A fully distributed, disposable, self-organizing, independently powered communications system is described capable of providing a radio-communications channel in environments that may prove dangerous or inacessible to humans and may be hostile to communications systems by exposing them to electromagnetic interference, obstacles to line-of-sight operation and threats to survival.
A hybrid of controlled access and random access schemes using frequency hopping spread spectrum communication techniques is implemented in an indoor digital data radio communication system between mobile stations and a computer system. A hop in the frequency hopping spread spectrum communication system is subdivided into two intervals so that different media-access protocols can be used in each interval. The protocol uses a centralized control scheme in one interval and a decentralized scheme in the other, and the intervals may be varied depending on the load of the system.
An inter-vehicle wireless communication and warning system (50) for a host vehicle (52) within a wireless communication network is provided. The system includes a first variable antenna (54) that receives a vehicle discovery signal and a variable amplifier (56) that is electrically coupled to the first variable antenna (54), which modifies the vehicle discovery signal. A smart transmission antenna (62) focuses and transmits a pattern signal to at least another vehicle in the wireless communication network. A smart antenna amplifier (66) is electrically coupled to the smart antenna (62) and modifies the pattern signal. A main controller (58) is electrically coupled to the variable amplifier (56), the smart antenna amplifier (66), and a vehicle network (60). The main controller (58) generates the pattern signal in response to the vehicle discovery signal and a vehicle network signal.
A robot apparatus such as an entertainment robot is configured to select a transmission destination at which a communication appliance is located, and transmits predetermined information to the selected transmission destination. The predetermined information may be a self-diagnostic result or information concerning its surrounding environment. If the transmission fails, the robot apparatus selects an alternative transmission destination whereat another communication appliance is located, and transmits the information to the alternative destination.
A disposable wireless telephone and a method of using a disposable wireless telephone capable of use for telephonic communications only for a limited period, within which limited period the sum of the durations of the telephonic communications reach the duration of the limited period, after which limited period the telephone is rendered inoperative and is discarded.
A geographically specific emergency alert system includes a code generator unit in which geographic areas to be alerted and types of severity of alerts are selected and code strings generated to represent the affected areas and alert types selected. The code strings are broadcast by modulating the audio carrier of a television signal and received on receiver units positioned in areas within the broadcast market of a television station providing the alerting service. Location codes or entered into the receiver units by the users according to the areas in which the receiver units are used. When an alert is broadcast, each receiver unit decodes a location code string in the signal. If it matches that set on the receiver, an alert code string is decoded to activate a alarm devices connected to the receiver, such as an audible alarm generator, LED, etc., in accordance with the type or severity of alert that was broadcast.
