Surface acoustic wave apparatus

Details Surface acoustic wave apparatus Surface acoustic wave apparatus

1975-04-04

1976-07-13

Safourek, Benedict V.

Telegraphy

Systems

Alternating or pulsating current

325163, 333 30R, H04L 2712

Patent

active

039695905

ABSTRACT:
A modulating system using a surface acoustic wave device for receiving impulses and providing, as an output, shaped carrier signals for transmitting data. The preferred embodiment uses impulses of positive and negative polarities to provide minimum shift keyed modulated output signals wherein the carrier frequency is an odd one-quarter multiple of the repetition rate of the impulses.

REFERENCES:
patent: 3568102 (1971-03-01), Tseng
patent: 3633132 (1972-01-01), Hartemann
patent: 3753166 (1973-08-01), Worley et al.
patent: 3800247 (1974-03-01), Tancrell et al.
patent: 3869682 (1975-03-01), Heeks et al.

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