emotion in America, →ISBN

   Although a deaf child might not be able to hear the difference between a properly pronounced “oh” and a guttural, poorly articulated “uhh,” using the tonoscope they could see the difference!

   2016, J. Douglas Kenyon, Unseen Forces: A Guide for the Truly Attentive, →ISBN