| 摘要 |
<p>PROBLEM TO BE SOLVED: To make appropriately detectable a scene change. SOLUTION: In a step S2, the amplitude of each of sub-band signals decomposed into spectrums in a step S1 is detected. In a step S3, the amplitude of each of sub-band signal is smoothed and sampled corresponding to time for smoothing. In a step S4, on the basis of a value F (n, k) of the smoothed sub- band amplitude and a value F (n-1, k) of the preceding sampled smoothed sub- band amplitude, a spectrum change amount D is calculated. In a step S5, it is decided whether the calculated spectrum change amount D is greater than a prescribed threshold or not and in a step S6, processing based on the decided result is executed.</p> |
