Frequency lock detection
US8059774B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 29, 2008 |
| Grant date | Nov 15, 2011 |
| Priority date | — |
| Expiry date | Sep 15, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L7/033
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A system and method are provided for detecting the frequency acquisition of a synthesized signal in a non-synchronous communications receiver. The method accepts a non-synchronous communication signal having an input data signaling frequency, and compares the input data signaling frequency to a synthesized signal frequency. In response to the comparing, a difference signal pulse is generated. More explicitly, the difference signal is generated at a rate responsive to the difference between the input data signaling frequency and the synthesized signal frequency. The method counts synthesized signal pulses occurring simultaneously with the difference signal pulse. If the counted synthesized signal pulses exceed a threshold (before the disappearance of the difference signal pulse), it is determined that the input data signaling frequency is about equal to the synthesized signal frequency, and a lock signal is generated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.