Browse Prior Art Database

Time Interval Detecting Device

IP.com Disclosure Number: IPCOM000094693D
Original Publication Date: 1965-Apr-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Prot, J: AUTHOR

Abstract

The device is used to detect a pulse duration 0 longer than a predetermined quantity tau or to detect a time interval 0 longer than tau between two consecutive pulses. If the pulse duration or the pulse interval is longer than tau, the circuit delivers a pulse C through its output C. The circuit has capacitor T, two transistors T1, T2 receiving timing pulses, control transistor T4, output transistor T3, and diodes d, d', d''.

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Time Interval Detecting Device

The device is used to detect a pulse duration 0 longer than a predetermined quantity tau or to detect a time interval 0 longer than tau between two consecutive pulses. If the pulse duration or the pulse interval is longer than tau, the circuit delivers a pulse C through its output C. The circuit has capacitor T, two transistors T1, T2 receiving timing pulses, control transistor T4, output transistor T3, and diodes d, d', d''.

In the reset state, capacitor F is charged to a voltage V through resistor r and diode d. T4 is off. Timing pulses A from input A cause, periodically, T1 and T2 to conduct. As long as T4 is off, no voltage variation is produced at K.

If through B, a signal B negative with respect to level a, sets T4 on, voltage V is no longer applied to capacitor T. Each time T1 and T2 conduct, capacitor T partially discharges, and voltage K at K decreases progressively. If the negative signal lasts longer than time tau, voltage K reaches the conducting threshold of T3 causing T3 to deliver pulse C through C. If the negative signal ends before time tau, voltage V is reapplied to capacitor T. No adequate voltage variation occurs at K and T3 remains off delivering no pulse through C.

In steady state operation, a signal negative with respect to level a is equivalent to the interval between two consecutive pulses positive with respect to level b. The reference time interval tau is given with a precision lack equal to b. With tau >>...