Computer graphics processing and selective visual display system – Display peripheral interface input device
Patent
1997-08-06
1999-06-22
Peng, John K.
Computer graphics processing and selective visual display system
Display peripheral interface input device
34087037, 34082571, 455 41, 455100, 345157, 345158, H04B 500, G09G 500
Patent
active
059147016
ABSTRACT:
A wireless system includes one or more transmitters and one or more remote receivers that are respectively coupled through one or more users and room ground. The transmitters each produce low-frequency, low power signals that, through capacitive coupling, pass as displacement currents into and from the body of the user, which acts as a conductive node. A receiver that couples capacitively to the user responds to the displacement currents and reproduces the signals. The transmitter includes a signal generator and a pair of electrodes. The signal generator produces modulated signals that vary the voltage between the electrodes, a first one of which is closely coupled capacitively to the user's body such that the "quasi-electrostatic" field resulting from the electrode potential causes a displacement current to pass to the user's body. The second electrode is oriented so that its coupling to the room ground is stronger than that of the first electrode, such that room ground acts as a return path for the current from the receiver. The signal generator may modulate the information to be transmitted using, for example, a pseudorandom code, to produce spread spectrum signals. This increases noise immunity and allows multiple transmitters, each using a different modulation code, to operate at the same time. The receivers each include a detector/demodulator that acquires and tracks the signals from the one or more transmitters.
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Allport David
Gersheneld Neil
Zimmerman Thomas
Lo Linus M.
Massachusetts Institute of Technology
Peng John K.
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