Navigation system for use with an automobile and reading unit for the system
US4502123A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 6, 1982 |
| Grant date | Feb 26, 1985 |
| Priority date | — |
| Expiry date | Jul 6, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C21/3667
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a navigation system arranged to display a road map in accordance with road map information from a cassette tape, and the present location of a motor vehicle equipped with the navigation system, a cassette tape distinguishing circuit is provided to a cassette tape player which picks up the road map information from a predetermined cassette having a window at given portion of the cassette housing. A switching circuit is responsive to the cassette tape distinguishing circuit so that the output data of the cassette tape is processed to display a given map only when a cassette carrying road map information is loaded in the cassette tape player. In the case a normal cassette carrying audio signals, such as music, is loaded the picked up audio signal is transmitted to an amplifier so that sound reproduction is effected. Thus, a single cassette player can be used in common as both a part of the navigation system and a part of a sound reproduction system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.