| 摘要 |
A method of, and an apparatus for, identifying a system which allows a filter coefficient to be updated accurately even if noise is mixed. The apparatus for identifying a system includes an adaptive filter for processing a reference input signal to produce an output signal, a subtractor for subtracting the output signal of the adaptive filter from an observed signal, a power-estimating circuit for estimating the power of the reference input signal, and a step-size determining circuit for determining a step size based on the estimated power of the reference input signal. The step-size determining circuit generates a step size according to a function of the power of the reference input signal, which monotonously increases if the power of the reference input signal is smaller than a threshold and monotonously decreases if the power of the reference input signal is greater than the threshold. |
