Portable system for providing voice driving directions

摘要: A travel direction speaking system that is based on a portable laptop computer. The computer determines route between an origin and destination using electronic map, prepares driving instructions the route. Each instruction includes spatial position (longitude latitude) of change in at which applies. Global Positioning System (GPS) unit provides GPS determined compares to outputs corresponding when two positions are inferred be within specified range each other. can distance or time period required from current should spoken. accounts for amount speak directions, reaction driver speed moving vehicle error associated with commercial systems. When has elapsed directions also text voice converts into signal.