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.)
Joeel Serge Creteil Girard Pierre Paris Lerouge Claude Paul Henri Maurepas Colardelle, (Frankreich) H04m 15 28
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
International Standard Electric Corp
Original Assignee
International Standard Electric Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by International Standard Electric Corp filedCriticalInternational Standard Electric Corp
Publication of DE2161479A1publicationCriticalpatent/DE2161479A1/de
H04M19/00—Current supply arrangements for telephone systems
H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
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Engineering & Computer Science
(AREA)
Signal Processing
(AREA)
Devices For Supply Of Signal Current
(AREA)
DE197121614791970-12-141971-12-10Schaltungsanordnung zur Erzeugung von tonfrequenten Rufzeichen und eines Ruf taktes, insbesondere fur Fernsprechanlagen
PendingDE2161479A1
(de)
Schaltungsanordnung zum geräuscharmen Ein- und Ausschalten von Impulsen aus einer sinusförmigen Wechselspannung, insbesondere von 16 kHz-Zählimpulsen in Fernsprechanlagen
Mehrstufiger Wechselspannungsverstaerker mit Transistoren, mit einer alle Stufen umfassenden Wechselstromgegenkopplung und mit Verwendung von Zenerdioden als Koppelelemente