Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1978-09-08
1980-08-19
Safourek, Benedict V.
Pulse or digital communications
Spread spectrum
Direct sequence
371 61, 375110, H04L 700
Patent
active
042187702
ABSTRACT:
Characteristic signal state patterns in a self-clocking digital code such as delay modulation (DM), or Miller, coding are used to control a data transmission system. A DM signal is examined (16, 17) for a double-bit-rate information state pattern that is characteristic of a nonreturn-to-zero (NRZ) ONE-ZERO-ONE bit-rate sequence. Detection of the pattern produces a synchronizing pulse that is used to set (20) a clock pulse train to a predetermined signal state. That train is used for sampling (26) time-adjacent, double-bit-rate, input signal, information states in the DM signal to indicate corresponding NRZ states. An NRZ-to-DM encoder (FIG. 7) is also shown, as is one embodiment of each of the encoder (FIG. 10) and decoder (FIG. 11) using read only memory and register logic. Further shown are a detection (46-49) of other double-bit-rate patterns as error indications and a combined use (FIG. 11) of the error and synchronizing indications for end-to-end signaling.
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Bell Telephone Laboratories Incorporated
Phelan Charles S.
Safourek Benedict V.
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