Circuit for detecting word sequences in a modem

Details Circuit for detecting word sequences in a modem Circuit for detecting word sequences in a modem

1994-12-20

1997-08-26

Bocure, Tesfaldet

Pulse or digital communications

Transceivers

Modems

375368, H04B 138, H04L 700

Patent

active

056617526

ABSTRACT:
A device for identifying a determined repetitive sequence of predetermined signals arriving on a modem. The device includes a delay circuit so that all the words of a sequence are simultaneously present; a combination circuit for providing a combined word; a circuit for calculating the modulus of each combined word and for comparing this modulus with a threshold; a circuit for counting clock pulses corresponding to the rate at which words arrive; a circuit for inhibiting the counting circuit when the modulus of the combined word is lower than the threshold; and a circuit for providing an identification signal when a predetermined number of clock signals is counted.

REFERENCES:
patent: 4606045 (1986-08-01), Miller
patent: 5202905 (1993-04-01), Sakamoto et al.
IEEE Transactions on Communications, vol. 27, No. 9, Sep. 1979, New York US, pp. 1296-1301, R. Wilson et al. "Generation and Performance of Quadraphase Welti Codes for Radar and Synchronization of Coherent and Differentially Coherent PSK".
Patent Abstracts of Japan vol. 17, No. 328 (E-1385) Jun. 22, 1993 & JP-A-05037511 (NEC).

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