Helium-speech communication

Details Helium-speech communication Helium-speech communication

1980-10-30

1982-07-27

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Underwater system

Analog speech communication

179 1SH, 179 1UW, H04B 1100

Patent

active

043421040

ABSTRACT:
The invention relates to a novel helium-speech unscrambler which can be located at a diver's location, and enables the helium-speech voiced by the diver to be subjected to waveform time expansion to reduce the bandwidth of the helium speech (e.g. to 2 to 3 KHZ) prior to transmitting the speech signals to a distant location on a carrier wave selected for optimum transmission through the water.

REFERENCES:
patent: 3813687 (1974-05-01), Geil
patent: 3950617 (1976-04-01), Dildy, Jr.
patent: 3965298 (1976-06-01), Carlson
Electronics Letters, vol. 15, No. 18, Aug. 1979, pp. 548-550.

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