Patent ID: 8122076

Claim:
A digital-signal-processing apparatus comprising: a ringing-suppression-coefficient-generating device that detects energy in a high-frequency region of an input signal to obtain an energy detection result, detects level fluctuation in a low-frequency region of the input signal to obtain a level fluctuation detection result at a same time, and generates a ringing suppression coefficient according to an amount of ringing occurred at the input signal using the energy detection result and the level fluctuation detection result; and a ringing suppression device that generates a ringing suppression signal based on high-frequency component of the input signal and the ringing suppression coefficient and suppresses the ringing by giving the ringing suppression signal to the input signal, wherein a control unit generates a low-frequency fluctuation signal by upsampling the input signal, filtering using a low pass filter, and differentiating the filtered signal, wherein the control unit generates a timing signal indicating a peak position of the high-frequency component by upsampling the input signal, and filtering using a high-pass filter, and wherein a sampling unit samples the low-frequency fluctuation signal based on the timing signal indicating the peak position of the high-frequency component when a signal level of the high-frequency component exhibits peaks.