System for computationally efficient active control of tonal...

Details System for computationally efficient active control of tonal... System for computationally efficient active control of tonal...

2007-05-29

2007-05-29

Chin, Vivian (Department: 2615)

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Counterwave generation control path

C702S056000, C700S280000

Reexamination Certificate

active

10083773

ABSTRACT:
A noise or vibration control system reduces a sampling rate and reduces a control rate to improve computation efficiency. The present invention permits the use of a sample frequency (fs) that is less than twice the frequency of interest (fd). The sensed signals are filtered to extract a particular frequency range with a lower bound given by (2n−1)*fs/2 and an upper bound given by (2n+1)*fs/2, where n is an integer chosen so that the frequency of interest (fd) is within the extracted frequency range. The control commands are also calculated at a reduced rate, which is dependent upon the bandwidth of the tone, rather than the absolute frequency of the tone. Rather than updating the control signals directly on the sampled sensor data ykas it enters the computer, the control computations are done on the harmonic components akand bk, or equivalently on the magnitude and phase.

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