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i think both of ur results are correct but u should pay attention that at the first configuration u have added a large dely to filter and this dealay has appeared as the excess slop on phase response and as a natural result of unwrapping the phase these two dont look like the same.
Re: linear phase
as u know each filter has wo characteristic one is related to it magnitude and another is about its phase because the frequency responce is in general a complex function and has magnitude and phase. the magnitude detemines the amplification or attenuation of each freq. and the...
yes u can do so,u can change the sampling rate ucsing decimation and interpolation, u can use the commands"downsampling","uosampling","interpolate" and "decimate" in MATLAB.
Re: Orthogonal
if two binary sequence of the same length have the inner product equal to zero the it is said that these two sequence are orthogonal. inner product in every spave is defined
in a particular way, usually the cross correlation is defined as inner product in communication
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