Signal-to-Noise Ratio
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- เผยแพร่เมื่อ 6 เม.ย. 2011
- Definition of the signal to noise ratio (SNR) and simple computations with it. More instructional engineering videos can be found at www.engineeringvideos.org.
This video is licensed under the Creative Commons BY-SA license creativecommons.org/licenses/b....
![Signal-to-Noise Ratio in Wireless Communications [Video 1]](http://i.ytimg.com/vi/OA4viERrlzA/mqdefault.jpg)
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.
Thank you so much, it was very clear to my and acctually helpfull to a homework that I have at University. Cheers from México
I really like the speed and the way you explain things. Very good. Congratulations!!!!!
Explain in a clear and systematic way.
Thanks for making such nice video:)
A very good summary of signal to noise ratio basics !
Very good, helped me a lot in understanding the basics of SNR
Such a great lullaby to fell asleep
Thanks for posting this...very interesting info and to the point of how it is calculated or used.
great stuff and very very helpful in studying for my PE!
Thank you for this descriptive explanation.
Very clear explanation. Thank you!
Love from india.
I appreciate your great work....
Very good explanation!
Very good explanation! I'll refer this video :)
That was really helpful, Thank you so much I do appreciate it
Really really well done (9 years later)
excellent explanation
Great video, thank you very much. !
Thanks for the helpful video!
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 ....
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.
i really wish i could explain this to my customer and understand it. they would all leave me alone.
Good work!
Thank you for the video
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??
Thank you.
Thank you so much
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?
Very nice
very helpful
Darryl, this was really great- thank you.
loved the vid, couldn't help realize you sound a bit like the joker from dark knight tho XD
Many thx :D
Maybe a funny question, where is the noise coming from? What factors/sources produce a noise?
Thanks
Sir its helpfull .... thanks 👍
The SNR dB of the voltage is 10log10(SNR_V) rather than 20log10 ...
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!
SIR,what math do i need to understand signals and systems.i am having trouble here.
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
th-cam.com/video/2iDQEWaAbDM/w-d-xo.html
Thnks!
To state the different measures to improve signal to noise ratio.
Please answer
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.
So is signal to noise ratio calculated signal / noise ?
This is assuming we have our SNR
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?
It would be nice to know the Signal power or single voltage or noise power or Voltage? Where to get this info?
Character In the video It's great, I like it a lot $$
I fell asleep
me too....
hahahaha
1.75 playback speed does the trick
*0.75 playback speed does the trick
Speed it up
Sir how can I increase snr with reduce the time with my regard
what is the difference between (rms of signal) and (rms of noise)?
But HOW do I MEASURE the SNR in the REAL world?
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.
No i prefer the speed your going at!!
tackar ödmjukast
1.5 does fine..
Just watch it at x1.75 speed, and it's fine
Pro-Tip: Click the Gear .... Click the Speed..... Select 1.5x Profit
Na hum samjhe na woh samjhe na koi samje ... Thank you
it is rather systematic
Great #dwdmotn #NortelTn #Ciena32slot
I had to put the speed to 1.5x lol
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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
hay
Audio in this video needs LPF
guy sounds like rtz
valo
1.25 is my speed but I have a slow brain ;D
I fell asleep too
of
just out of interest have you heard of the word "enthusiasm"?
I need more information please share more information
Who writes average as ave? No, it's avg!
you have a little mistake, because the graphic is ETA/2. You forgotten the 1/2.
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
:))
500th like
OK
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 :)
your mic have bad SNR 😂
Ga jelas
CovidImages need to be invested more than half19
OK