用窗函数法设计FIR数字滤波器

function hd=ideal_lp(wc,M); %Ideal Lowpass filter computation %------------------------------------ %[hd]=ideal_lp(wc,M) % hd=ideal impulse response between 0 to M-1 % wc=cutoff frequency in radians % M=length of the ideal filter % 2-1用窗函数法设计一个线性相