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:
Mar. 06, 2001
Filed:
Dec. 17, 1997
Sen M. Kuo, DeKalb, IL (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
An off-line modeling system (,) is provided for modeling a feedback path by calculating filter taps. The off-line modeling system (,) includes a reference sensor (,), a secondary source (,), and an off-line modeling circuitry (,). The reference sensor (,) receives a noise signal and a feedback signal (,) and generates a primary signal x(n) in response. The secondary source (,) receives a modeling signal v(n) and provides the modeling signal v(n) to the feedback path. The off-line modeling circuitry (,) includes a signal discrimination circuitry (,), a modeling signal generator (,), a feedback path modeling adaptive filter (,), and associated adaptive algorithm (,) and a summing junction (,). The signal discrimination circuitry (,) receives the primary signal x(n) and generates a modified modeling signal v′(n). The modeling signal generator (,) generates the modeling signal v(n). The feedback path modeling adaptive filter (,) receives the modeling signal v(n) and uses adaptive algorithm (,) to process the modeling signal v(n). In doing this, adaptive algorithm (,) calculates the filter taps. The summing junction (,) subtracts the output signal from the modified modeling signal v′(n) to generate the modeling error signal which is used by the adaptive algorithm (,).