Method of and apparatus for automatic frequency control range extension
US6229991A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 13, 1998 |
| Grant date | May 8, 2001 |
| Priority date | — |
| Expiry date | Oct 13, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03J7/045
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
By employing AFC range extension, a high frequency communication device (100) can use a low cost, low accuracy crystal (119) in its reference oscillator (118). AFC range extension involves varying receive bandwidth of the communication device (100) to facilitate AFC or automatic frequency control. In particular, the receive bandwidth is set to a first, wide setting for AFC acquisition purposes (208). Frequency error associated with a received AFC signal is determined (212) and receive reception is adjusted (218) to reduce frequency error in the communication device (100). Once the frequency error is below a predetermined threshold (214), the receive bandwidth is set to a second setting different from the first setting for normal reception (220).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.