发明名称 |
Telephone system for diver communication |
摘要 |
A telephone system for use by divers employing demand breathing apparatus. Sounds 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.
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申请公布号 |
US4154981(A) |
申请公布日期 |
1979.05.15 |
申请号 |
US19770861236 |
申请日期 |
1977.12.16 |
申请人 |
U S OF AMERICA NAVY SECRETARY |
发明人 |
DEWBERRY, LARRY F;TUOVILA, ERIC J;WERLE, CHRISTIAN P F |
分类号 |
H04M9/08;(IPC1-7):H04M9/00 |
主分类号 |
H04M9/08 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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