用dsp实现有限冲激响应滤波器（FIR）算法。通带边缘频率10kHz，阻带边缘频率22kHz，阻带衰减75dB，采样频率50kHz-Dsp to achieve a finite impulse response filter (FIR) algorithm. Passband edge frequency of 10kHz, the stopband edge frequency of 22kHz, and stop-band attenuation of 75dB, sampling fre