understood how to calculate it. thank you. but how to measure it? i mean if that signal with added noise shown in the picture is sampled and given to us, how do we estimate SNR??
This is accomplished during systems characterization. Measuring the noise is straight forward in many cases. measure the system output during the absence of a signal. This will give you your intrinsic noise. For extrinsic noise, subtract the known signal from the receiver output. How do we know what the signal is? were the ones generating it during our characterization. Some thought will need to be given to minimize signal attenuation and distortion. if it cannot be avoided you can estimate the signal using an adaptive filter.
Okay, nicely explained, but this assumes I already know the power/voltage of the signal AND noise separately. What I have in real life is a signal, that I can sample - so I got an array of values. How do I calculate the SNR from something like that?
The mathematical explanation was good. However, it would have been better if you explained whether it is good to have SNR of 2 or 1/2 or 100. It would be helpful to tell that SNR of 100 is good because signal power is greater than noise power and that an SNR of 1/2 shows that noise power is twice greater than signal power.
Ok it's been 8 years since then and i HAVE GOT to ask you this....Are you awake now? i mean that guy has a voice that possess a power that can put all kinds of creatures to an eternal sleep ....
We are looking for an experienced "electronic noise consultant" who would be assigned to a project involving our client's product. It is a contract based opportunity with good hourly pay. The issue is challenging as our client could not get rid of the electronic noise for some significant time. If you or someone you know of, with solid background in electronics and especially noise troubleshooting and elimination is available, please let us know by responding here to this message or contact us by email and let us provide you more details to see whether this would be a good project for you. Even if you notice this message after long time, we still would like to hear from you as we have from time to time other projects as well needing experienced electronic engineers with expertise in small signals and noise. Thank you in advance if you are willing to help us !
Newbie question, how do I know, by using the SNR that my cablemodem shows on the modem webpage, if I have too much noise or little noise? for instance, I see that it says something about 36dBm in the SNR marker, does that mean that I am getting more signal than noise? By using google I have learned that there is a SNR for the signal on the coaxial cable, that can be affected by cable quality, splitters, installation, bla bla bla. What I want is to know if my installation is affecting the cable modem ability to get good signal and therefore good speeds.
on a cable modem, basically, 0 SNR means you have as much noise as actual signal. If your number is say 20.. then your signal is 10 times stronger then the noise is. Basically, the higher the number, the higher your signal strength is to how much noise. On a cable modem, they usually want it in the 30's or better.. preferably in the mid 30's or better. With yours being at 36, that is right around average for most people that have a decent signal, so there is no problems there. As for the rest of it.. Yes, signal can be effected by the hardware and cabling up to your house, and in it. but those things usually degrade the signal. They do not do much to put noise into it. Things that can put noise into your line is things like, running a cable right next to a light fixture, or many other type of electrical devices. The noise from those things can go into lines that are in close proximity to the device. That is why cabling used to run you internet or cable TV is usually shielded, which helps protect the outside signal get into the cable. If you are having problems with a cable modem, usually your problems will stem from bad connections, bad cabling, or cabling that is not up to par for todays standards, or too long/connections/splitters in the run of cabling. The longer the run, the worse the signal will be, plus things like splitters will drop a chunk of power off of the line on top of it. Todays standards for coax for cable TV and for cable internet, they usually require at least an RG6 cable. Cable from, say, 20 years ago, used RG59. The difference.. the center wire for a RG59 cable is about half the diameter of the center data wire that is in a RG6 cable. Half the wire means twice the congestion and also means that the power can not flow as freely, so it will degrade your signal much faster too. If you have too much degeneration of the signals power, that means that the signal has to be sent out stronger. Think of it this way. If you talk normally, people have no problem understanding you. If you scream at the top of your lungs, then your voice is not as clear and it makes it harder to understand. Basically it is the same thing. The weaker the signal because of signal loss, the louder that things have to yell, which means more information is not read correctly because of it. This is the reason why cable companies, when running a line for data, or for the internet, usually will have the line come in the house, and then immediately have a 2 way splitter. Off that that splitter, one line will be a single run to the cable modem, and one line will then go to another splitter that will run all the TV's in the house. They do not usually do it off of a single splitter because the more splits in the splitter, the more the signal is degraded. Think of it this way. If you have a cup and fill it with water. put one straw in it, and all the water will come out on a constant flow, but, if you add a second straw, the the pressure will drop. add 2 more, and it will drop again, because the pressure of the water is being diverted though, now 4 straws, instead of one. The same thing is being done here. If you have one split, the power will go down, but if you have 4 ways that power can go, then that means all that power that is not going to the way you want it to, is going to go down those other paths. The amount given may not be exact, but will give you a general idea about things. Hope that helps.
