Radio Receiver PI Code Decoding for Country Speed Limits
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Solution Overview
Problem
Drivers traveling across international borders often forget or overlook general speed limits, especially when their vehicles are not equipped with navigation systems, leading to a need for alternative methods to provide this information.
Innovation Solution
A method using a radio receiver to decode Programme Identification (PI) codes from radio signals to determine the country and output general speed limits visually or acoustically, either automatically or upon driver input, utilizing a database to associate PI codes with speed limits for different road classes and regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If general speed limits are only displayed at or close to the border, then the information is provided to drivers, but drivers may forget or overlook the information after passing the border
Solution Approach 1:
The system determines the country in advance by decoding PI codes from radio signals and retrieves the corresponding speed limit information before the driver needs it. The general speed limit for the current country is determined and stored in advance, so when the driver asks for speed limit information, it is immediately available without requiring the driver to remember it from the border.
2Loss of information
If a navigation system is installed to provide continuous speed limit information, then drivers receive ongoing speed limit updates, but the device complexity and cost increase
Solution Approach 1:
The radio receiver, which is a common device already present in most vehicles for entertainment purposes, is made multi-functional by adding the capability to decode PI codes for country determination and retrieve speed limit information. This eliminates the need for a dedicated navigation system while providing continuous speed limit information updates.
Solution Approach 2:
The system uses existing radio broadcasts that already contain PI codes transmitting country information. Instead of requiring a separate information transmission system, the vehicle's own radio receiver is utilized to extract both entertainment content and speed limit information from the same radio signals.
3Adaptability or versatility
If speed limit information is provided only through navigation systems, then continuous information is available, but vehicles without navigation systems have no means to obtain this information
Solution Approach 1:
The radio receiver is transformed into a multi-functional device that serves both entertainment purposes and provides speed limit information. This makes speed limit information accessible to all vehicles with radio receivers, eliminating dependency on expensive navigation systems while maintaining continuous information availability.
Data Source
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AI summary
The present invention relates to a method of outputting general speed limits in a vehicle, comprising receiving radio signals including Programme Identification, PI, codes at least from one radio station by means of a radio receiver installed in the vehicle, determining a country in which the vehicle is driving based on the Programme Identification, PI, codes, and determining and outputting the general speed limits that are valid in the determined country. Moreover, it is provided an apparatus installed in a vehicle, in particular, an automobile, comprising a radio receiver, configured for receiving radio signals from a radio station, the radio signals including Programme Identification, PI, codes, a processor configured for determining a country in which the vehicle is driving based on the PI codes and for determining general speed limits that are valid in the determined country and output means controlled by the processor and configured for outputting the determined general speed limits.