Pulse modulated infrared data communications link

Details Pulse modulated infrared data communications link Pulse modulated infrared data communications link

1991-06-04

1993-05-25

Coles, Sr., Edward L.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359154, 359181, 375 55, 341 70, 332112, H04B 1004, H04B 1000

Patent

active

052145263

ABSTRACT:
A pulse modulated infrared data communications link including a transmitter and receiver in which the data to be sent is encoded as a biphase modulated signal having bit-cell and mid-cell transitions. Each transition is encoded as a narrow pulse in a pulse modulated signal. The pulse modulated signal is used to activate an infrared optical transmitter for generating pulsed optical signals. At a receiver, an optical detector converts pulsed optical signals into pulsed electrical signals. The pulsed electrical signals are amplified and filtered and evaluated by a comparator to generate a pulsed digital signal. The pulsed digital signal is processed by a logic circuit to generate a biphase encoded signal for transmitting on a serial data line.

REFERENCES:
patent: 3836726 (1974-09-01), Wells et al.
patent: 3899429 (1975-08-01), Ueno et al.
patent: 3905029 (1975-09-01), McIntosh
patent: 4361817 (1982-11-01), Stillwell
patent: 4573169 (1986-02-01), van Gerwen et al.
patent: 5081711 (1992-01-01), Dickman, Jr.

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