CALL PROGRESS SIGNAL DETECTOR

CALL PROGRESS SIGNAL DETECTOR This invention relates to apparatus for automatically connecting computer terminals and the like to telephone lines and further includes means for automatically analyzing telephone line call progress signals indicative of line status. The apparatus includes a band pass...

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Bibliographische Detailangaben
Hauptverfasser:	SOO, SUK S, BRENNEMANN, ANDREW E
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY TELEPHONIC COMMUNICATION TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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Beschreibung
Zusammenfassung:	CALL PROGRESS SIGNAL DETECTOR This invention relates to apparatus for automatically connecting computer terminals and the like to telephone lines and further includes means for automatically analyzing telephone line call progress signals indicative of line status. The apparatus includes a band pass filter, variable gain amplifier, AM detector, a wave shaper, a signal cadence detector and means responsive to said cadence detector for indicating line status.