function eval_smooth(Ta)

fs = 10000;

b = 1;
if (abs(Ta) > 0)
    b = 1/(abs(Ta)*fs);
end;

a = 1 - b;

x = [ zeros(1, 1000) ones(1, 1000) zeros(1, 1000)];
N = length(x);

y = 0;
y1 = 0;
for i=1:length(x)
    y1 = b*x(i) + a*y1;
%    if (Ta > 0)
        y1n(i) = y1;
%    else
        y2n(i) = 2*x(i) - y1;
%    end
end;

subplot(3, 1, 1)
plot(1:N, x, 'r'); grid;
xlabel('Original LFO Wellenform (Square)')
subplot(3, 1, 2)
plot(1:N, y1n, 'r'); grid;
xlabel('Positive smoothed')
subplot(3, 1, 3)
plot(1:N, y2n, 'r'); grid;
xlabel('Negative smoothed')