Portable device for vocally delivering underground route to e.g. blind person, has vocal communication device providing information via loud speaker or earphone, where sound volume of loud speaker or earphone is adjusted using potentiometer

摘要

The portable device has a route search algorithm providing routes to a user, vocal synthesis units for restoring the routes, and a liquid crystal display for displaying textual characters in large format. A vocal communication device provides information via a loud speaker or an earphone, where sound volume of the loud speaker or earphone is adjusted using a potentiometer. A memory stores the information, where the portable device is supplied by a battery and solar energy.