Calendar scheduling systems are described. Specifically, the generation part divides the sound signal acquired by the acquisition part into a plurality of sections each having a predetermined time length, then repeats a sorting process of sorting the divided sections as a process of changing the sequence of arrangement of the sound signal, and alters a manner of sorting the sections each time the sorting process is repeated. The HA log corresponds to a cache line that includes multiple of the addresses. One error table is selected from the plurality of error tables according to a density value of a first density component among the plurality of density components and a density value of at least one other density component when performing the error diffusion on the first density component. The lower-base segment is positioned vertically below the exhaust duct. The leaflet includes a first and a second slit extending distally from the proximal edge and defining a free portion of the leaflet between the first and second slits.