First draft-switching controller for personal ANR system
US6160893A · kind A · utility
41Cited by
2References
31Claims
0Family size
Inventors
Key dates
| Filing date | Jul 29, 1998 |
| Grant date | Dec 12, 2000 |
| Priority date | — |
| Expiry date | Jul 29, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R5/033
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An active noise control system for use in testing hearing using a pure tone audiometry testing procedure and employing multiple switching controllers with pre-filtering means and a switch to select any one controller to provide a predetermined one and having the ability to configure each switching controller so that the maximum threshold shift occurs for the frequency of the test tone and for modifying each test tone in accordance with a standard calibration frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.