System for estimating sound pressure levels at the tympanic membrane using pressure-minima based distance
US8571224B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 7, 2009 |
| Grant date | Oct 29, 2013 |
| Priority date | — |
| Expiry date | Jul 24, 2030 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/121
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
In various embodiments, a system is used to provide an apparatus configured to measure sound in an ear canal of a wearer's ear at a distance from a tympanic membrane of the ear. The sound is measured and received by the apparatus to produce a signal. A frequency analysis is performed on the signal to determine output as a function of the frequency and to determine the frequency of the minima (null). Further, a distance equal to a quarter wavelength of the null frequency is calculated. A correction factor associated with the quarter wavelength is retrieved and applied to the output to generate a corrected output. An estimated sound pressure level at the tympanic membrane from the corrected output is produced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.