AM Demodulation code error

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Matt 2023-12-14

评论： Image Analyst 2023-12-14

f_lo = 30e3; % frequency of local oscillator

A_lo = 1; % amplitude of local oscillator

y_lo = A_lo*sin(2*pi*f_lo*time');

y_demod = y_lo.*filt_received;

demod_sig_FD = fft(y_demod); % calculate frequency domain of audio

demod_sig_FD_amp = abs(demod_sig_FD)/no_of_pnts; % calculate the amplitude of frequency domain

demod_sig_FD_amp_adj = fftshift(demod_sig_FD_amp); % adjust the frequency sides

figure;

semilogy(freq, filt_rec_sig_FD_amp_adj, 'b');

hold on;

semilogy(freq, demod_sig_FD_amp_adj, 'r');

xlim([10, freq_max]);

grid minor;

box on;

xlabel('Frequency (Hz)');

ylabel('Amplitude');

legend('Filtered Received', 'Demodulated');

title('Frequency Domain of Filtered Received and Demodulated Signals');

Error is y_demod = y_lo.*filt_received;

Arrays have incompatible sizes for this operation.

Sulaymon Eshkabilov 2023-12-14

These vars are not given: time, filt_received, no_of_pnts, freq, filt_rec_sig_FD_amp_adj

Image Analyst 2023-12-14

This is a duplicate post. I already have an Answer posted in the other one.

Are they 100% duplicates, or is one somehow better than the other? Regardless, the answer I started there is still valid.

Which one do you want to continue the conversation in? I can delete the other one.

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