Multipath noise reducer, audio output circuit, and FM receiver
US6665526B2 · kind B2 · utility
13Cited by
9References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 14, 2000 |
| Grant date | Dec 16, 2003 |
| Priority date | — |
| Expiry date | Dec 14, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/1669
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A multipath noise reducer detects and removes the individual noise spikes occurring in an interval of multipath noise, thereby reducing the multipath noise with relatively little distortion of the output signal. The threshold signal used to detect multipath noise is varied depending on reception conditions. The gate pulses indicating the presence of multipath noise spikes are preferably expanded by variable amounts, depending on both reception conditions and the signal level. Multipath noise spikes are preferably replaced by a smoothed signal. These provisions further reduce perceived distortion of the audio output signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.