Frequency synthesized tuning system using a microprocessor
US4479248A · kind A · utility
2Cited by
7References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 23, 1982 |
| Grant date | Oct 23, 1984 |
| Priority date | — |
| Expiry date | Sep 23, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03J7/065
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A tuning system is provided in which the tuning function is substantially integrated in a microprocessor. A fixed modulus counter is cascaded with a programmable counter (or timer) found within the microprocesor thereby extending the counting range of the programmable counter. Then by prescaling the output of the local oscillator to a value below the toggle frequency of the microprocessor counter, the microprocessor may periodically measure the output frequency of the oscillator and, if necessary, generate correction signals therefor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.