发明名称 |
Headset for receiving and transmitting signals |
摘要 |
The present invention provides a two-way sound transducer system, including amplification circuitry within an ear-muff type attenuator, to enable the user to listen to principally voice communications (although other forms of sound can be transmitted) from a remote location and in response thereto answer a communication by talking in a natural voice, irrespective of the total surrounding noise present at the location of the user.
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申请公布号 |
US4017797(A) |
申请公布日期 |
1977.04.12 |
申请号 |
US19750547184 |
申请日期 |
1975.02.05 |
申请人 |
COLUMBIA RESEARCH LABORATORIES, INC. |
发明人 |
LAESSIG, JOHN D. |
分类号 |
H04B1/38;H04B1/44;H04R1/10;(IPC1-7):H04B1/44;H04M1/05 |
主分类号 |
H04B1/38 |
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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