Electrical pulse counters – pulse dividers – or shift registers: c – Systems – Compensation for excess or shortage of pulses
Patent
1987-02-09
1988-10-25
Heyman, John S.
Electrical pulse counters, pulse dividers, or shift registers: c
Systems
Compensation for excess or shortage of pulses
377 47, 377114, H03K 2140, H03K 2340, H03L 700
Patent
active
047808969
ABSTRACT:
A counter slip control circuit is described for digital transmission systems wherein the counter uses a feedback circuit to define the permissible counter states. The slip control input modifies the feedback function so that certain counter states are either repeated or skipped. A repeated counter state is equivalent to retardation of the counter output signal phase. A skipped counter state is equivalent to advancing the counter output signal phase. The slip control gate is eliminated from the clock input line to the counter and instead is included in the feedback path which eliminates the skew problem and permits the equivalent of adding clock pulses without the requirement for logic speeds of twice the normal clock speed.
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Author: Floyd M. Gardner; title: A Cycle-Slip Detector for Phase-Locked Demodulators, dated 9/77; pp. 251-254, IEEE Transactions, vol. IM-26, No. 3.
Caracappa David N.
Heyman John S.
Morris Jeffrey P.
Siemens Transmission Systems, Inc.
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