Abstract: A method and apparatus for transmitting power to active touch stimulating devices associated with a touch sensing apparatus. In this invention four methods of providing power supply to the touch-input device are presented. These methods are: EM induction transmission using a single loop antenna, EM induction transmission using a conductive layer, acoustic transmission through air, and acoustic transmission through an acoustic conductive layer.

Abstract: A touch sensing apparatus for receiving input from one or more touch stimulating devices employs a spread spectrum signaling arrangement to transmit signals from the touch stimulating devices for identification and location determination. Spread spectrum techniques may include DSSS, FHSS, THSS, chirp, or combinations thereof. Passive devices operate in the propagation medium of an energy field formed of acoustic, EM, or light waves and reflect signals to signal pickups, where RSS or time delay techniques are used to determine location and spread spectrum encoding is used to identify the devices. Active devices generate a touch stimulating signal that is spread spectrum encoded for identification, and signal pickups in a propagation medium receive the touch stimulation signals which are identified by the SS encoding and located using RSS or time-delay techniques.

Abstract: A method and apparatus for transmitting power to active touch stimulating devices associated with a touch sensing apparatus. In this invention four methods of providing power supply to the touch-input device are presented. These methods are: EM induction transmission using a single loop antenna, EM induction transmission using a conductive layer, acoustic transmission through air, and acoustic transmission through an acoustic conductive layer.