It would therefore be exceedingly difficult for a computer to be successfully adaptive to such variables. Even in the United States and Japan where computer research has ventured into this new frontier, there is still a great deal of experimentation to be done before such a computer could be marketed.
而且，音波屬高低波，為類比信號，需先轉換成電腦能接受的數據信號；然後據以運算，再化成電腦可以辨識的符號，「過程比手寫字的辨識更複雜，因此連英文、日文的語音系統，實用也還有一大段距離。」