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Table 3 Vibration frequencies and their meanings

From: User-centered design of a depth data based obstacle detection and avoidance system for the visually impaired

Vibration frequency (vibrations/s)

Distance to obstacle (m)

Implication

1–3

> 1 m

There is some space to continue walking forward

4–6

≤ 1 m

Walking forward will result in collision with an obstacle