| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a smoothing filter device and a speed detector using it capable of smoothing exactly time-series data which have a dispersion into a value near the center of data dispersion amplitude. <P>SOLUTION: The smoothing filter device 1 which smoothes and outputs data of physical quantity X input discretely serially comprises an addition fraction decision means 2 to decide addition fraction P, a smoothing means 3 to output calculated value Xout(t), by weighting addition of input value Xin(t) of physical quantity X input this time and output value Xout(t-1) prescribed previous period carrying out with addition fraction P, a time-derivative smoothing value calculation means 4 which calculates smoothing value dXs(t) of the time-derivative of output value through calculating time-derivative dXout(t) of the output value. The addition fraction decision means 2 calculates time-derivative dXin(t) of the input value, and decides addition fraction P based on time-derivative dXin(t) of the calculated input value and smoothing value dXs(t-1) of the time-derivative of output value calculated from the time-derivative smoothing value calculation means 4. <P>COPYRIGHT: (C)2008,JPO&INPIT |
