IMPROVED AUDIO DISTRIBUTION SYSTEM

A signal distribution and communication arrangement controls the broadcast of different types of signals through speakers located in various zones. The system includes a telephone interfaced with a door speaker controller to allow communication between the telephone and a door speaker. A page may be...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	FARINELLI ROBERT P, STEVENSON BRUCE B, UNSELD BILL R
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	DEAF-AID SETS ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKEACOUSTIC ELECTROMECHANICAL TRANSDUCERS PUBLIC ADDRESS SYSTEMS TELEPHONIC COMMUNICATION
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