RDS radio receiver with user-definable-region filtering

Details RDS radio receiver with user-definable-region filtering RDS radio receiver with user-definable-region filtering

1991-10-28

1994-09-06

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455345, 4551851, H04B 406

Patent

active

053456068

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The invention relates to a radio receiver having a decoder for decoding digitally encoded, received traffic news and program identification codes, such as the Radio Data System (RDS) codes.


BACKGROUND

German Offenlegungsschrift 3,536,820 describes a radio traffic service decoder which is set up to process digital signals. These signals are superimposed on an auxiliary carrier which is broadcast over radio transmitters together with the FM radio program. The information contained in these digital signals can consequently be transmitted without interference parallel to the actual radio program. This also applies in particular to traffic news, which can be decoded by demodulation of the aforesaid auxiliary carrier.
If the traffic news transmitted as digital signals is drafted according to the same formation principles as the traffic news broadcast in ordinary language, then it is also possible to transmit, instead of the complete information, memory addresses which call up standardized text stored in memories at the receiving end. As a consequence, it is possible to make do with a substantially smaller data capacity during the transmission. The consequence of this is that it is now possible for considerably more traffic news to be transmitted on individual events than has hitherto been the case.
While maintaining the selection criterion hitherto used for the traffic news, which is essentially oriented to the number of drivers affected, it would be possible, also with cyclical repetition, to transmit supra-regional traffic news relating to the territory of the Federal Republic of Germany, and if appropriate the neighboring countries, over all the UHF station chains. Another possibility is to limit the region to which the traffic news relates, for instance to the catchment or reception area of the station or the station chain, but then to extend the selection of traffic news also to those events which affect only a few drivers.
Regardless of the selection of transmitted traffic news made, the volume of news would overtax the attention of the driver if all the news was presented to him optically or acoustically.
It is has already been proposed that a selection be made from the traffic news displayed or represented. This can be carried out on the basis, for example, of the planned journey route which the driver has entered via an input device as data on the route to be travelled. It is then ensured that only the traffic news relating to this journey route appears on the output device.
However, the limitation to the journey route commenced can be too narrow if the driver is also interested in the traffic situation of other places or long-term situations affecting the traffic there, since he may wish to drive to these places at short notice.
If the driver is in a border area or transitional area of stations or station chains which transmit only regionally limited traffic news, then it is possible that a station is being received which, although it transmits traffic news, does not cover the region currently of interest.


SUMMARY OF THE INVENTION

The object of the invention is to improve a vehicle receiver in such a way that, regardless of a journey route commenced, traffic events happening at selected places can be selected from the set of all the traffic news transmitted and displayed, and in which it is ensured that events in these selected places are included in the traffic news.
Briefly, the user, e.g. the drive or passenger, uses an input device to predefine the geographic region of interest for the current journey. The radio memory contains a list of the transmitter Program Identification (PI) codes for each region. These selected PI codes are compared to the PI codes in the stream of news bulletins received from the RDS decoder. When the PI codes don't match, a station-seeking circuit directs the tuner to find another station. When a PI code match does not occur, the bulletin passes to the display. Thus, the user flexibly controls the filtering of bulletins.
The refinement of the

REFERENCES:
patent: 4969209 (1990-11-01), Schwob
patent: 5020143 (1991-05-01), Duckeck et al.

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