Electrical audio signal processing systems and devices – Acoustical noise or sound cancellation – Acoustic – nonairborne vibration sensing or counterwave emission
Patent
1997-02-28
1998-11-17
Harvey, Minsun Oh
Electrical audio signal processing systems and devices
Acoustical noise or sound cancellation
Acoustic, nonairborne vibration sensing or counterwave emission
381 711, A61F 1106, H03B 2900
Patent
active
058388028
ABSTRACT:
An apparatus for cancelling vibrations includes a reference signal representative of the vibrations to be cancelled, an adaptive control filter producing an output signal based on the reference signal, and an actuator responsive to the output signal to produce vibrations which destructively interfere with the vibrations to be cancelled. The adaptive control filter comprises a circuit for transforming the reference signal into its frequency components, a processor for applying weights to these frequency components, and another circuit for combining the weighted frequency components to provide the output signal of the adaptive control filter. The circuit for transforming utilizes N integer updates of the reference signal to resolve the reference signal into its frequency components. Further, the circuit for transforming is updated n times between successive transformations of the reference signal into its frequency components, where 1<n<N. Moreover, the weights applied by the processor of the adaptive control filter are constrained so that the operation of the adaptive control filter in the frequency domain is substantially equivalent to that of an m weight domain filter, where m is less than or equal to N-n+1.
REFERENCES:
patent: 5233540 (1993-08-01), Anderson et al.
patent: 5309378 (1994-05-01), Beierle
patent: 5416845 (1995-05-01), Shen
patent: 5524057 (1996-06-01), Akiho
Qun Shen et al., "Frequency-Domain Adaptive Algorithms For Multi-Channel Active Sound Control", Second Proceedings on Recent Advances in Active Noise and Vibrations Control, Apr. 1993.
GEC--Marconi Limited
Harvey Minsun Oh
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