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Ultrasonic Walk

from At The Margin of The Sensate by David Dunn

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ULTRASONIC WALK (5:28)
2009
an electroacoustic composition for two-channel playback

Several years ago, I began to experiment with designs for building ultrasonic microphones that had an omni-directional response and with techniques for translating the resultant recordings into the audible spectrum of humans. Much later I designed and constructed a binaural version of these microphones capable of preserving the interaural phase and amplitude difference of human hearing after the ultrasonic sounds are slowed and stretched through sample rate conversion into the normal human hearing range. This piece represents a simple 6-minute walk in my backyard in Santa Fe, New Mexico, while wearing the binaural ultrasonic microphones. The sounds consisted of small metal and bamboo wind chimes blowing in the wind, wild birds, the sound of my footsteps on dried leaves, and other neighborhood noises. All of the normally audible sounds were subsequently filtered out. The remaining high frequency audio component (up to 96kHz) was sample rate converted and then arranged as simultaneous segments into the original source recording duration. No other signal processing was used. Only the original inaudible sound component remains but now heard in the new time and frequency domains.

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from At The Margin of The Sensate, released April 15, 2023

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David Dunn New Mexico

David Dunn was born in 1953 in San Diego, CA. From 1970 to 1974 he was assistant to the American composer Harry Partch & remained active as a performer in the Harry Partch Ensemble for over a decade. He has worked in a wide variety of audio media inclusive of traditional & experimental music, installations for public exhibitions, video & film soundtracks, radio broadcasts, & bioacoustic research. ... more

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