Charles E Simon

US Patent:

40229912, May 10, 1977

Filed:

Sep 18, 1975

Appl. No.:

5/614405

Inventors:

Michael J. Kelly - Melrose Park IL
Alex W. Kobylar - Chicago IL
Robert L. Lindsay - Palatine IL
Satyan G. Pitroda - Villa Park IL
Charles J. Simon - Hinsdale IL

Assignee:

GTE Automatic Electric Laboratories Incorporated - Northlake IL

International Classification:

H04M 356

US Classification:

179 18BC

Abstract:

A conference arrangement for use in a pulse code modulated system including first and second control memories and a comparison logic circuit. Two words corresponding to two channels are read from information memory during each time slot and after proper comparison, the largest sample is transmitted to a third channel. Also included is a dial tone source for supplying dial tone to all terminations in the system by writing a time slot number assigned to the dial tone source and the respective ones of the channel memory words in the control memory associated with the channels.