Infinite impulse response digital filter
AssigneeKabushiki Kaisha Kenwood
InventorTakahiko Kishi
Life of this patent
Estimating the term…
Abstract
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.
Claims5
A digital filter comprising:
- an IIR digital filter;
- limit cycle suppression signal generating means for generating an AC limit cycle suppression signal whose amplitude level is larger than a critical input amplitude level in a dead band range due to occurrence of zero-input limit cycle;
- and
- adding (subtracting) means for adding (subtracting) an input signal to be supplied to the IIR digital filter and the limit cycle suppression signal and for inputting the addition (subtraction) result signal to the IIR digital filter through a digitalization.
Dependencies are inferred from the claim text.