The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 26, 1982
Filed:
Oct. 17, 1979
Gabriele Mazzocchi, Piacenza, IT;
Abstract
A synchronous demultiplexer at a receiving station of a TDM/PCM telecommunication system, operating on an incoming bit stream organized in frames of 32 time slots of eight bits each, comprises a random-access memory having 32 cells loaded with consecutive octets in successive time slots under the control of a writing-address generator, stepped by clock pulses extracted from the bit stream, and unloaded at a similar but not exactly identical rate under the control of a reading-address generator, stepped by locally generated clock pulses. Two series of loading pulses a and b, each lasting for a bit period t, are derived from the extracted clock pulses near the beginning and near the end, respectively, of a time slot of duration T'=8t and are fed to a control unit together with a series of unloading pulses c of length 2t occurring once per cycle T'.apprxeq.T' measured by the local clock. The control unit normally selects loading pulses a for timing the transmission of writing addresses to the random-access memory, except when these loading pulses coincide with unloading pulses c which time the transmission of reading addresses to that memory; in the latter instance, loading pulses b are substituted for pulses a.