Method of filtering electromagnetic waves and dual channel audio

Details Method of filtering electromagnetic waves and dual channel audio Method of filtering electromagnetic waves and dual channel audio

1981-05-11

1983-07-05

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375102, 329105, H04B 1500

Patent

active

043922333

ABSTRACT:
An original electromagnetic continuous wave which is broken up into discrete lengths to form intelligence such as Morse Code, is filtered to eliminate noise, static and other electrical interference to render a weak code signal audible even in the worst receiving conditions. The original broken-up electromagnetic code wave is converted into corresponding discrete lengths of direct current voltage signals through the use of a phase-locked loop circuit. This D.C. voltage signal is then utilized to activate an audio oscillator and thereby generate a new coded or broken-up audio wave completely free of noise and other interference, which corresponds to the original wave being filtered. This new wave is audibly produced over a speaker and simultaneously therewith, the original wave before filtering is also audibly produced over a speaker through a second channel. This permits accurate tuning of the weak signal through the second channel and undistorted reproduction through the filtering channel. To enhance audibility of the reconstructed code signal from the filtered channel, the second channel receiving and audibly producing the unfiltered code signal may be provided with a muting circuit to mute the second channel during periods of reception of the code signal through the filtering channel in order to completely eliminate any background noise created by the second channel receiving and reproducing the unfiltered original code signal.

REFERENCES:
patent: 2866849 (1958-12-01), Lindridge
patent: 3322899 (1967-05-01), Renwick, Jr.
patent: 4068177 (1978-01-01), Gillis
patent: 4071829 (1978-01-01), Davis et al.

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