Title: Digital signal multiplexer/concentrator

Abstract: A synchronous time division multiplex (STDM) system for sampling 1 through N digital input data signals from their respective 1 through N input channels at their respective frequencies F.sub.1 through F.sub.N for concentration and retransmission over a single output channel at a frequency F.sub.0 >.SIGMA. F.sub.n is disclosed. The data bit stream of each input channel is alternately coupled to first and second similar sections, A and B, of each input-channel-associated concentrator at fixed successive sample times T.sub.S. While the input data bits are coupled to and stored in the first section A during the sample time 1T.sub.S, the input data bits previously coupled to and stored in the second section B during the immediately previous sample time OT.sub.S are being retransmitted in their concentrated form on the output channel. On the next successive sample time 2T.sub.S the input data bits are coupled to and stored in the second section B while the input data bits previously coupled to and stored in the first section A during the immediately previous sample time 1T.sub.S are being retransmitted in their concentrated form on the output channel. This alternate sample, concentrate and then retransmit operation continues at successive sample times T.sub.S.

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Inventors: Smith, Donald Cameron (Bloomington, MN, US)

Application Number: 539573
Filing Date: 1975-01-09
Publication_date: 1976-05-25
Assignee: Sperry Rand Corporation (New York, NY)
Primary Class(es): 370/537
Other Classes:
US Patent Ref:

3466397	Sep, 1969	Benowitz et al.	179/15.
3809820	May, 1974	Sullivan	179/15.

Other Refs:
Primary Examiner: Olms, Douglas W.
Assistant Examiner:
Attorney: Grace; Kenneth T., Nikolai; Thomas J., Truex; Marshall M.