Shaun Michalak Actually a SNR of 1 would mean that there is as much noise as signal. A SNR of 0 would mean that there is infinitely more noise than signal, or there is no signal and some noise.
Michael Seymour maybe so, but i guess it is a minor detail. No matter what, if your signal to noise ratio on a cable modem is too low, then there is too much noise, and too much noise means it will not work. and even a SNR or 10 is going to have problems, if it works at all (probably not though), so down to numbers like 0 or 1 or 2, it is all just numbers in a case like this because if values are too low to work, then it is just not going to work. Just knowing where the problem is, i think is more of the important part, and know what good values are, is good enough for most people. I am not saying that not knowing is not good info, but most people asking are asking because they dont know, and only want to know the basics of what will and wont work. so yes, 1 is equal on noise and signal, my fault there, but i think that they got the point. still, thanks for the correction.
![KSI - Thick Of It (feat. Trippie Redd) [Official Music Video]](http://i.ytimg.com/vi/At8v_Yc044Y/mqdefault.jpg)
![Signal-to-Noise Ratio in Wireless Communications [Video 1]](/img/1.gif)
This is my enthusiastic mode. You might find it helpful to play the videos back at 1.5 or 2 times actual speed.
lol
Thanks so much for this.
Learnt this at uni 7 years ago. Lovely to go over it again. I'm always amazed at the power of logs (no pun intended) and bels and how useful they are.
Such a great lullaby to fell asleep
Thank you so much, it was very clear to my and acctually helpfull to a homework that I have at University. Cheers from México
Explain in a clear and systematic way.
Thanks for making such nice video:)
I really like the speed and the way you explain things. Very good. Congratulations!!!!!
A very good summary of signal to noise ratio basics !
Very good, helped me a lot in understanding the basics of SNR
Thank you for this descriptive explanation.
Really really well done (9 years later)
understood how to calculate it. thank you. but how to measure it? i mean if that signal with added noise shown in the picture is sampled and given to us, how do we estimate SNR??
Very good explanation!
Very clear explanation. Thank you!
But in practice, how to extract the noise from a noised signal?
This is accomplished during systems characterization. Measuring the noise is straight forward in many cases. measure the system output during the absence of a signal. This will give you your intrinsic noise. For extrinsic noise, subtract the known signal from the receiver output. How do we know what the signal is? were the ones generating it during our characterization. Some thought will need to be given to minimize signal attenuation and distortion. if it cannot be avoided you can estimate the signal using an adaptive filter.
Thank you... Reading my Sony DSR 570 Cam manual.. regarding HAD CCD, it states S/N: 63dB... ( Looking good : ) ) and now I know a little about S/N dB.
Okay, nicely explained, but this assumes I already know the power/voltage of the signal AND noise separately. What I have in real life is a signal, that I can sample - so I got an array of values. How do I calculate the SNR from something like that?
Love from india.
I appreciate your great work....
i really wish i could explain this to my customer and understand it. they would all leave me alone.
The mathematical explanation was good. However, it would have been better if you explained whether it is good to have SNR of 2 or 1/2 or 100. It would be helpful to tell that SNR of 100 is good because signal power is greater than noise power and that an SNR of 1/2 shows that noise power is twice greater than signal power.
thanks!
great stuff and very very helpful in studying for my PE!
