采用双线性变换法设计一巴特沃斯高通滤波器，其通带截止频率（-3dB点处） =3KHz，阻带上限截止频率 =2KHz，能带衰减不大于3dB,阻带衰减不小于14dB，采样频率 =10KHz。-Bilinear transform design a Butterworth high-pass filter, the passband cut-off frequency (-3dB point) = 3KHz stopband upper cut-off frequency = 2KHz band a