Patent ID: 8688180

Claim:
A system installed in a vehicle configured to detect use of a cell phone by one or more persons during operation of the vehicle comprising: an antenna for receiving RF signals from one or more cell phones when used by at least one of a driver of the vehicle, and a passenger in the vehicle; a power detector coupled to the antenna, the power detector being configured to measure received RF signals from the antenna that are above a defined minimum power threshold, the power detector outputting a voltage waveform that corresponds to the received RF signals above the defined minimum power threshold; and signal processing circuitry that receives each voltage waveform output by the power detector and analyzes each output voltage waveform to determine: received power which corresponds to the received RF signals for which the voltage waveform is output by the power detector; when the received power for a received RF signal is above a first threshold, identifying the received RF signal as a driver signal; and when the received power for the received RF signal is above a second threshold, identifying the received RF signal as a passenger signal.