公开(公告)号：US4491699A

公开(公告)日：1985-01-01

申请号：US254428

申请日：1981-04-15

Applicant: Martin J. Walker

Inventor： Martin J. Walker

IPC: H04M1/05 ,  H04R1/08 ,  H04R27/04 ,  H04R1/44

CPC classification number: H04R1/083 ,  H04M1/05 ,  H04R27/04

Abstract: A dual communication system is disclosed including a microphone for mounting for use by a wearer of a protective face mask, the output signal from the microphone being communicated to both a speaker system for local, audible broadcast and to a transmitter for remote broadcast by radio signal.

Abstract translation: 公开了一种双通信系统，其包括用于安装以供佩戴者使用保护性面罩的麦克风，来自麦克风的输出信号被传送到用于本地，可听广播的扬声器系统和用于通过无线电信号进行远程广播的发射机 。