一个苹果系统下的绘图软件，开发环境是xcode 2.5，可以运行在mac10.0-10.5的系统下，有绘制曲线、直线、矩形、圆等图形，并且可以输入文字，进行区域剪裁等操作。-An apple systems mapping software, development environment are xcode 2.5, can run at mac10.0-10.5 of the system, has drawn curve, straight, rectangular, round, suc

用于计算声音信号的短时傅立叶变换，默认情况下窗口重叠了50％，计算STFT三个窗口中的矩形并转化为声音信号。-To compute STFT three windows are available in this code Rectangular, Hamming and Hanning. By default window overlapping is set by 50 . One can easily compute the STFT of sound signals.Results ar