Back to results
US 4,071,781 AGranted
Pulse duration correction circuit
AssigneeNorthern Telecom Limited
InventorInanc Kayalioglu
Life of this patent
Estimating the term…
Abstract
A pulse duration correcting circuit comprising a comparator and a bipolar averaging circuit for correcting the duration of incoming pulses to a desired standard value is disclosed.
Claims7
A pulse duration correcting circuit comprising:
- a comparator having two inputs, a predetermined one receiving incoming pulses through resistive circuit means, and the other receiving the incoming pulses through a bipolar averaging circuit;
- the output of said comparator being the output of the pulse correcting circuit;
- and said resistive circuit means comprising two switching transistors of opposite polarity shunted to a resistor connecting the incoming pulses with said one predetermined input of said comparator, and said switching transistors being controlled at their electrodes by the output of said comparator.
A pulse duration correcting circuit for adjusting the duration of incoming dial pulses to a predetermined value comprising:
- a comparator having a first inverting input, a second non-inverting input, and an output coincident with the output of said circuit;
- said first input having shunted thereto capacitive circuit means and having said incoming dial pulses conducted thereto by means of switched resistive circuit means;
- means for supplying said second input with a rectified average of said incoming dial pulses offset by a predetermined potential;
- and said switched resistive circuit means being a resistor having shunted thereto the conductor paths of an NPN and a PNP transistor, the bases of which are controlled by the output of said circuit.
1 more element
Dependencies are inferred from the claim text.