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What is signal to noise ratio

CR6009A model

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Basically, the signal to noise ratio, measured in decibels, is the difference between the signal output and the inherent noise of the electronics. U want as high a number as possible so that if you listen to music with low level passages you will not hear the intrinsic noise of your electronics.

Posted on May 11, 2015

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The noise is that produced by the working circuits of the item in question. If this is too high the signal (what you want to listen too) will become overwhelmed by noise (generally in the form of hiss). Therefore the higher the signal and the lower the noise the better. This is expressed in a ratio between the two.

Posted on May 06, 2015


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I hav the D60 and I shoot racecars at NIGHT . I have to set it on on ISO 1600 or on Hi 1 to get proper lighting and get alot of blowout around and in the cars . Got any help for me ??

If by "blowout" you mean a grainy appearance, that is electronic noise. Most things in photography are trade offs. The higher the sensitivity your camera is set to, the more of this noise will be present; i.e., you are lowering the signal to noise ratio. The higher the signal to noise ratio, the crisper and cleaner the picture. If you can afford to upgrade from a DX format camera body to an FX body such as the D600 or D800, you will get substantially better results for two reasons. First, the FX format CCD is about the size of a 35mm film frame compared to the DX format which is about 3/4 the size. As a mater of physics. the larger the CCD, the higher the signal to noise ratio. Secondly, these cameras have additional circuitry that your camera does not to boost the signal to noise ratio even further and enhanse there low light capability.

Mar 26, 2013 | Nikon D60 Digital Camera with 18-55mm +...

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D40x sharp spots on long exposure pics

Hi jchp_2001, I want to help you with your question, but without more information from you, I can only guess what you mean?
What do you mean by "sharp spots"? I will assume that you are talking about speckles of white or colors in the deep shadow areas of your pictures or in black areas of night time exposures. What you are seeing is electrical noise generated by your camera's sensor and amplified by other electronic circuitry in your camera. Newer and more advanced cameras have higher signal-to-noise (S/N) ratio circuitry that reduces, but does not entirely eliminate the problem. The S/N ratio is a measure of how much stronger the picture information is than the electrical noise (analogous to to the static you hear on a week AM radio station). The higher this ratio, the fewer artaffects, such as spots, will appear in your pictures. There are a couple of ways to lessen this problem. You could use a shorter exposure time, lower the ISO setting on your camera (of course that would increase the required exposure time and my nullify the benefit), or illuminate the shadow areas with supplemental lighting. The other way is to buy a newer camera that has a higher S/N ratio. One of the main goals in new sensor and camera design is to raise the S/N ratio. Trading in your D40x on a newer model DX (24x16mm sensor) format camera will help. The reason that professionals more advanced photographers spend thousands of dollars on full frame (36x24mm sensor [the same size as a 35mm film slide]) digital cameras such as the D600, D610, D800 or D810 is because the larger sensors have an inherently higher signal to noise ratio. That is in part why your D40x gives you better quality pictures than a Coolpix camera for example, which has a smaller sensor.

Sep 27, 2012 | Nikon D40x Digital Camera

1 Answer

Picture size doesn't fit the screen I tried to adjust the aspect ratio but the option is locked on the menu. What to do? (Olevia TV model lt42hvi

You cannot change aspect ratio when recieving HD signal. Try changing the cable box or satellite box format or aspect ratio.

Dec 30, 2009 | Televison & Video

1 Answer

I keep loosing the internet connection; doesn't stay

I had the same problem with my connection, and in my case it was signal related. I Am using a belkin USB adapter. I downloaded netstumbler(it is free, just google it) and found that you had to have a signal noise ratio of about 22 to have a reliable internet connection that doesn't drop out. So download netstumbler(link below) and see what your current signal noise ratio is, then just place your adapter where you get the best signal noise ratio.
I built myself a modified windsurfer. You just take a A4 paper and glue aluminum foil with the bright side facing outwards. then arch your paper in a semi-circle and place it behind your adapter and angle it in the direction of your connection point. Remember that a line of sight is very important, so if you can place the adapter(assuming a dongle) on the window which is in the direction of of your connection point it will work . Also remeber that rain and wind does influence your signal. i hope this works for you, if not, feel free to mail me with more info on yor problem.

