| 摘要 |
A digital filter including an Infinite Impulse Response (IIR) digital filter; limit cycle suppression signal generating means for generating a limit cycle suppression signal whose amplitude level is larger than a critical input amplitude level in a dead band range in which an output of the IIR digital filter is set to a dead band amplitude level and whose frequency component exists in only a useless frequency band of a signal system; and adding (subtracting) means for adding (subtracting) an input signal to be inputted to the IIR digital filter and the limit cycle suppression signal and for inputting an output to the IIR digital filter.
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