在许多信号处理应用中,微处理机(μP)通过数字/模拟(D/A)转换器来输出计算的数据。模拟输出信号具有阶梯状波形,其持续时间随着D/A转换器输入间隔的增大而增加。这个程序采用软件技术来产生平滑的模拟波形。利用简单的内插法,μP每隔一定时间就把数字输入信号馈送给D/A转换器。通常,D/A转换器每T_1秒得到输入信号(图1a);而且,时间间隔T_1增大,阶梯波持续时间就增加(图1b)。利用内插法,μP在t_1秒内馈送C个中间采样信号 In many signal processing applications, microprocessors (μPs) output calculated data through digital / analog (D / A) converters. The analog output signal has a staircase waveform that increases in duration as the D / A converter input interval increases. This app uses software techniques to produce smooth analog waveforms. Using simple interpolation, μP feeds the digital input signal to the D / A converter at regular intervals. Typically, the D / A converter gets the input signal every T_1 seconds (Figure 1a); moreover, the time interval T_1 increases and the duration of the staircase wave increases (Figure 1b). Using interpolation, μP feeds C mid-sampled signals in t_1 seconds