Method and apparatus for a touch sensitive system employing spread spectrum technology for the operation of one or more input devices
First Claim
1. A touch sensing system for identifying and locating one or more touch stimulating devices in a touch sensing area, including:
- a signal propagating medium for conducting signals throughout said touch sensing area;
at least one of said touch stimulating devices including means for producing a touch excitation signal and coupling said signal to said propagating medium, said touch excitation signal comprising a spread spectrum signal;
each touch excitation signal including a unique code identifying the respective device;
signal pickup means associated with said sensing area and connected to said propagating medium to receive at least one touch excitation signal from said one or more touch stimulating devices;
means for decoding said touch excitation signal to identify at least one of said touch stimulating devices;
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Accused Products
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.
130 Citations
44 Claims
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1. A touch sensing system for identifying and locating one or more touch stimulating devices in a touch sensing area, including:
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a signal propagating medium for conducting signals throughout said touch sensing area;
at least one of said touch stimulating devices including means for producing a touch excitation signal and coupling said signal to said propagating medium, said touch excitation signal comprising a spread spectrum signal;
each touch excitation signal including a unique code identifying the respective device;
signal pickup means associated with said sensing area and connected to said propagating medium to receive at least one touch excitation signal from said one or more touch stimulating devices;
means for decoding said touch excitation signal to identify at least one of said touch stimulating devices;
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 40, 41, 42, 43, 44)
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39. A touch sensing system for identifying and locating one or more touch stimulating devices in a touch sensing area, including:
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a signal propagating medium for conducting signals throughout said touch sensing area;
at least one of said touch stimulating devices including means for producing a touch excitation signal and coupling said signal to said propagating medium, said touch excitation signal comprising a spread spectrum signal;
each touch excitation signal including a unique code identifying the respective device;
signal pickup means associated with said touch sensing area and connected to said propagating medium to receive at least one touch excitation signals from said one or more touch stimulating devices;
means for decoding said touch excitation signals to identify said one or more touch stimulating devices; and
,means for determining the position of said one or more touch stimulating devices in said touch sensing area.
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Specification