Underwater communication apparatus and underwater microphone, an

Details Underwater communication apparatus and underwater microphone, an Underwater communication apparatus and underwater microphone, an

1997-08-18

1998-10-20

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Underwater system

Analog speech communication

H04B 1100

Patent

active

058257187

ABSTRACT:
An underwater communication apparatus is provided which enables safe and clear speech transmission. An exhalation pipe which defines an acoustic space for communicating with an interior space of a mouthpiece is connected at one end to a site adjacent a breathing port of the mouthpiece. An exhaust valve which allows the flow of air only from the mouthpiece toward an exhaust port of the exhalation pipe is provided adjacent the exhaust port. A sound receiver portion having a capacitor microphone is provided within the exhalation pipe at a site upstream of the exhaust valve. When voice is uttered while the mouthpiece is held in the mouth, exhaled air is emitted from the exhaust port through the exhalation pipe and the exhaust valve, so that the capacitor microphone is less liable to noise trouble due to bubbles produced at the exhaust port, or on the downstream side. Speech transmission is made underwater by a waterproof speaker on the basis of an output of the capacitor microphone.

REFERENCES:
patent: 3064089 (1962-11-01), Ward
patent: 3174129 (1965-03-01), Laughlin et al.
patent: 3218607 (1965-11-01), Brock et al.
patent: 3611280 (1971-10-01), Sheehy

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