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| Number | Title | Issue Date |
| 6161092 | Presenting information using prestored speech Information (e.g. traffic information) is retrieved from a server. The content of the information is reviewed in order to determine which of a plurality of prestored speech files should be used to report the information. The selected speech files are conc... | 12/12/2000 |
| 6038509 | System for recalculating a path A typical pathfinding system provides a user with a set of directions for following a path from an origin to a destination in a network. If the user deviates from the path, the system for recalculating a path determines a new path which directs the user f... | 03/14/2000 |
| 6026384 | Cost zones A cost zone about an origin on an digital map includes the area on the map that can be traveled to, from the origin, which has a cost of travel less than a predetermined cost. The cost can be measured in distance, time of travel, ease of turning, tolls, e... | 02/15/2000 |
| 6021406 | Method for storing map data in a database using space filling curves and a method of searching the database to find objects in a given area and to find objects nearest to a location A method for storing map data in a database and a method of searching the database to find objects in a given area and to find objects nearest to a location. To generate the map data, a map plane is divided into a number of squares and the squares are num... | 02/01/2000 |
| 6016485 | System for pathfinding A system is disclosed for determining a path in a network that decreases the number of disk accesses needed during the pathfinding computation. The network is divided in to a set of tiles. Certain sub-paths are pre-computed. The pre-computed sub-paths are... | 01/18/2000 |
| 5978730 | Caching for pathfinding computation A system for computing a path in an electronic map (or other network) starts a pathfinding exploration in the background while the system is waiting for a request to find a path. The system automatically chooses an origin. The system's memory can be divid... | 11/02/1999 |
| 5948043 | Navigation system using GPS data A system for tracking an object (for example tracking an automobile as it moves over streets) using an electronic map and a GPS receiver. The GPS receiver accepts data from a number of satellites and determines a GPS derived position and velocity. Based o... | 09/07/1999 |
| 5916299 | Method for determining exits and entrances for a region in a network A system is employed for finding a path in a network between an origin in a first region and a destination in a second region. In finding this path, the system finds three paths: a path between the origin and an exit node for the first region, a path betw... | 06/29/1999 |
| 5893081 | Using multiple levels of costs for a pathfinding computation A system for computing a path in a processor readable representation of a network which can minimize an identified cost. The cost can include time, distance, tolls paid, ease of turning, quality of scenery, processing time, waiting time, etc. A user of th... | 04/06/1999 |
| 5729458 | Cost zones A cost zone about an origin on an digital map includes the area on the map that can be traveled to, from the origin, which has a cost of travel less than a predetermined cost. The cost can be measured in distance, time of travel, ease of turning, tolls; e... | 03/17/1998 |
| 5694534 | Apparatus storing a presentation of topological structures and methods of building and searching the representation A data storage medium storing a representation of a topological structure having topological features, on which is stored a digital data base including a plurality of carrier blocks of data representing the topological features t a given level of detail, ... | 12/02/1997 |
| 5546107 | Automatic chain-based conflation of digital maps The method of the present invention which employs conflation is based on pairing chains of arcs in order to determine the matching intersections between them. The chains are formed a priori in each map by using both attributes and geometric properties of ... | 08/13/1996 |
| 5311195 | Combined relative and absolute positioning method and apparatus A navigation system comprising a relative positioning system (RPS) with dead reckoning and map matching and an absolute positioning system (APS) is provided and operated in such a manner that APS position information is used for updating RPS position and ... | 05/10/1994 |
| 4811491 | Two-axis differential capacitance inclinometer A two-axis inclinometer having a central electrically conductive member inserted within and spaced from the interior walls of a non-electrically conductive vessel. A plurality of four plates are mounted symmetrically on the exterior surface of the vessel.... | 03/14/1989 |
| 4811613 | Two-axis angular rate gyroscope A two-axis angular rate gyroscopic apparatus is provided having a rotatable dish. The dish has a central hub portion and a plurality of flexible members, each of which extends from the hub portion. The entire disk is electrically conductive and connected ... | 03/14/1989 |
| 4734863 | Apparatus for generating a heading signal for a land vehicle Disclosed is an apparatus generating accurate data regarding the heading of a land vehicle as it travels over terrain having changing conditions. The apparatus includes a first sensor means, such as a differential odometer, generating data regarding the r... | 03/29/1988 |
| 4686642 | Method and apparatus for generating a stroke on a display A method and apparatus for generating a stroke on a display comprising a pair of pulse train generators coupled to a pair of charge pump and integrator assemblies by means of a switch assembly. In operation, a first pulse train corresponding to the larger... | 08/11/1987 |
| 4646015 | Flux gate sensor with improved sense winding gating A flux gate sensor having sense windings for providing an output proportional to the strength of an external magnetic field in which the sensor is placed. A gating circuit which is responsive to a pulse which is generated when the core of the sensor is dr... | 02/24/1987 |
| 4613913 | Data encoding and decoding scheme Digital data formatted on a data storage medium, in which the medium has a plurality of bit cells and the data format is such that groups of n data bits of an N-bit data word are stored over n consecutive bit cells, respectively, and a clock information b... | 09/23/1986 |
