| 摘要 |
PURPOSE:To remarkably curtail the calculation amount at the time of updating a filter coefficient by calculating the filter coefficient of an adaptive digital filter in accordance with the prescribed algorithm, based on an error output and an input for showing a noise, updating the filter coefficient by this calculated filter coefficient, and also, taking notice of a different error sensor at the time of the next sampling, and executing the same algorithm as the foregoing. CONSTITUTION:Reference signal arithmetic parts 51A, 51B and 52B generate reference signals R11, R21, R12 and R22 by a convolutional operation by using an input X(n) for showing a noise sampled successively prescribed synchronization and filter coefficients C11, C21, C12 and C22, and output them to error scanning(ES) algorithm executing parts 51C, 52C. The ES algorithm takes notice of an error signal of one error sensor at every sampling, updates the filter coefficient which corresponds by the reference signal concerned in this error signal by the filter X(FX) algorithm, takes notice of a different error sensor at the time of the next sampling, and executes the processing. |
