The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 07, 2011
Filed:
Mar. 15, 2006
Marc Matthey, Neuchâtel, CH;
Marc Matthey, Neuchâtel, CH;
On Semiconductor Trading Ltd., Hamilton, BM;
Abstract
In a listening device such as for example a hearing aid () where an input signal () is received by a microphone (), converted from analog to digital (), digitally processed () including a conversion from a time domain into a frequency domain, converted from digital to analog () and transmitted to a user by means of a loudspeaker (), the internal digital processing () generates an unwanted noise signal, the so called undesired periodic noise (), at specific frequencies. The undesired periodic noise is coupled via ground and the battery () into the signal processing path. According to the invention, the undesired periodic noise is filtered out of the input signal () during the digital signal processing (), after the conversion of the digital signal into the frequency domain.