h overlap-save method P点 input (1)segmentx(n)into sections of length L,overlap P-1 points; (2)fill 0 intoh(n)and some section of x(n),then do L points FFT 1P-1 L=25 points (③)calculate y(n) y(n)=IFFT(H(k)X(k) n=0,,L-1 P-1 vop[n] points P-1 (4)the output for this section is "points L-(P-1)points of y[n] L-(P-1),pQints n=P-1,.L-1 圆周卷积中后L-(P1)个点结果与线性卷积相等！input 11 overlap-save method (4) the output for this section is L-(P-1) points of y[n] n=P-1,…L-1 (1) segment into sections of length L, overlap P-1 points; x(n) (2) fill 0 into and some section of , then do L points FFT h n( ) x n( ) y n IFFT H k X k ( ) { ( ) ( )} = (3) calculate y(n) n L = − 0,..., 1 L=25 圆周卷积中后L-(P-1)个点结果与线性卷积相等 P-1 points P-1 points P-1 points L L-(P-1) points P点