分段线性插值法的思想精髓是， 把曲线看作若干段首尾相连的直线 段；根据每段直线的斜率来求算该线段所在区段内的数据值。相邻两 个线段的接点称为标定点。由下图可知，当标定点选择合理时，计算 结果可以非常接近实际值。 -The spirit and essence of the piece-wise linear interpolation curve as several segments of the end-to-end straight-line segment calc

MT402是一种单声道USB麦克风方案，内置sigma-delta ADC、麦克风前置增益放大器、 锁相环、音量增益调节器和USB收发器。它是非常适合USB电脑麦克风录音的应用。即插即用，无需安装驱动程序。-MT402 is a mono USB microphone solutions built sigma-delta ADC, microphone pre-amplifier gain, PLL, volume gain regulator and USB transceiver.