Pulse width discriminating circuit

Details Pulse width discriminating circuit Pulse width discriminating circuit

1986-07-25

1989-10-10

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

34082552, 34082563, 307234, H04Q 900

Patent

active

048735183

ABSTRACT:
A pulse width discriminating circuit is disclosed which makes possible the selection of pulses having a width less than and greater than predetermined limits. At least one type of pulses can be selected whereas all other pulses are rejected. However, several different types of pulses can also be discriminated in which case a specific indication signal indicating the type of pulses to which a received pulse belongs is generated. A received pulse is used for starting a timer means generating after a first predeterminable time a lower limit signal and after a second predeterminable time an upper limit signal if the received pulse is still present at these times. A latch flip-flop is set by the lower limit signal and is reset by the one of the two following signals which occurs first: either by the upper limit signal or by the delayed trailing edge of the received pulse. An AND-gate which generates the indication signal receives at its first input an output signal from the latch flip-flop if the latter is set, but is disabled to generate the indication signal as long as the undelayed received pulse is present at its second input.

REFERENCES:
patent: 4227181 (1980-10-01), Brittain
patent: 4339723 (1982-07-01), Yee
patent: 4486752 (1984-12-01), Chihak
patent: 4558316 (1985-12-01), Young

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