FM discriminator with automatic gain control for digital signal processors
US6002726A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 21, 1997 |
| Grant date | Dec 14, 1999 |
| Priority date | — |
| Expiry date | Nov 21, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D3/007
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method of extracting an information bearing signal .omega.(n) from a base-band signal in the form of an inverse function with a digital signal processor. The processor includes memory and utilizes a minimum number of instructions stored in the memory. The base-band waveform comprises a plurality of complex-valued samples having respective I and Q components. The method includes the steps of receiving a first sample at an instant n having respective I(n) and Q(n) components and defining an interval for evaluating potential values for the I(n) and Q(n) components. Next, a step of transforming said I(n) and Q(n) components is performed to have respective threshold values residing in the predefined interval. Then, a step of estimating the transformed components with a series of non-inverted polynomial functions is carried out over the predefined interval. The method proceeds by extracting the information-bearing signal with the digital signal processor according to the instructions to evaluate the series of non-inverted polynomial functions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.