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git-svn-id: http://moon:8086/svn/vhdl/trunk@1495 cc03376c-175c-47c8-b038-4cd826a8556b
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jens
2021-03-23 15:08:51 +00:00
parent 98f2150ec7
commit 7bb287e303
1 changed files with 57 additions and 0 deletions
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lib/radio/ddc/ghdl/tb_results.m
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% Read data
function tb_results()
%fa = 100.0;
fa = textread('fa.txt')/1E6
R = textread('ratio.txt');
N = textread('nstages.txt');;
M = 1;
fa_dec = fa/R
N_pfir = 63;
I_out_dec = textread('i_dec.txt')';
Q_out_dec = textread('q_dec.txt')';
I_out_fir = textread('i_fir.txt')';
Q_out_fir = textread('q_fir.txt')';
N_dec = length(I_out_dec)-2*N_pfir;
N_fft_dec = N_dec
N_fft2_dec = N_fft_dec/2;
N_fir = length(I_out_fir)-2*N_pfir;
N_fft_fir = N_fir
N_fft2_fir = N_fft_fir/2;
fft_y2_fir = 2/N_fft_fir*abs(fft(I_out_fir(2*N_pfir+1:N_fft_fir+2*N_pfir).*hann(N_fft_fir)'));
fft_y2_dec = 2/N_fft_dec*abs(fft(I_out_dec(2*N_pfir+1:N_fft_dec+2*N_pfir).*hann(N_fft_dec)'));
f = (1:N_fft_dec)/N_fft_dec;
g = (R*M)^N;
H = abs(sin(pi*M.*f)./sin(pi.*f/R)).^N;
[v, j] = max(fft_y2_dec(1:N_fft2_dec/2))
H = v*H/H(j);
audiowrite('iq.wav', 0.5*[I_out_dec' Q_out_dec'], 16000, 'BitsPerSample', 16);
audiowrite('iq_cfir.wav', 0.5*[I_out_fir' Q_out_fir'], 8000, 'BitsPerSample', 16);
% Output
close all;
plot(1:length(I_out_dec), I_out_dec, 1:length(Q_out_dec), Q_out_dec); grid;
figure;
cic_plot(M, N, R);
figure;
subplot(2,1,1)
plot(fa/(R*N_fft_dec)*(0:N_fft2_dec),20*log10(fft_y2_dec(1:N_fft2_dec+1)), '-', fa/(R*N_fft_dec)*(0:N_fft2_dec),20*log10(H(1:N_fft2_dec+1)), 'r-');
legend('CIC', 'Droop');
xlabel('MHz');
grid;
subplot(2,1,2)
plot(fa/(2*R*N_fft_fir)*(0:N_fft2_fir),20*log10(fft_y2_fir(1:N_fft2_fir+1)), '-');
legend('CFIR');
xlabel('MHz');
grid;