Telephone system for diver communication

Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...

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340 5T, 179 1UW, 179 1VC, H04M 900

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active

041549813

ABSTRACT:
A telephone system for use by divers employing demand breathing apparatus. ounds picked up by each diver's microphone are processed by selective filtering, amplification, rectification and comparison to a reference voltage level to provide logic signals representative of presence or absence of inhalation noise that could mask voice transmissions of other divers or of a tender. The microphone output to listening stations is switched through an attenuation path by the logic signal representing inhalation noise and through a by-pass or full strength path by the other logic signal.

REFERENCES:
patent: 3863027 (1975-01-01), Acks
patent: 3947636 (1976-03-01), Edgar
patent: 4044205 (1977-08-01), Mullarkey

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