Frequency searching method and apparatus
US6819731B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 7, 2000 |
| Grant date | Nov 16, 2004 |
| Priority date | — |
| Expiry date | Apr 12, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03J7/18
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The invention provides a method for searching the frequency range of a digital data receiving device, said method including the steps in one embodiment of firstly identifying and disregarding analogue carrier frequencies in the range, then proceeding to estimate the initial starting frequency for a digital carrier by dynamic real-time pre-processing of the spectrum profile and then obtaining successive samples of the frequency range from the start position for the carrier until the center frequency for the carrier is located. In one embodiment the method includes the prediction of the center frequency estimations of all digital carriers for respective channels in the range prior to the search commencing. The method reduces the possibility of locking to analogue carriers, and can reduce the time required to perform a search in comparison to the current digital carrier frequency “search & lock” procedure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.