(ds) transmitter

H - Electricity – 04 – L

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379/3

H04L 27/00 (2006.01) H04B 14/02 (2006.01) H04M 11/06 (2006.01)

Patent

CA 1260641

ABSTRACT A communication system for connecting a telephone switching office to a data processing center is described. A telephone trunk line from the switching office carries data which is digitally encoded and may be in a compressed format, for example mu-law PCM, and which is derived from remote data terminals. A novel type of modem is connected between the trunk and the data processing center. This is a direct synthesis device which converts the modulated digital data directly to a non-modu- lated digital format readable by the data processing center and, for digital data originating at the data processing center, pro- duces modulated digital data which is transmitted along the trunk to the switching office. The direct synthesis modem is a single, purely digital device which replaces many separate digital/analog modems which are required in conventional systems.

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