| 摘要 |
An off-line modeling system (50) is provided for modeling a feedback path by calculating filter taps. The off-line modeling system (50) includes a reference sensor (16), a secondary source (18), and an off-line modeling circuitry (10). The reference sensor (16) receives a noise signal and a feedback signal (22) and generates a primary signal x(n) in response. The secondary source (18) receives a modeling signal v(n) and provides the modeling signal v(n) to the feedback path. The off-line modeling circuitry (10) includes a signal discrimination circuitry (54), a modeling signal generator (64), a feedback path modeling adaptive filter (60), and associated adaptive algorithm (62) and a summing junction (58). The signal discrimination circuitry (54) receives the primary signal x(n) and generates a modified modeling signal v'(n). The modeling signal generator (64) generates the modeling signal v(n). The feedback path modeling adaptive filter (60) receives the modeling signal v(n) and uses adaptive algorithm (62) to process the modeling signal v(n). In doing this, adaptive algorithm (62) calculates the filter taps. The summing junction (58) subtracts the output signal from the modified modeling signal v'(n) to generate the modeling error signal which is used by the adaptive algorithm (62).
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