公开(公告)号：SG90028A1

公开(公告)日：2002-07-23

申请号：SG1998000547

申请日：1998-03-14

Applicant: IBM

Inventor： KENNETH J GOODNOW ,  CLARENCE R OGILVIE ,  WILBUR DAVID PRICER ,  SEBASTIAN THEODORE VENTRONE

IPC: G06F9/46 ,  G06F12/08 ,  H04M3/00

Abstract: A call progress analysis system is provided which is generic to any telecommunications system with which it is used due to configurable detection parameters. A signal on a channel of the telecommunications system is detected in intervals of changing frequency composition and compared to stored pattern descriptors, each of which defines a different call progress signal. In an alternative embodiment of the invention, a frequency mask is computed that is specific to a user-defined call progress analysis class. This frequency mask is used to make the DSP receiver ignore frequencies that are not part of any call progress pattern in a particular class. The frequency mask can be used in a frequency detection mode or an energy detection mode. In either mode, the detector can be customized for each channel.