Dial pulse correction circuit for telephone signaling system

Details Dial pulse correction circuit for telephone signaling system Dial pulse correction circuit for telephone signaling system

1975-12-02

1976-10-26

Stellar, George G.

H04Q 136

Patent

active

039885488

ABSTRACT:
Inverted and noninverted representative dial pulse signals are coupled to associated semiconductor diodes which are connected to opposite sides of a first timing capacitor, each side of the first capacitor being connected through a different associated timing resistor to a supply voltage and connected to an input of an associated NOR-gate. The output of each NOR-gate is coupled to an input of the other NOR-gate. A corrected dial pulse signal is the output signal of one NOR-gate. This output signal is also coupled through the series combination of a second timing capacitor and associated timing resistor to the supply voltage and through the second capacitor and an inverter to another input of the one NOR-gate. A corrected dial pulse signal with a corrected break pulse interval is not produced for an input dial pulse signal having a break pulse interval with a duration of less than a first time interval which is set by the first capacitor, an associated resistor, and the threshold level of the one NOR-gate. If the duration of an input break pulse is greater than the first time interval, the one NOR-gate produces a corrected dial pulse signal with a corrected break pulse interval having a pulse duration which is the longer of the duration of the input break pulse and the duration of a second time interval set by the second capacitor and associated timing resistor.

REFERENCES:
patent: 3092691 (1963-06-01), Burns
patent: 3452220 (1969-06-01), Fritschi
patent: 3504290 (1970-03-01), Earle
patent: 3544724 (1970-12-01), Pento
patent: 3659055 (1972-04-01), Witmore
patent: 3671875 (1972-06-01), Pento
patent: 3700821 (1972-10-01), Savage
patent: 3772474 (1973-11-01), Wisotzky
patent: 3781482 (1973-12-01), Wisotzky
patent: 3794755 (1974-02-01), Hicks
patent: 3908091 (1975-09-01), Waldeck

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