| 摘要 |
Pulse signals, for example, dial pulses, wink signals or the like, have been corrected to have minimum break and make intervals by employing at least two analog resistor/capacitor type timers, usually connected in tandem. These prior timer arrangements are not readily implemented by employing large-scale integration because of their use of analog circuit components. Indeed, it is desirable to correct pulse signals to have at least minimum break and make intervals (FIG. 2) by employing digital techniques. To this end, a control signal (ENO) for determining the minimum break and make intervals is generated by utilizing a single digital counter (35) and associated logic for controllably supplying first (Y15) and second (Y30) timing signals (from 34) to the counter (36). The frequencies of the first and the second timing signals are selected in relationship to the desired minimum break and make intervals, respectively. An output control circuit (12 or 11 and 12) is jointly responsive to the control signal (ENO) and first (OPR) and second (REL) input signals representative of first and second states, respectively, of a supplied pulse signal for generating a corrected pulse signal (H) having the desired minimum break and make intervals. The control signal inhibits (via 15 and 16) response of the output control circuit (12) to the input signals (OPR and REL) for the desired minimum break and make intervals. Additionally, the supplying (via 20) of the timing signals to the counter (36) is inhibited (by H and H) after each count cycle until there is a change in state of the output signals (H and H) from the output control circuit (12). |
