How can I add a shifted version of a signal to the original signal?

Question

Kaviya Baiju Thoppil 2018-9-20

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/420037-how-can-i-add-a-shifted-version-of-a-signal-to-the-original-signal

评论： Honglei Chen 2018-10-2

I have a complex signal x of size (1,4096), I want to add another signal y which is the shifted version of x by 0.3. I am working on signals in frequency domain here. I tried delayseq() function but did not give me a shifted sequence it just overlaps on x. Could you tell me another way of delaying or advancing or shifting x???

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Rishabh Rathore 2018-9-27

Delaying a signal does not change the frequencies that are present in the signal and since your signal is in frequency domain, you observe the overlap of the initial signal and the shifted signal. Try converting your signal to time domain then shift the signal and add. Then convert the resulting time domain signal to frequency domain. This way you should be able to observe the change.

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Honglei Chen 2018-9-24

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/420037-how-can-i-add-a-shifted-version-of-a-signal-to-the-original-signal#answer_338227

Can you clarify why the result of delayseq() does not satisfy your needs? Thanks.

2 个评论
显示无隐藏无

Kaviya Baiju Thoppil 2018-10-2

在 MATLAB Online 中打开

fig.jpg

Thank you for your replies. Delayseq() gives me a result that is not time shifted in frequency or time domain. I tried applying the function in time domain adding it and converting it back to the frequency domain. I will attach a figure of the signal i get you can clearly see there is no time shift. Is there any other way to shift a signal and add it to the original signal?

 Ts=8e3;
p=ifft(ifftshift(qomega));
y=delayseq(p,rmsspectralwidth,Ts);
delay_signal=fftshift(fft(y+p));
plot(fs,[abs(qomega);abs(delay_signal)]);
legend