ANNUNCIATOR

摘要

It is possible to provide an annunciation sound not masked by a life background sound and optimal for the aged and the young. Various works performed at home are clarified and the frequency of the work sound (life background sound) is measured and analyzed so that the domestic background sound where domestic electric appliances are used is quantitatively grasped. Thus, it was possible to obtain annunciators (55, 54, 100, 110, 206) outputting an annunciation sound having excellent frequency of substantially equal to or higher than 1.5 KHz and lower than 3 KHz as an annunciation sound having an optimal frequency and sound pattern of various devices, considering the life background sound.