Infra-red wireless keyboard system

Details Infra-red wireless keyboard system Infra-red wireless keyboard system

1990-11-19

1993-02-23

Coles, Sr., Edward L.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359154, H04B 1000

Patent

active

051895439

ABSTRACT:
A communication system comprising a wireless keyboard for emitting infra-red signals, a receiving unit for converting the infra-red signals to an electrical signal, a tuning and amplifying circuit coupled to the receiving unit for tuning and amplifying the electrical signals, a carrier filtering circuit for removing the carrier component of the input signal, a single-shot circuit coupled to the carrier filtering circuit for converting its input signal to a known code wave form, and a microprocessor for receiving the code wave. The invention allows multiple users to operate their wireless keyboards without interference.

REFERENCES:
patent: 4628541 (1986-12-01), Beavers
patent: 4897821 (1990-01-01), Thierry et al.
patent: 4905279 (1990-02-01), Nishio
patent: 4914517 (1990-04-01), Duffield
Infoworld, Jul. 17, 1989, Darrow, B. (359/172).
Photolink.TM. RS-232, Photonics Corporation 1989. (359/172).

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