초록 ▼

An emergency communication system used by stranded motorists to summon help when travelling on toll roads or other limited access highways. The emergency communication system comprises a portable, self-powered, hand-held transceiver set which transmits coded distress signals and directional signals,

An emergency communication system used by stranded motorists to summon help when travelling on toll roads or other limited access highways. The emergency communication system comprises a portable, self-powered, hand-held transceiver set which transmits coded distress signals and directional signals, when activated, and cycles until reception of an answer back signal. The signals or messages from the portable transceiver are transmitted at incrementally increasing power levels to a single or a plurality of roadside relay stations spaced strategically along a limited access highway or toll road. The relay stations retransmit the signals to a terminal station which has means to decode the signals and determine the location of the repeater station nearest to the stranded motorist. The terminal station also has means for displaying the location of the relay station with the information derived from the decoded signal, and means for generating an answer back signal which is transmitted via the roadside relay station to the portable handset.

대표청구항 ▼

An emergency communication system having a terminal station with a relay station identification decoder means for receiving and decoding a plurality of identification signals transmitted thereto by respective ones of a plurality of relay stations, said relay station identification signals each being

An emergency communication system having a terminal station with a relay station identification decoder means for receiving and decoding a plurality of identification signals transmitted thereto by respective ones of a plurality of relay stations, said relay station identification signals each being transmitted together with a relayed coded message from a portable transceiver, said relay station identification decoder means providing a plurality of output signals each indicative of reception of a particular relay station identification signal, and said terminal station further including display means and relay selection logic circuit means for receiving said plurality of output signals to determine the location of said portable transceiver, said relay selection logic circuit means comprising: event buffer means for storing and circulating said pluralitY of output signals; a plurality of logic circuits connected to said event buffer means for determining the location of said relay station nearest to said portable transceiver; control means operably connected to each of said logic circuits for sequentially enabling said logic circuits, one at a time, as said output signals in said event buffer means are circulated, and for generating timing control signals; and memory means operably connected to said logic circuits for storing location data obtained therefrom; said display means being responsive to said timing control signals from said control means and said location data from said memory means, thereby, displaying the location of said relay station nearest to said portable transceiver.