Inventors:
Andy LIAO - San Diego CA, US
Jeremy Clifford Hsu - San Diego CA, US
Daniel Scott Weinstein - San Diego CA, US
International Classification:
G01C 15/00, G06F 15/00
Abstract:
A system includes plural emitters each associated with a stylus or other entity. Each emitter is independently displaceable over an area, and emits an electromagnetic signal modulated in accordance with a distinct pattern. A single sensor is configured to detect the plural emitters. Associated signal processing determines the identity and location of each emitter. Corresponding data is communicated to a computer for traversed pathway determination, recording, writing or character recognition, or other operations.