How to make effective mosquito sound including text

摘要

As a man become older, the audible frequency becomes narrower from original 20 through 20000Hz, especially in the high frequency side, the degree of its narrowing is critical, and as a result there are frequency band called mosquito sound in which a young man can listen to but an middle or an old man can not listen to. As for how to utilize such a sound we can give a caution to young men so as that it is too wordy for a old man, thinking that a young man probably does the reckless action or trick which a older man probably never does. Here if a simple mosquito sound but that with the actual text not only making a simple mosquito sound but also that with the actual text persuasion or significance will be increased as caution. It was confirmed that a old man cannot listen to but a young man can. The best score was almost 5/5 in case of FM modified sound for every generation young, middle, and old Shortly that middle and old generation cannot listen to it perfectly and young one can listen to it as the unpleasant sound.