Orientation system for the blind

Problem: walking stick as an aid to the blind is in umpteenth century of its existence. Modern technology can do better.

Solution: ultrasound sonar or microwave radar in the walking stick. The signals from the radar are transformed into a combination of vibrations of the handle and clicks and whistles through the microphone. Optimal combination of acoustic signals to alert the blind person of the surroundings has to be determined experimentally and may be individualized.

Unsolved problem: cost