Noise canceling apparatus for weight measurement, and noise...

Details Noise canceling apparatus for weight measurement, and noise... Noise canceling apparatus for weight measurement, and noise...

2005-06-14

2005-06-14

Tran, Sinh (Department: 2644)

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

C381S071140, C381S094100

Reexamination Certificate

active

06907128

ABSTRACT:
A noise canceling apparatus (1) comprises an amplifier (10) for amplifying a measured signal (ms) outputted from a measuring device (3), an analog filter (11), an ADC (12), a digital filter (14), a coefficient control section (13), and a data input section (15). The digital filter (14) is a notch filter for attenuating a frequency component of a quantitative signal D(n) outputted from the ADC (12) at a plurality of notches (stop bands). A transfer function of the digital filter (14) is expressed by the product of a plurality of factors each having a root that corresponds to each one of the plurality of notches. The coefficient control section (13) changes a frequency component of a root corresponding to a notch selected from the plurality of notches, and thereafter, expands in a polynomial the transfer function of the reconstructed digital filter (14). On the basis of the polynomial thereby obtained, a new series of filter coefficients is calculated. A filter characteristic is controlled in such a manner that it conforms to a frequency variation of a fixed-period vibration noise, whereby the fixed-period vibration noise that varies in frequency is attenuated with a high degree of precision.

REFERENCES:
patent: 5051942 (1991-09-01), Matsumoto et al.
patent: 5062492 (1991-11-01), Inoue
patent: 5130938 (1992-07-01), Inoue
patent: 5910994 (1999-06-01), Lane et al.
patent: 5960091 (1999-09-01), White et al.
patent: 0429725 (1991-06-01), None

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