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温控 一般是令Ti=0、Td=0。输入设定为系统允许的最大值的60%~70%，由0逐渐加大比例增益P，直至系统出现振荡；再反过来，从此时的比例增益P逐渐减小，直至系统振荡消失，记录此时的比例增益P，设定PID的比例增益P为当前值的60%~70%。(t control An integral term increases action in relation not only to the error but also the time for which it has persis

WAV文件的格式解析，获取纯音频部分的数据，并以波形显示；可回放。(WAV file format analysis, access to pure audio part of the data, and waveform display, playback.)