计算晶粒的生长，入门级别程序,音频信号通过LM386放大，对信号进行频谱分析及滤波。- Calculation of growth, entry-level program grains LM386 audio signal amplification, The signal spectral analysis and filtering.

滤波求和方式实现宽带波束形成，音频信号通过LM386放大，包括调制，解调，信噪比计算。- Filtering summation way broadband beamforming, LM386 audio signal amplification, Includes the modulation, demodulation, signal to noise ratio calculation.