Analog noise cancellation system using digital optimizing of variable parameters
US5440642A · kind A · utility
18Cited by
8References
9Claims
0Family size
Inventors
Key dates
| Filing date | Sep 20, 1993 |
| Grant date | Aug 8, 1995 |
| Priority date | — |
| Expiry date | Sep 20, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R3/002
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A digitally controlled analog cancellation system containing an analog noise cancellation circuit with a residual microphone (39) with a digital virtual earth controller (40) for optimizing variable parameters employed in the analog cancellation circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.