Sep 13, 2009 | Belkin N1 Wireless USB 2.0 Network Adapter...

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When I hook my PS3 to a stereo A/V player or switch box I get a humming noise that gets louder when i turn up sound

Cables are sometimes expensive for a reason: They offer more or less sheilding from grounds of various
sources, including your own body.

Whatever cables you are using are allowing a 60 Hz hum to interfere with your enjoyment of your unit.

Since the cables have to be in close proximity with both your body and the back of the unit, which emits
a 60Hz signal, from your house wiring, which becomes the humming noise you experience, the AV cables
should be heavily sheilded so as to protect the signal from your MP3 player from interference by the 60Hz
signal to increase the signal to noise ratio and thereby reduce your hum.

So, shop for the cables with the least loss and the highest signal to noise ratio. And enjoy!

Apr 17, 2009 | Sony Playstation 3 (PS3) Console

1 Answer

Speaker noise

Logitech X-240 seems love to pickup all RF noise.
Any AM [amplitude modulation] over such RF gets into audio as another noise - some might pick up AM radio signal although won't sound clear at all with some amplifiers [I am serious] - which has high gain preamps - less shielding and unmanaged ground wire handling.

Re-engineer with shilded cable - and [I don't know how normal users will do] - make sure the docking part is not the RF picker.
Well, when your CPU is processing millions of transistors are switching, and we call that digital noise, usually systems with high SNR {signal to noise ratio} should be more immune to such.

One more thing, it could be just the audio card [be it plugged in PCI bus or in Motherboard] could be a bad one - which is picking up noise - rearrange all cables inside CPU box - and check.

Isolate the problem - if it is from CPU, and audio-card --> audio line-out amp chip is picking the noise, - unplud the card or swap with another good audio card, possibly different make/model.
If the audio is on motherboard - do disable through BIOS setup.

Dec 17, 2008 | Logitech X-240 Computer Speakers

1 Answer

Philips navigator MK8 Gps antenna is showing good but no update. Red light continualy flashes indicating wrong date and time. Can you help

Hi Johnsue05

pls. check the signal to noise ratio of the antenna signal. Sea page 23 and 24 of this manual:

If the signal to noise ratio is low, the GPS may have a bad antenna, cable connection or a defective antenna.

If you have performed a cold start (i.e. changed the backup batterie) you have to wait for 2-3 hours until der GPS has downloaded the almanach information.

Hope this helps.


Sep 11, 2008 | GPS

1 Answer

On HD-2 band

You need to make sure that the signal is strong enough. In the carrier to noise ratio you need to keep it above 55 db. Anything below that and HD will drop.

Use the SSI to determine C/N ratio and use that to aid in pointing the antenna.

Feb 08, 2008 | Sangean HDR-1 Radio

1 Answer

What is the SNR

The STAC9221 is deigned for media-centric systems such as Media Center PCs, Game Enthusiast PCs, and new classes of devices aimed to distribute music and video around the home. The STAC9221 sets the standard for high performance by providing 8-channels of true 24-bit audio with a 105dB SNRSee signal-to-noise ratio.
..... Click the link for more information.
(Signal-to-Noise Ratio). This level of performance enables theater quality 7.1 surround sound to PCs and PC-like devices that continue to move into the living room alongside or in place of traditional consumer electronics gear. The STAC9221 incorporates an ADAT(R) Lightpipe interface allowing connectivity to professional audio equipment. The STAC9220 provides 95dB SNR performance setting the standard for the high volume, mainstream desktop PC and high end notebook PCs

Hope that helps.
For more see;

Jan 15, 2008 | Computers & Internet

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