Acoussist: An Acoustic Assisting Tool for People with Visual Impairments to Cross Uncontrolled ...
summary
System uses vehicle-mounted portable speakers that emit 17–19 kHz ultrasonic chirps (inaudible to humans) and a smartphone app to detect oncoming cars by extracting STFT t–f sweep line traces to separate overlapping signals, measuring velocity from sweep slope and direction via TDOA with MGCC, then computing stopping distance (SSD) to decide hazard. Prototype runs on COTS speakers and phones, tested in a parking lot, handles up to four vehicles, and reports MDR 11.3% / FAR ≈10–12% with stable performance across weather and times.
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