Circuit for eliminating spurious pulses in a dial pulse stream
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United States of America Patent
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Jul 14, 1981
Grant Date -
N/A
app pub date -
Jun 6, 1979
filing date -
Jun 6, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A digital logic circuit for eliminating spurious transient pulses (21, 32) from among genuine pulses (51) in a binary dial pulse stream. The dial pulse stream is coupled to the circuit input (46). Output (47) is prevented from matching the input unless the duration of the input change exceeds a first time interval (57). Moreover, if the input change exceeds the first time interval and the input change was from a first to a second predetermined binary signal, then the new output signal is held constant for a second time interval (56) regardless of any change in the input signal.
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