jens
7154d5d94e
git-svn-id: http://moon:8086/svn/matlab/trunk@21 801c6759-fa7c-4059-a304-17956f83a07c
35 lines
905 B
Matlab
35 lines
905 B
Matlab
function fdet_eval(f_true, phi_true, knoise_dB, p)
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%
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% Example: fdet_eval(1200, pi/4, -10, [1100 1350 1])
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fs = 48000;
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N = 1024;
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K = 40;
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omega_min = p(1)/fs;
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omega_max = p(2)/fs;
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omega_step = p(3)/fs;
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% Generate signal
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x = exp(j*(2*pi*f_true/fs*(0:K*N-1)'+ phi_true)) + sqrt(10^(knoise_dB/10))*randn(K*N,1);
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[omega, err, dmod, omega_coarse, omega_est] = fdet(x, N, 0, omega_min, omega_step, omega_max);
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f_coarse = omega_coarse*fs
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f_est = omega_est*fs
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error_ppm = 1E6*(1-f_est/f_true)
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close all;
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subplot(4,1,1)
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plot(1:lge(omega), real(dmod)/N, 1:lge(omega), imag(dmod)/N, 1:lge(omega), abs(dmod)/N); grid; legend('Re', 'Im', 'abs()');
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subplot(4,1,2)
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plot(1:lge(omega), err*fs, '-'); grid; legend('error');
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subplot(4,1,3)
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plot(1:lge(omega), omega*fs); grid; legend('f');
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subplot(4,1,4)
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plot(1:lge(omega), angle(dmod), '-*', 1:lge(omega), diff(angle([0 dmod])), 'r-*'); grid; legend('phi', 'dphi');
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