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# 신호및시스템 FinalExam

저작시기 2011.06 |등록일 2014.07.09 한컴오피스 (hwp) | 7페이지 | 가격 600원

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## 본문내용

step5>> step4에서 만든 삼각파 DT를 Up Sampling 함.
TIME DOMAIN에서 확장! FREQUENCY DOMAIN에서 압축!
%==================================================================
% 5. UPSAMPLING in TIME DOMAIN and its DT-FT
% (Note that upsampling period is given as G.)
%------------------------------------------------------------------
xx5 = zeros(1,N); % xx5 1*256행렬 0행렬
WWW = W/2; %16
WWWW = W*2; %64
xx5(1,(-WWWW:G:WWWW)+N/2+1) = xx4(1,(-WWW:WWW)+N/2+1);
% Up Sampling된 삼각파 DT
for k=0:N-1
X5(k+1)=0;
for n=-N/2:N/2-1
X5(k+1) = X5(k+1) + xx5(n+N/2+1)*exp(-j*k*(2*pi)/N*n);
end
end
XX5(1,1:N/2) = X5(1,N/2+1:N); % XX5(1~128)=X5(129~256)
XX5(1,N/2+1:N) = X5(1,1:N/2); % XX5(129~256)=X5(1~128)
XX5 = real(XX5);
drawfig(N,xx5,-1,2,'5. UPSAMPLING in TIME DOMAIN','x_5[n]', ...
XX5,-max(XX4)*0.3,max(XX4)*1.1,'\Rightarrow DT FT RESULTS in FREQUENCY DOMAIN','X_5(\omega)');

step6>> step1에서 만든 sinc파를 DT로 만듬.
TIME DOMAIN에서 sinc DT! FREQUENCY DOMAIN에서 사각파!
%==================================================================
% 6. FREQUENCY DOMAIN FILTER and ITS DT-IFT(=FILTER'S IMPULSE RESPONSE)
% (Scale the LPF to make the interpolation results have its maximum value 1.)
%------------------------------------------------------------------
xx6 = zeros(1,N); %1*256행렬 0행렬

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