Im pretty sure the voltage SNR in dB is 10log(SNR) and the power is 20log(SNR) as the power is the square of the voltage
ruclips.net/video/2iDQEWaAbDM/видео.html
Thanks for posting this...very interesting info and to the point of how it is calculated or used.
excellent explanation
The SNR dB of the voltage is 10log10(SNR_V) rather than 20log10 ...
That was really helpful, Thank you so much I do appreciate it
Maybe a funny question, where is the noise coming from? What factors/sources produce a noise?
Good work!
But HOW do I MEASURE the SNR in the REAL world?
So is signal to noise ratio calculated signal / noise ?
This is assuming we have our SNR
Great video, thank you very much. !
loved the vid, couldn't help realize you sound a bit like the joker from dark knight tho XD
To state the different measures to improve signal to noise ratio.
Please answer
Very good explanation! I'll refer this video :)
Please help answer... assume that an rf amplifier input has a signal power of 2uw and a noise power of 323nw, what is the signal noise ratio?
Character In the video It's great, I like it a lot $$
what is the difference between (rms of signal) and (rms of noise)?
Thank you.
Very nice
Sir its helpfull .... thanks 👍
Darryl, this was really great- thank you.
Thanks for the helpful video!
Thank you for the video
Thank you so much
Thank you for the video! It's very useful!
Ok it's been 8 years since then and i HAVE GOT to ask you this....Are you awake now? i mean that guy has a voice that possess a power that can put all kinds of creatures to an eternal sleep ....
It would be nice to know the Signal power or single voltage or noise power or Voltage? Where to get this info?
from signal itself
I fell asleep
me too....
hahahaha
1.75 playback speed does the trick
*0.75 playback speed does the trick
Speed it up
SIR,what math do i need to understand signals and systems.i am having trouble here.
Na hum samjhe na woh samjhe na koi samje ... Thank you
Sir how can I increase snr with reduce the time with my regard
very helpful
We are looking for an experienced "electronic noise consultant" who would be assigned to a project involving our client's product. It is a contract based opportunity with good hourly pay. The issue is challenging as our client could not get rid of the electronic noise for some significant time. If you or someone you know of, with solid background in electronics and especially noise troubleshooting and elimination is available, please let us know by responding here to this message or contact us by email and let us provide you more details to see whether this would be a good project for you. Even if you notice this message after long time, we still would like to hear from you as we have from time to time other projects as well needing experienced electronic engineers with expertise in small signals and noise. Thank you in advance if you are willing to help us !
How to upgrade SNR in ADSL ??? i have 8 dB :s :s all câble it okk no problem all sound for phone it okk where is the problem
Pro-Tip: Click the Gear .... Click the Speed..... Select 1.5x Profit
Newbie question, how do I know, by using the SNR that my cablemodem shows on the modem webpage, if I have too much noise or little noise? for instance, I see that it says something about 36dBm in the SNR marker, does that mean that I am getting more signal than noise? By using google I have learned that there is a SNR for the signal on the coaxial cable, that can be affected by cable quality, splitters, installation, bla bla bla. What I want is to know if my installation is affecting the cable modem ability to get good signal and therefore good speeds.
on a cable modem, basically, 0 SNR means you have as much noise as actual signal. If your number is say 20.. then your signal is 10 times stronger then the noise is. Basically, the higher the number, the higher your signal strength is to how much noise. On a cable modem, they usually want it in the 30's or better.. preferably in the mid 30's or better. With yours being at 36, that is right around average for most people that have a decent signal, so there is no problems there.
As for the rest of it.. Yes, signal can be effected by the hardware and cabling up to your house, and in it. but those things usually degrade the signal. They do not do much to put noise into it. Things that can put noise into your line is things like, running a cable right next to a light fixture, or many other type of electrical devices. The noise from those things can go into lines that are in close proximity to the device. That is why cabling used to run you internet or cable TV is usually shielded, which helps protect the outside signal get into the cable.
