omega      = 2*pi*2/1000;
t          = [0:1:1000]';
y_temp     = sin(omega*t);

rauschen   = sin(100*omega*t);
y          = y_temp+0.1*rauschen;

y_fil      = pt1m([t,y], 10);

plot(t,y_fil); grid on;hold on; 
plot(t,y_temp,'g'); legend('vor','rück','mean(vor,rück)','blanker sinus');