How do I calculate the signal to noise ratio of a signal without knowing the noise of the signal?

8 次查看（过去 30 天）
Ross King
Ross King 2022-11-6
回答： Jeff Miller 2022-11-6
I was given an EEG channel and asked to epoch the data around given stimulus times. I plotted the average of these epochs AFTER rejecting any epoch that contained an EEG value greater or less than +/- 300 μV. I am now being asked what the signal to noise ratio (SNR) of this average is? I don't understand this because I am not sure what the noise is in this signal? The videos I have watched seem to need you to know what the noise is to calculate SNR. And the snr function requires you know the noise too. What would be the noise in this signal and how would I calculate this?

请先登录，再回答此问题。

采纳的回答

Jeff Miller
Jeff Miller 2022-11-6
I'm not sure whether this fits your situation, but one way to estimate the noise is to subtract the average of the epochs from each individual epoch. The assumption would be that the real signal is what you see in the average and that the noise is whatever is left over in the individual epochs after you removed that signal.

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 EEG/MEG/ECoG 的更多信息

标签

产品

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by