Noise removal apparatus and an FM receiver
US6993309B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 12, 2001 |
| Grant date | Jan 31, 2006 |
| Priority date | — |
| Expiry date | Mar 4, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/1661
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A noise removal unit mounted on a car radio according to the invention removes multipath noise and pulse noise from FM demodulated signals. At this time, the noise removal unit removes all of the multipath noise. Also, in case where the generation density of noise is high, the noise removal unit reduces the detection sensitivity so as not to detect pulse noise, particularly of small level, as noise. Comparing to multipath noise, pulse noise is noise rendering a large correction error than multipath noise. Therefore, in case where the generation density of pulse noise is high, by adapting the unit not to remove pulse noise of small level, it is made possible to reduce distortion of the FM demodulated signals to a minimum. Accordingly, it is made to reduce deterioration of the quality of FM voices to a minimum.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.