Speakerphone and extension speakerphone for use in personal emergency response system

A personal emergency response system (PERS) includes a base unit (16) and one or more extension units (20). The base unit includes a speaker (64), a microphone (72), a telephone interface circuit (40), a microcontroller (46), and an autodialer (48). Each extension unit includes a speaker (164), a mi...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	WOODING ANSON WILLIAM, HENDERSON MARTIN E, BRAV ALAN DAVID
Format:	Patent
Sprache:	eng
Schlagworte:	ALARM SYSTEMS ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY ORDER TELEGRAPHS PHYSICS SIGNALLING SIGNALLING OR CALLING SYSTEMS TELEPHONIC COMMUNICATION
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