功能包括：
(1) 音频信号信号输入，从声卡输入、从WAV文件输入、从标准信号发生器输入；
(2) 信号波形分析，包括幅值、频率、周期、相位的估计，以及统计量峰值、均值、均方值和方差的计算；
(3) 信号频谱分析，频率、周期的估计，图形显示幅值谱、相位谱、实频谱、虚频谱和功率谱的曲线。(Functions include:
(1) input of audio signal signal, input from sound card, input from WAV file, input from standard signal generator;
(2) the analysis of the signal waveform, including the estimation of amplitude, frequency, period and phase, and the calculation of the peak, mean, mean square value and variance of statistics.
(3) the analysis of the signal spectrum, the estimation of frequency and cycle, and the graphs showing the curves of amplitude spectrum, phase spectrum, real spectrum, virtual spectrum and power spectrum.)