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Download Simultaneous multidirectional communication apparatus
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U.S. Patent Feb. 2, 1999 4 Sheet 3 0f 11 5,867,768 1 45 external \ input 41 12a 46 _—§1 repeater -lA telephone 'FEl. function section l/L a c \ St ‘ 42a f1 connector I T A: Z: 47 J;::]microphone 8 speaker 24 z// /fi connector 27 connection detector \\\ 25 22 ‘\“\\\\_ AFsection sw'tch'ng seétioa 21a transmission/ interruption signal 26 \\\\\ transmitter/receiver connector section microphone speaker FIG.3 I 21
