Method of and system for transcoding binary signals with reduced

Details Method of and system for transcoding binary signals with reduced Method of and system for transcoding binary signals with reduced

1974-06-18

1976-02-10

Britton, Howard W.

Telegraphy

Systems

Chemical

340347DD, H04L 1500

Patent

active

039378810

ABSTRACT:
A bit stream with a bit rate equaling the frequency of a train of accompanying clock pulses is transcoded into a two-level signal voltage having a reduced rate of changeover compared with the rate of alternation between 0 and 1 bits. Upon any shift from one kind of bit (e.g., 0) to the other kind of bit (e.g., 1), a transition between signal-voltage levels occurs in the middle of a clock-pulse cycle; the first bit of the first-mentioned kind (0) in a succession of a plurality of such bits, after a shift from the other kind of bit (1), is translated into a transition between signal-voltage levels occurring at the end of the corresponding clock-pulse cycle. Transcoding is accomplished with the aid of a three-stage shift register whose stage outputs are logically combined. Upon transmission of the signal voltage via a data channel to a remote receiver, the original bit stream is reconstituted by a decoder comprising a four-stage shift register stepped at twice the clock-pulse frequency, again with logical combination of the stage outputs. A timing-signal extractor at the receiver is locked in step with the transmitter, prior to data transmission, under the control of a synchronizing sequence of alternating 0 and 1 bits transcoded into a square wave of half the clock-pulse frequency.

REFERENCES:
patent: 3488662 (1970-01-01), Vallee
patent: 3500385 (1970-03-01), Padalino et al.
patent: 3623041 (1971-11-01), MacDougall
patent: 3697977 (1972-10-01), Sollman et al.
patent: 3705398 (1972-12-01), Kostenbauer et al.

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