Digital Signal Processing Reference
In-Depth Information
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Normalized Frequency
Figure 4.21:
The frequency response of a particular single correlator filter.
function Imp = LVBasicFiltMultCorr(N,LoK,HiK)
% Imp = LVBasicFiltMultCorr(31,0,7)
Imp=0;
fork=LoK:1:HiK
if k==0
k==N/2
A = 1; else;A=2;end
Imp = Imp + A*((-1)ˆk)*cos( 2*pi*k*( 0:1:N-1 )/ N );
end
LVFreqResp(Imp1, 500)
Three filters were generated using the above code with the following calls
Imp = LVBasicFiltMultCorr(30,0,4);
Imp = LVBasicFiltMultCorr(30,5,9);
Imp = LVBasicFiltMultCorr(30,10,15);
the results of which are shown in Fig. 4.22.
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4.9.3 DEFICIENCIES OF SIMPLE FILTERS
Although it is clear that the simple filters we have studied can provide basic filtering responses such as
lowpass, etc., there was in actuality very little or no control over a number of parameters that are important.
These parameters, which are discussed in detail in Volume III of the series (see the Chapter 1 of this
volume for a description of the contents of Volume III), include the amount of ripple (deviation from
