G - Physics – 06 – F
Patent
G - Physics
06
F
354/222
G06F 11/00 (2006.01) G01R 23/15 (2006.01) H03K 5/19 (2006.01)
Patent
CA 1066809
DIGITAL ERROR COUNTING CIRCUIT by Ralph LeRoy Kline ABSTRACT OF THE DISCLOSURE An initial error indicated by a pulse at the binary input is applied through a gating circuit to trigger a monostable multivibrator one-shot to start a timing interval. The output of the one-shot is applied to a second gating circuit which inhibits the first gating circuit to prevent retriggering of the one-shot. Subsequent error pulses are then applied directly to a counting mechanism which counts the errors which occur during the predetermined time interval established by the one-shot. An acceptable error density is established by the predetermined time interval for the one-shot in relation to the number of errors that would occur during this predetermined time interval. If the number of errors which occur exceeds the acceptable error density, the counting circuit puts out a signal which may be applied to an alarm (or framing) circuit. Once the error counter produces an output, i.e., exceeds the acceptable error density, the counter applies a binary indication to the second gating circuit which causes the first gating circuit to retrigger the one-shot. Further, each error pulse which occurs before the one-shot times out will now trigger the one-shot. In order for the circuit to reset, an error-free period, equal to the period of the one-shot, must occur. - 1 -
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