Swallow counters
US4468797A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 3, 1982 |
| Grant date | Aug 28, 1984 |
| Priority date | — |
| Expiry date | Feb 3, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K23/667
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The swallow counter includes a two modulus prescaler which selectively divides a frequency of an input pulse according to a signal level of a control signal for producing a frequency divided signal, a first programmable counter which starts counting in response to the frequency divided signal to produce a first code signal, a second programmable counter which starts counting in response to the first code signal for producing a second code signal, a first code detector for detecting a specific code signal of the first and second code signals to produce a first pulse signal, a third programmable counter which, in response to the frequency divided signal, starts to count for producing a third code signal, a second code detector for detecting a specific bit of the third code signal for producing a second pulse signal utilized as a reset signal of the first to third programmable counters, a flip-flop circuit for selectively outputting a reset or set signal in response to the first or second pulse signal, and a period counter responsive to the reset or set signal for producing a first or second level of the control signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.