Robert J Kraemer

US Patent:

51425696, Aug 25, 1992

Filed:

Apr 23, 1990

Appl. No.:

7/512982

Inventors:

George W. Peters - Palm Bay FL
Jonathan D. Luckey - Melbourne Beach FL
Robert H. Kraemer - Melbourne FL
Scott S. Parker - Melbourne FL

Assignee:

Data Accessory Corporation - FL

International Classification:

H04M 342

US Classification:

379201

Abstract:

A ringing cadence filtering apparatus, which controllably prevents a subscriber device receiving ringing signals other than those having a prescribed cadence, is interposed betweeen a telephone line and a line device that has been assigned one of the telephone numbers of a multi-cadence service. It includes a controlled switching circuit through which a communication path between the telephone line and the line device connection port is normally interrupted. When a rining signal is present on the telephone line, whether or not the interruption is terminated and a path provided through the apparatus will depend upon whether the ringing cadence is that of the telephone number of the line device. To effect this determination, the telephone line input port is coupled to a plurality of ringing signal cadence detection circuits, each of which is responsive to a respectively different ringing cadence. However, only one of the cadence detection circuits has its output coupled to control the controlled switching circuit.