I get the wrong signal to noise ratio using snr() from the Signal Processing toolbox.

4 次查看（过去 30 天）
Kevin Jansen
Kevin Jansen 2022-2-14
编辑： Kevin Jansen 2022-2-14
Hi!
I need some help using snr().
When I use snr() on the column vector I want to calculate the SNR of, it returns -10.5526.
I plotted this column vector below, with the peak visible on the right. Clearly the SNR should be around 2-5.
Anyone knows what I am doing wrong?
Thanks in advance!
  2 个评论
AndresVar
AndresVar 2022-2-14
编辑：AndresVar 2022-2-14
edit: clarifcation of snr(x) vs snr(x,y)
is that the full signal and are you saying the peak at index ~460 is the actual signal?
If you use snr(x) then the signal is assumed sinusoidal but your's is not.
So you must use snr(x,y) where y is the assumed noise.
To get noise estimate you can look at the spectrum in the window without signal, or you use the rssq as shown in the example: Signal-to-noise ratio - MATLAB snr (mathworks.com)
Kevin Jansen
Kevin Jansen 2022-2-14
编辑：Kevin Jansen 2022-2-14
Hey! thanks for your answer. Almost the whole range is just noise, only the peak at ~460 is actual signal.
Okay I think I just got it to work by your comment.
I have multiple of these column vectors, where the signal at ~460 stays around the same value.
I made a new vector containing all these signal peak values.
I also made a vector with the same size by taking the value at ~300 of all the data vectors I have.
I used these two signal vector and noise vector and put in in snr(xi,y), and it returned 4.17.
This seems to be correct, thank you!

请先登录，再进行评论。

请先登录，再回答此问题。

回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Descriptive Statistics 的更多信息

标签

Community Treasure Hunt

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

Start Hunting!

Translated by