语言回放系统，用avr采样声音信号，存储到sd卡里，有放音功能，通过da0832转成模拟信号，再经过功率放大驱动喇叭。-Language playback system, avr sampled sound signal storage to sd card playback function, converted to analog signals by da0832, and then after the power amplifier drives the speaker.