Patent ID: 7783424
Filing Date: 2010-08-24
Classification: G01C

Abstract:
1. A navigation system having a function of branch road guidance based on a running road, the system comprising: a global positioning system (GPS) module for measuring and outputting a self position; a map database (DB) for storing map data comprising road information having a road guide code on a per-road basis and an exit code between adjacent roads in a divergence point of a branch road; a storage unit for, under a predetermined control, storing road guide codes and exit codes for the running road and the branch road, and storing road guidance voice data, voice data on the branch road, and numeric voice data; a voice processor for, under a predetermined control, receiving and combining the road guidance voice data, voice data on the road guide code, and the numeric voice data, generating branch road guidance voice data, synthesizing the branch road guidance voice data by voice, and outputting a branch road guide voice; and a controller for, upon detection of the branch road from a front road on a path at the time of path guidance, reading the road guide codes for the current running road of the measured position and the branch road, storing the read road guide codes in the storage unit, and outputting the voice data on the road guide code and the exit code, the numeric voice data, and the road guidance voice data, wherein the exit code is calculated with reference to the exit angle between the running road and the branch road at the divergence point of the map DB, wherein the storage unit additionally stores voice data for outputting, by voice, a branch road guide distance point and a branch road guide distance on a per-predetermined distance basis, and wherein the controller measures a distance between the current position and the divergence point where divergence to the branch road is performed, and, when the measured distance is equal to the branch road guide distance point stored in the storage unit, additionally outputs voice data associated with the branch road guide distance point to the voice processor, thereby outputting the branch road guide voice comprising the distance to the branch road.