System for communicating through partitions

Details System for communicating through partitions System for communicating through partitions

1992-05-19

1995-01-24

Dwyer, James L.

Telephonic communications

Private or single line system

Doorbell system

379164, 379165, 379168, H04M 100, H04M 160

Patent

active

053848381

ABSTRACT:
An intercommunication system for transmitting signals through a door, and having piezo transducer devices mountable on each side of the door, a matrix of analog switches connecting the piezo transducer devices to the input and output of a bridge amplifier, and a TALK switching device which controls which piezo transducer device is connected to the bridge amplifier through the analog switches as a speaker or as a microphone.

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patent: 5228078 (1993-07-01), Bitzmann

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