Infra-red data communications system for coupling a battery powe

Details Infra-red data communications system for coupling a battery powe Infra-red data communications system for coupling a battery powe

1985-02-15

1986-12-09

Orsino, Jr., Joseph A.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

375 68, 375 96, 455608, 455617, H04B 900

Patent

active

046285415

ABSTRACT:
A battery powered keyboard entry device includes an infra-red generator for coupling the device to a microcomputer which includes an infra-red receiver. Each input binary signal is transmitted as a few (e.g. two or three) short infra-red pulses indicating the leading edge of the binary signal. In the receiver, the received groups of pulses, after detection and amplification, are stretched by a single-shot circuit to produce binary signals of substantially the same length as the original binary signals. As each transmission is substantially shorter than each binary signal, power consumption in the keyboard entry device is substantially reduced as compared with a system in which the infra-red pulses for each input signal extend over the input signal length.

REFERENCES:
patent: 2464667 (1949-03-01), Boosman et al.
patent: 3906484 (1975-09-01), Melvin, Jr. et al.
patent: 4399564 (1983-08-01), Cowen
patent: 4426662 (1984-01-01), Skerlos et al.
patent: 4514732 (1985-04-01), Hayes, Jr.

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