说明：  产生一个幅度为1和频率为1的正弦信号,用均匀pcm方法分别用8电平和16电平进行量化,在同一坐标轴上画出原信号和以量化信号,比较这两种情况下的sqnr.
(Produce a range of 1 and a frequency of one of the sinusoidal signal with a uniform method pcm level and 8 were 16 to quantify the level in the same axis to draw the original signal and to quantify the signal, comparing the two cases The sqnr.)