If you are having problems with a cable modem, usually your problems will stem from bad connections, bad cabling, or cabling that is not up to par for todays standards, or too long/connections/splitters in the run of cabling. The longer the run, the worse the signal will be, plus things like splitters will drop a chunk of power off of the line on top of it. Todays standards for coax for cable TV and for cable internet, they usually require at least an RG6 cable. Cable from, say, 20 years ago, used RG59. The difference.. the center wire for a RG59 cable is about half the diameter of the center data wire that is in a RG6 cable. Half the wire means twice the congestion and also means that the power can not flow as freely, so it will degrade your signal much faster too. If you have too much degeneration of the signals power, that means that the signal has to be sent out stronger. Think of it this way. If you talk normally, people have no problem understanding you. If you scream at the top of your lungs, then your voice is not as clear and it makes it harder to understand. Basically it is the same thing. The weaker the signal because of signal loss, the louder that things have to yell, which means more information is not read correctly because of it. This is the reason why cable companies, when running a line for data, or for the internet, usually will have the line come in the house, and then immediately have a 2 way splitter. Off that that splitter, one line will be a single run to the cable modem, and one line will then go to another splitter that will run all the TV's in the house. They do not usually do it off of a single splitter because the more splits in the splitter, the more the signal is degraded.
Think of it this way. If you have a cup and fill it with water. put one straw in it, and all the water will come out on a constant flow, but, if you add a second straw, the the pressure will drop. add 2 more, and it will drop again, because the pressure of the water is being diverted though, now 4 straws, instead of one. The same thing is being done here. If you have one split, the power will go down, but if you have 4 ways that power can go, then that means all that power that is not going to the way you want it to, is going to go down those other paths. The amount given may not be exact, but will give you a general idea about things. Hope that helps.
Shaun Michalak
Actually a SNR of 1 would mean that there is as much noise as signal. A SNR of 0 would mean that there is infinitely more noise than signal, or there is no signal and some noise.
Michael Seymour maybe so, but i guess it is a minor detail. No matter what, if your signal to noise ratio on a cable modem is too low, then there is too much noise, and too much noise means it will not work. and even a SNR or 10 is going to have problems, if it works at all (probably not though), so down to numbers like 0 or 1 or 2, it is all just numbers in a case like this because if values are too low to work, then it is just not going to work. Just knowing where the problem is, i think is more of the important part, and know what good values are, is good enough for most people. I am not saying that not knowing is not good info, but most people asking are asking because they dont know, and only want to know the basics of what will and wont work. so yes, 1 is equal on noise and signal, my fault there, but i think that they got the point. still, thanks for the correction.
+Shaun - Mate. If you think all noise compared to no signal is a minor detail, compared to one to one, you're either deaf or an idiot.
Many thx :D
1.5 does fine..
I had to put the speed to 1.5x lol
Thnks!
Thanks
Just watch it at x1.75 speed, and it's fine
No i prefer the speed your going at!!
you have a little mistake, because the graphic is ETA/2. You forgotten the 1/2.
Audio in this video needs LPF
just out of interest have you heard of the word "enthusiasm"?
I need more information please share more information
tackar ödmjukast
Great #dwdmotn #NortelTn #Ciena32slot
Who writes average as ave? No, it's avg!
1.25 is my speed but I have a slow brain ;D
it is rather systematic
Lo necesito en español
Rodriguez Charles Thompson Gary Lewis Sarah
guy sounds like rtz
hay
I fell asleep too
valo
of
Brown Helen Davis Michelle Taylor Larry
your mic have bad SNR 😂
I'm gonna have to say play it back at 20 log 10(zzzzzzzz)!
U have captions. For translate in english right corner in ur video above click it. For speed also u can change
Log10power1 is 0
10power 100 is 2
Similarly 1000 is 3 etc
:))
very slow...
His videos are extremely helpful, especially when beginning circuit analysis. If I'm in a rush, I set the video speed to 1.5x haha
thaks for the tip.
good idea, never thought of that :)
500th like
OK
CovidImages need to be invested more than half19
Ga jelas
Kalo gaje kenapa ditonton blok
OK