Transient signal detector with temporal hysteresis

Details Transient signal detector with temporal hysteresis Transient signal detector with temporal hysteresis

1998-08-24

1999-10-26

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

327 24, 327205, H03K 5153

Patent

active

059735163

ABSTRACT:
A subscriber line interface circuit which includes a transient signal detector with temporal hysteresis. During steady state operation, the drive current for the subscriber loop allows the loop to respond to changes in loop conditions according to a steady state time constant of the loop filter. Upon detection of a line voltage transient which exceeds a predetermined threshold in either a positive or negative direction, the filter time constant is significantly reduced (e.g., 100:1) and held at such reduced value following the initial transient and for a predetermined time period after the line voltage has fallen back below such predetermined threshold. This allows the transient conditions to be fully compensated prior to resetting the filter time constant back from the lower transient value to the higher steady state value.

REFERENCES:
patent: 3990048 (1976-11-01), Kanitz et al.
patent: 4340854 (1982-07-01), Jones et al.
patent: 4854167 (1989-08-01), Czarnocki et al.
patent: 5166550 (1992-11-01), Matsubara et al.
patent: 5736826 (1998-04-01), Hrassky

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