Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1986-12-18
1989-02-14
Buczinski, Stephen C.
Pulse or digital communications
Spread spectrum
Direct sequence
375 87, 375120, H04L 702, H04L 2722
Patent
active
048051977
ABSTRACT:
Inherent clock information included in a digital signal of the type in which binary information is represented by signal level transistions which are present on a periodic basis, such as a signal level transistion at a mid-location of a bit interval, is recovered by generating a pulse at each signal level transition, delaying that pulse by a half bit interval and by a full bit interval, respectively, and summing the generated, the half bit delayed and the full bit delayed pulses to recover the clock information. The recovered clock is used to write each binary level included in the received digital signal into a memory from which each stored binary level is read at a reference clock rate. Loss of synchronization between the received and read-out digital signals is detected by sensing a differential of predetermined magnitude in the write-in and read-out rates. Preferably, the detected differential in these rates is used to adjust the read clock rate in a direction which tends to null that differential, thereby restoring synchronism between the read out and written in digital signals.
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Landmann Wolf S.
Martin Gunther
Van Der Jagt Lourens
Buczinski Stephen C.
LeCroy Corporation
Wallace Linda J.
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