| 摘要 |
A digital filter circuit, a digital filter program, and a noise canceling system are provided to form a signal for reducing a noise at a proper time by reducing a process delay. A digital filter circuit includes an ADC(Analog Digital Converter)(121), a first digital filter unit(1213), an operation process unit(122), a second digital filter unit(1231), and a DAC(Digital Analog Converter)(123). The ADC converts a noise signal into a digital noise signal. The first digital filter unit decimates the digital noise signal. The operation process unit generates a digital noise reduction signal based on the decimated digital noise signal. The second digital filter unit interpolates the digital noise reduction signal. The DAC converts the interpolated digital noise reduction signal into an analog signal.
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