s=1580/11713;
vc_ch=[1 2 3 4 5 6 7 8 5 7 6 8];
vc_t1=[0 0 0 0 0 0 0 0 1 1 1 1]*1580;
vc_t2=[1 1 1 1 s s s s 1 1 1 1]*11713;
