Constant percent break type dial pulse corrector
US4207436A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 26, 1978 |
| Grant date | Jun 10, 1980 |
| Priority date | — |
| Expiry date | Jul 26, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q1/36
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The first monostable multivibrator of a series connected pair of monostable multivibrators is responsive to each break interval of input dial pulses for establishing a fixed time delay after which the second multivibrator initiates a corrected break interval and starts a first timing capacitor thereof charging at a rate set by a fixed time constant. Each input break interval also causes a capacitor of a second timing circuit to start discharging at a rate set by another fixed time constant, the time that the second capacitor starts discharging being a function of the pulse repetition frequency of input dial pulses. When the charge voltages on the two capacitors are the same values, the output of a comparator resets the second multivibrator to terminate an output break interval so as to cause corrected dial pulses in the output thereof to have a constant percent break.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.