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:
Sep. 03, 2002
Filed:
Jan. 02, 2001
Peter Schöllhorn, Holzkirchen, DE;
Infineon Technologies AG, Munich, DE;
Abstract
The nonrecursive digital filter has variable coefficients for the purpose of shifting the frequency response from one characteristic frequency fc to another characteristic frequency fc The method enables calculating the coefficients of the nonrecursive digital filter for shifting the frequency response of the filter from one characteristic frequency fc to another characteristic frequency fc The coefficients of a prototype of the filter are prescribed or calculated for a given sampling frequency, the continuous time impulse response associated with this prototype is calculated and the impulse response is sampled at the sampling frequency fa =fa * fc /fc The new coefficients are thereby produced. The filter can then be operated with the new coefficients at the old sampling frequency. As an alternative, the new coefficients can be calculated from the coefficients of the prototype of the filter by interpolating the values of the continuous time impulse response at an interval of 1/fa