Patent
1975-01-09
1976-05-25
Olms, Douglas W.
H04J 306
Patent
active
039595951
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.
REFERENCES:
patent: 3466397 (1969-09-01), Benowitz et al.
patent: 3809820 (1974-05-01), Sullivan
Grace Kenneth T.
Nikolai Thomas J.
Olms Douglas W.
Sperry Rand Corporation
Truex Marshall M.
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