>> hL = [0.5 0.5]

hL =

    0.5000    0.5000

>> h4L = conv(conv(conv(hL,hL),hL),hL)

h4L =

    0.0625    0.2500    0.3750    0.2500    0.0625

>> 
>> 
>> hH = [0.5 -0.5]

hH =

    0.5000   -0.5000

>> h4H = conv(conv(conv(hH,hH),hH),hH)

h4H =

    0.0625   -0.2500    0.3750   -0.2500    0.0625

>> 
>>