Reduced VLF overload susceptibility active noise cancellation he

Details Reduced VLF overload susceptibility active noise cancellation he Reduced VLF overload susceptibility active noise cancellation he

1993-06-22

1995-09-19

Kuntz, Curtis

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

381 94, H03B 2900

Patent

active

054523613

ABSTRACT:
The susceptibility of an active noise cancellation system to overloading due to very low frequencies is reduced by subtracting the low frequency components of an applied noise field from the residual signal. Low frequency components of the applied noise field outside the normal range of human hearing are detected by an external sensor and isolated by a filter circuit. The isolated low frequency signal is subtracted from the residual signal, resulting in a modified residual signal with reduced low frequency components. The cancellation system thus eliminates very low frequency cancellation signals, without sacrificing bandwidth or system performance within the audible range.

REFERENCES:
patent: 4527282 (1985-07-01), Chaplin et al.
patent: 4837834 (1989-06-01), Allie
patent: 4953217 (1990-08-01), Twiney et al.
patent: 5381473 (1995-01-01), Andrea et al.

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