| 摘要 |
<p>Microphone/loudspeakers (ML1,ML2,ML3) include a microphone arrangement (M11,M12,M13) and a loudspeaker (LO1,LO2,LO3) and means (LC1,HI1,DE1) to operate as microphone/loudspeakers in the quiescent mode and to shift to a speakerphone mode in response to a battery voltage from a telephone line (T/R). In the quiescent mode the microphone arrangement and the loudspeaker operate substantially independent of each other while in the speakerphone mode they interact on the basis of their respective signal strengths. In a system, the microphone/loudspeakers connect to other microphone/loudspeakers (via JA11, PL21; JA21, PL31; JA13, PL23: JA23, PL33) so that the microphone arrangement of one microphone/loudspeaker couples in tandem to the microphone arrangement of other microphone/loudspeakers, and the loudspeaker of one microphone/loudspeaker couples in tandem to loudspeaker of other microphone/loudspeakers. <IMAGE></p> |
