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. 17, 2003
Filed:
Jul. 10, 2000
Arthur Schaub, Wolfhausen, CH;
Bernafon AG, Bern, CH;
Abstract
The suppression of interfering noise in an input signal ( ) takes place in a main signal path ( ), which contains neither a transformation in the frequency range nor a splitting-up into partial band signals, but only a suppression filter ( ). The transmission function of the suppression filter ( ) is periodically newly determined on the basis of attenuation factors, which are determined in a signal analysis path ( ), which lies parallel to the main signal path ( ). The attenuation factors are utilized for the attenuation of signal components in frequency bands with a significant proportion of interfering noise. The suppression filter ( ) is implemented as transversal filter, the impulse response of which is periodically newly calculated as a weighted sum of the impulse responses of transversal band-pass filters. The signal analysis path ( ) comprises transversal half-band filters ( ) with successively reduced processing rate arranged in a tree structure, which enable a splitting up into partial signals in eight or more frequency bands with a high clearness of modulation. In this manner, processing with a low signal delay and an investigation of the proportion of interfering noise in a sufficient number of frequency bands becomes possible at all with a sufficiently high clearness of modulation