Microphone/loudspeaker having a speakerphone mode and a micropho

Details Microphone/loudspeaker having a speakerphone mode and a micropho Microphone/loudspeaker having a speakerphone mode and a micropho

1997-01-16

1998-11-03

Matar, Ahmad F.

Telephonic communications

Substation or terminal circuitry

For loudspeaking terminal

379158, 379160, 379202, 379420, 370260, H04M 356

Patent

active

058320776

ABSTRACT:
A microphone/loudspeaker includes a microphone arrangement and a loudspeaker such that the microphone/loudspeaker operates in a quiescent mode and shifts to a speakerphone mode in response to detecting a battery voltage on a telephone line. 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/loudspeaker is connected to other microphone/loudspeakers 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 the loudspeaker of other microphone/loudspeakers.

REFERENCES:
patent: 4184048 (1980-01-01), Alcaide
patent: 4658425 (1987-04-01), Julstrom
patent: 4716585 (1987-12-01), Tompkins et al.
patent: 4764953 (1988-08-01), Chern et al.
patent: 4899378 (1990-02-01), Hamer
patent: 4955055 (1990-09-01), Fujisaki et al.
patent: 5193107 (1993-03-01), Parker et al.
patent: 5271057 (1993-12-01), Addeo et al.
patent: 5317567 (1994-05-01), Champion
patent: 5404397 (1995-04-01), Janse et al.

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