Active vibratory noise control apparatus

Details Active vibratory noise control apparatus Active vibratory noise control apparatus

2011-01-18

2011-01-18

Chin, Vivian (Department: 2614)

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Within cabin or compartment of vehicle

C381S071110, C381S071100, C381S071800, C331S010000, C331S025000

Reexamination Certificate

active

07873173

ABSTRACT:
A cosine wave over one period is stored as waveform data in a memory, and address shift values based on a phase lag in transfer characteristics from a speaker to a microphone are stored in a memory. An address shift value is read from the memory by referring to the frequency, and waveform data are read from the memory at addresses that are produced by shifting the addresses from which the reference cosine wave signal and the reference sine wave signal are read, by the address shift value. The read waveform data are used as a first reference signal and a second reference signal, which are applied to adaptive notch filters, to suppress vibratory noise.

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