Excavating
Patent
1989-11-22
1992-09-08
Smith, Jerry
Excavating
G06F 1100, H04L 1200
Patent
active
051464624
ABSTRACT:
The transmission of digital signals consisting of data blocks, each delimited by one of several possible words (DDi) and enumerated in transmission by enumeration which is reconstructable upon reception even in presence of errors. The transmission is a pseudo-random sequence that assumes e,g, values of 0 or 1, which values are correlated with two data block delimiting words named respectively DD0 and DD1. The reception side forms two pseudo-random sequences, one of which is supplied by a local generator and identical to the transmission sequence, the other sequence being reconstructed according to the revealed data delimiting words. The comparison between the two pseudo-random sequences obtained in this manner in reception provides, after initial synchronization, verification of the correct interpretation of the received data blocks delimiting words and, in case of interpretation errors, applies suitable resynchronization actions for recovering the correct enumeration of received data blocks.
REFERENCES:
patent: 3873920 (1975-03-01), Apple, Jr. et al.
patent: 3914740 (1975-10-01), Han
patent: 4208650 (1980-06-01), Horn
patent: 4791643 (1988-12-01), Molstad et al.
patent: 4791653 (1988-12-01), McFarland et al.
patent: 4821270 (1989-04-01), Mauge
Chung Phung M.
Smith Jerry
Telettra-Telefonia Elettronica
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