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.
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
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