Automatic frequency control processing in multi-channel receivers
US7062240B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 22, 2003 |
| Grant date | Jun 13, 2006 |
| Priority date | — |
| Expiry date | Apr 22, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03J2200/11
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A multiple channel receiver (200) includes a communications receiver synthesizer (204) and at least one numerically controlled oscillator (NCO) (406) that produce local oscillator signals that are derived from a common reference oscillator (202). A DSP (212) and CPU (214) perform automatic frequency control (AFC) by adjustment of the reference oscillator (202) based upon a signal received by a receive channel using the local oscillator signal produced by the communications receiver synthesizer (204). The CPU (214) also provides a synchronous indication of adjustments to the reference oscillator (202) to control circuitry for the at least one NCO (406) so that the configuration of the NCO (406) can be altered so as to maintain a substantially constant frequency output during the adjustment of the reference oscillator (202).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.