Off-line path modeling circuitry and method for off-line feedbac

Details Off-line path modeling circuitry and method for off-line feedbac Off-line path modeling circuitry and method for off-line feedbac

1997-12-17

1999-11-23

Lee, Ping

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Counterwave generation control path

381 718, A61F 1106, H03B 2900

Patent

active

059914181

ABSTRACT:
An off-line modeling system (50) is provided for modeling a feedback path and a secondary path by calculating feedback neutralization filter taps and secondary path compensation filter taps. The off-line modeling system (50) includes a reference sensor (16), a secondary source (18), an error sensor (20), 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 and the secondary path. The error sensor (20) receives a residual signal generates an error signal e(n). The off-line modeling circuitry (10) receives the primary signal x(n) and the error signal e(n) and generates the modeling signal v(n) while modeling the feedback path and the secondary path.

REFERENCES:
patent: 5018202 (1991-05-01), Takahashi et al.
patent: 5499302 (1996-03-01), Nagami et al.
patent: 5517571 (1996-05-01), Saruta et al.

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