Digital FM demodulator performing amplitude compensation
US6664849B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 12, 2000 |
| Grant date | Dec 16, 2003 |
| Priority date | — |
| Expiry date | Jul 12, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D3/002
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A digital FM demodulator converts a digital FM input signal to a demodulated signal, detects the amplitude of the digital FM input signal, generates a corresponding amplitude signal, and adjusts the amplitude of the demodulated signal according to the amplitude signal, thereby compensating for variations in the amplitude of the digital FM input signal and removing amplitude distortion from the demodulated signal. This reduces the performance requirements of, for example, a low-pass analog filter preceding the digital FM demodulator in an FM radio broadcast receiver, permitting the analog filter to be implemented in a semiconductor integrated circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.