1. An apparatus comprising: a first sensor for monitoring a first physical condition, resulting in data that are conveyed by a first signal; a first processor for: i) processing the data conveyed by the first signal, resulting in the first processor transitioning from a first data-processing state to a second data-processing state, wherein the transitioning of the first processor is based on a predetermined first pattern being detected by the first processor in the data conveyed by the first signal, and ii) generating a second signal, wherein the second signal is based on the transitioning of the first processor to the second data-processing state; and a second processor for processing at least a portion of the data conveyed by the first signal, according to a first power mode indicated by the second signal.