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Gary Southard
Gary Southard
Gary C Southard, 85Cookstown, NJ
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Us Patents
Process And Apparatus For Producing Conference Connections In A Pcm Time Multiplex Switching System
US Patent:
4190742, Feb 26, 1980
Filed:
Jun 5, 1978
Appl. No.:
5/912440
Inventors:
Gary D. Southard - Marlton NJ
Assignee:
Siemens Aktiengesellschaft - Berlin & Munich
International Classification:
H04M 356
US Classification:
179 18BC
Abstract:
In a PCM time multiplex switching system total code words are formed from individual PCM words supplied by the conference parties. In the process, intermediately constructed sum code words are stored, up-dated and restored upon the arrival of a new individual PCM word. Each arriving PCM word is also delayed by one pulse frame and subtracted from an intermediate code word to form the total code word which is transmitted to that party from which the delayed code word originates. The intermediate code words are stored in a connection memory which has two sections which receive alternate individual code words and which alternately connect the intermediate code words to an input adder and to an output subtracter for up-dating at the input and code word removal at the output.
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