How to apply one signal's envelope to another signal?

10 次查看（过去 30 天）

Anis Fatini Abdul Aziz 2021-4-18

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/805626-how-to-apply-one-signal-s-envelope-to-another-signal

评论： Anis Fatini Abdul Aziz 2021-4-21

I extract a signal's envelope (Figure 1) and I am trying to apply onto another signal but the modulated output signal (Figure 2) looks really weird. Figure 3 is the signal that I want to modulate, i.e. the one that I want to apply extracted envelope. Here is the snippet of the code:

figure(4)
[env_upper,env_lower] = envelope(env_window)
plot(t_window , env_window) % Plot the entire signal
hold on
plot(t_window, env_upper, t_window, env_lower) % Overlay the envelope on the above plot. Use line spec to change the line colors
hold off
title('Envelope of Referred Signal from Phantom Head')
xlabel ('Time,s');
ylabel ('Voltage, V');
%possible idea
%B_extract = B(30:90)
%Modulate Signal B with A ie. B_extract+A.*B_extract (Amplitude modulation)
load('Test_Sham_Alpha.mat');
EEG.Data = scalingFactor*EEG.Data;
am_mod = envelope(env_window) + y_to_be_modified.*envelope(env_window);
EEG.Data(1,15001:45000) = am_mod;
figure (5)
plot(EEG.Time(1,1:46600) , EEG.Data(1,1:46600))
title('Amplitude Modulated EEG+tACS Signal')
xlabel ('Time,s');
ylabel ('Voltage, V');