System for spatially and temporally transposing data words array

Details System for spatially and temporally transposing data words array System for spatially and temporally transposing data words array

1983-10-25

1986-07-22

Buczinski, S. C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

375 21, 179 15S, 178 2204, 178 2209, 370 68, H04N 7167, H04L 900, H04Q 1104

Patent

active

046022830

ABSTRACT:
A train of incoming data words, specifically digitized video samples arrayed in frames of Y lines of X pixels each which have already undergone a 2-dimensional spatial transformation, is scrambled by being divided into Z sequences (frames) whose data words are temporarily written in respective cells of Z.sup.2 storage units of a memory of dynamic-RAM Type. The Z.sup.2 storage units, each divided into Z sections, are read out in cyclic-succession--at a rate of one cell per unit--and each cell is reloaded immediately after being vacated. Reading and writing occurs for one set of Z sequences in a first addressing mode, conforming to the order of arrival of the data words in the incoming train, and for the next set in a second addressing mode involving the grouping of homologous data words of respective sequences into successive series of Z data words each. The two addressing modes alternate for consecutive sets and the outgoing train so formed can be subjected to a further transformation before being transmitted to a remote station for unscrambling.

REFERENCES:
patent: 3773977 (1973-11-01), Guanella
patent: 4405942 (1983-09-01), Block et al.
patent: 4434323 (1984-02-01), Levine et al.
Saito et al, "PCM Toll Switching Networks Using Partial-Access Pulse Shifters, Electronics and Communications in Japan, 1976, pp. 53-62.

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