While rectification pulsations are caused due to ac not being converted to dc perfectly. This causes hum (low frequency humming noise). To smooth these pulsations filters are used. Noise is an unwanted signal in the communication system.
Terrestrial noise is noise that originates on the earth. Extra terrestrial noise comes from space.
The spiral shape lessens wind noise created by typical cylindrical shaped antennas masts. It is there for passenger compartment noise reduction only, and has nothing to do with the noise or clarity of the radio signal it receives.
All satellite radios will have equal reception as they meet a common wireless specification.
Humbuckers are called "Hum"-"buckers" for a reason- they are two single coils wired to achieve noise phase-cancelation. Single coils do not have this feature, but if you notice that if you have a 5-way selector switch and you use your KNECK and MIDDLE singlecoils on a Stratocaster (assuming you have a 3 singlecoil setup) or a MIDDLE and BRIDGE, there is no hum, because of this sample principle.
If you mean FM/AM radio: Radio reception is based off the bouncing of radio waves off of the upper atmospohere and ionosphere. But in the daylight, the sun causes molecular turbulence in those layers like photodissociation and infrared absorption. Imagine trying to look in a liquid mirror that has a lot of turbulence vs one that is rather stagnant. Sunlight makes the "mirror" of the upper atmosphere and ionosphere turbulent while in comparison the night sky is a more stagnant "mirror" Particularly, radio stations switch to low power mode some point after dark because of the substantial increase in transmission-reception ability. ---- If you mean radio astronomy: Your question is better stated, "why does the signal-to-noise ratio improve after sunset" where "improve" means "increase". Though it is not as dramatic as the visible or infrared emissions, the sun is a strong radio source. As a result, if we are looking for radio signals that are not the sun, then the sun is considered to be part of the background noise. Then after sunset, this noise source is propagating through the earth and not directly into the radio telescopes. As a result, the amplitude or level of noise has decreased and the signal has remained mostly the same and thus the signal-to-noise has increased by dividing by a smaller noise. signal-to-noise is literally "signal divided by noise".
Hum
From the radio manufacturer.
You need to check the front wheel bearings, while driveing down the road stright turn the steering to the left and then to the right and listen to see if the hum noise changes, if not then both bearings are bad left and right sides. If the hum noise changes while turning to the left then right front bearings are bad , if hum noise changes while weaven to the right then left bearings are bad.
What kind of noise? Hum/click/rattle/knock/squeal?
my definition is to make a small, tuneful noise that does not include words and is not a hum.
The noise made by kuriboh can be described as a short high hum
This thing about its supposed "great noise and hum removal capabilities thanks to its "noise profile selection" is a TOTAL disappointment. Been trying to correct a recording with too much hum for many weeks and I'm still right at the starting point. Is there a decent program out there for this, BUT Audacity?
radio lol
Check all of the wiring connections. If the hum persists the rheostat can be replaced with a low rf emitting dimmer.
The sound of a fan running is typically a steady hum or whirring noise.
Noise is common from any engine, the TYPE of noise is what you should worry about. Is it a knocking noise? hum? squeak? rattle?
A noise reducer pedal helps to reduce unwanted background noise and hum in a guitar setup, resulting in a cleaner and clearer sound.