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Hi, I am not sure whether I got your question right. Let me try. In 2D you have frequencies along x-axis AND y-axis. They need not be same. So you need a matrix to represent all the frequencies. A value in 2D frequency response A(i,j) gives the amplitude for an x freqeuncy =i and y-frequency=j. So 1-D vector is not enough to represent the 2D frequency response. For a linear phase filter the coefficients are symmetric or antisymmetric. You can quickly verify this using Z-transform. Navan --- Appalayagari Sreedhar <> wrote: > Dear all, > > I am trying to design the 2-D fir filter. i am using > the meshgrid command and calculating the > frequencies. it returns with the values of certain > dimension, > > for eg, meshgrid(9) > > it returns the 9x9 matrix value. > > can anyone explain why we need to take all these > 9x9 values.In the 1-D we will be using only one > frequency vector, but in 2-D is it necessary to take > as such. > > can anyone suggests what significance it adds, > > and also about the coefficienst ,all rows for linear > phase exhibit certain behaviour with varying > coefficients, why it is so. what significance does > it adds > > can anyone explain this and help me i am thankful > for it. > > regds,sree. __________________________________________________ |