| 摘要 |
A switch assembly which activates an electrical load when it receives a triggering signal through a network coupled between a touch plate and the switch assembly. The network continuously has an incoming signal at the touch plate comprising a noise component which may be of constant or slowly changing amplitude depending upon ambient conditions at the touch plate, and which incoming signal is instantaneously changed when an individual contacts the touch plate. The network is adapted to pass such an instantaneous change in the incoming signal as a triggering signal to activate the electrical load, but to block the incoming signal when it consists only of the noise component even when the amplitude of the noise component changes slowly. The switch assembly may include timing means so that when it receives a triggering signal the electrical load is activated for a predetermined time, and when activated may transmit a signal to a remote receiver. The switch assembly is particularly useful for controlling the entryway light of a building, with the latch in a door controlling access to the entryway adapted to function as the touch plate.
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