Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
H04M1/00—Substation equipment, e.g. for use by subscribers
H04M1/64—Automatic arrangements for answering calls; Automatic arrangements for recording messages for absent subscribers; Arrangements for recording conversations
H04M1/65—Recording arrangements for recording a message from the calling party
Landscapes
Engineering & Computer Science
(AREA)
Signal Processing
(AREA)
Telephone Set Structure
(AREA)
Reciprocating, Oscillating Or Vibrating Motors
(AREA)
Acoustic surveillance or monitoring of premises, rooms, etc. - using microphone to generate signal for input into discriminator which outputs release or trip signal when monitoring signal satisfies various criteria
Verfahren für den Betriebsablauf eines automatischen Telefonanrufbeantworters mit Aufzeichnung ankommender Gespräche, und Gerät zur Ausführung des Verfahrens
Fernsteuerung für an Fernsprechnetze angeschlossene Diktiermaschinen zur Aufzeichnung und Wiedergabe von Magnetogrammen mittels band- oder drahtförmiger Tonträger.