Patent ID: 8665115
Filing Date: 2014-03-04
Classification: G08G,H04B

Abstract:
1. A method of conflict monitoring and error detection for an APS system, the method comprising: monitoring pedestrian signals from a traffic signal controller to determine a current traffic state; receiving and decoding an audio control signal generated for output to a speaker, the audio control signal encoded with a digital code identifying a plurality of actual parameters for an audible pedestrian signal indication; retrieving from a memory a first plurality of expected parameters for the audible pedestrian signal indication associated with the current traffic state; providing an APS malfunction management subsystem; transmitting information about the current traffic state and the plurality of actual parameters for the audible pedestrian signal indication over a powerline communications line to the APS malfunction management subsystem; retrieving from a local memory of the APS malfunction management subsystem a second plurality of expected parameters for the audible pedestrian signal indication associated with the current traffic state; comparing the plurality of actual parameters with the first plurality of expected parameters and comparing the plurality of actual parameters with the second plurality of expected parameters; and inhibiting output of the audio control signal to the speaker if one or more of the following errors are detected: