Communications: electrical – External condition vehicle-mounted indicator or alarm – Highway information
Patent
1993-11-12
1995-11-07
Crosland, Donnie L.
Communications: electrical
External condition vehicle-mounted indicator or alarm
Highway information
340990, 340995, 364437, 36442402, 455 542, 4551861, G08G 109, G06F 1548
Patent
active
054650887
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns a traffic broadcast receiver with a first memory for allocating received addresses to segments of a street system, and with a device for reproducing the received coded signals in clearly understandable form.
Traffic broadcast receivers of this kind have been disclosed, for example, by German Patent Applications DE 38 10 179 A1 and DE 38 10 180 A1. These traffic broadcast receivers are suitable for receiving standardized coded traffic messages; the coded traffic message contains an address for a location, in particular a segment of a street system, to which the traffic message is applicable. Provided in the receiver is a first memory that contains a correlation between the coded address and the names of the segments, which are visually reproduced in clear text in a reproduction device. Further memories can be provided, with which addresses for data or events can be allocated to those data or events in a form reproducible in clear text.
German Patent Application DE 37 54 516 A1 further discloses a method for route-selective reproduction of traffic messages which makes it possible to output only those traffic messages that lie on a specific route of travel. The prerequisite for this is that the route of travel, with all its route sections, be entered into the corresponding unit. All segments of the route must therefore be previously known in enterable form. The operating complexity for this method is therefore considerable.
The underlying object of the present invention is to apply a traffic broadcast receiver of the aforesaid type for an additional purpose.
SUMMARY OF THE INVENTION
To achieve this object, a traffic broadcast receiver of the aforesaid type is provided with an additional device including a second memory for travel parameters of the segments stored in the first memory, and addresses for segments adjacent to the respective segment, an input device for at least one destination input which is to be allocated to a stored segment, a computer to determine the optimum route to the destination, and a third memory in which the segments belonging to the optimum route determined by the computer can be stored.
The present invention is based on the recognition that traffic broadcast receivers of the known type must necessarily contain a table of the segments of the street system, specifically in a form reproducible in clear text. With the additional device according to the present invention, additional information about the segments already stored in the traffic broadcast receiver is available for these segments, specifically at least one travel parameter for each segment and the linkage of the segments to one another. With this additional information the traffic broadcast receiver can be used for route finding, since the desired destination can be entered in a form that is to be allocated in the stored segment, and the additional unit has a computer that determines, from the available information about the linkage of the segments to one another, a route optimized with respect to the travel parameters that have been entered, in particular the length of the segments. One possible optimization algorithm is, for example, the Ford-Moore algorithm.
In a preferred embodiment, the additional device can be configured in the form of an IC card that can be inserted into and removed from the traffic broadcast receiver. In this form it is possible to reproduce the clear text for the segments in a language suitable for the user, even when a route system in a country with a different language is involved. With an IC card of this kind it is also possible to give the traffic broadcast receiver access to a route system that has not previously been stored in the traffic broadcast receiver, so that corresponding allocations of traffic messages to segments of that route system can be made.
Route finding with the traffic broadcast unit with additional device according to the present invention requires recognition of a starting point and entry of a destination. The starting point can, if applica
REFERENCES:
patent: 5020143 (1991-05-01), Duckeck et al.
patent: 5173691 (1992-12-01), Summer
patent: 5193214 (1993-03-01), Matdus et al.
patent: 5257023 (1993-10-01), Furuya
patent: 5313200 (1994-05-01), Sone
Crosland Donnie L.
Robert & Bosch GmbH
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