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:
Feb. 25, 2003
Filed:
Apr. 14, 2000
Yhean-Sen Lai, Warren, NJ (US);
Kannan Rajamani, Edison, NJ (US);
Agere Systems Inc., Allentown, PA (US);
Abstract
A method for designing an all pass filter, in accordance with the present invention, includes providing a plurality of signals having a group delay, and normalizing the group delay to determine a normalized group delay function. Cepstral coefficients of the normalized group delay function are determined for to a denominator polynomial of a transfer function of the all pass filter wherein a magnitude function and the normalized group delay function of the denominator polynomial are related through the cepstral coefficients. The denominator polynomial coefficients are determined through a non-linear recursive difference equation by employing the cepstral coefficients.