الفهرس 
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Abstract
(i)
SUMA1ARY
Different ua t hersa t.i ca L models for deoigning digital
filters have been discussed and revealed that an optimum
frequency r e sp onac cha rac t er Ls t.Lc s (i.e., minimum band width
with minimum t erminaloscilla ti ons) are obtained wit hl,n the
following constraintG :-
1) The filter ui.z e parameter N. could be taken as high as
possible to reduce the vzi.d t h of the response function. Although
lower values of N cav e the computation time, an undesired inc-
rease in the width of t he response function as well as an inc-
rease in the ~pl!tude of the terminal oscillations occured
which increase the resp onae for frequencies out of the selected
band.
2) The best choise of the filter’s cutoff frequency, Pc’ is
zero. (11his permi t s a reduction in the wid t h of the response
function whi ch r-ea.Li z.e s a sharp cutoff in the frequency respo-
nse characterictics.
S) The sine-teruination parameter H should be equal or
slightly less than I/N. The present analysis revealed that
the deviation between the given value of H and the experimen-
tal band width h La vanishes for N > 60.
On the other hand, a computational system has been designed
for the ECLIPSE 3/23U computer to perform the following :
1) The computations of the filter’s response function without
the sine-termination effect.
2) Determination of the parameters ef the suggested sine-
termination function.
3) Computations of the final reap onae function for both low-
and band-pass filters taking into account the consideration of
the suggested aine-function.
Before applying the developed system on real data, an
investigation for the designed computational system took place