examples of internal noise.thermal noise,short noise,i/f noise
because it helps in noise reduction,bandwidth maximization
Fluorescent light emit a small amount of electrical noise, which can be picked up by external wires if they are too close.
FM systems are far better at rejecting noise than AM systems. Noise generally is spread uniformly across the spectrum (the so-called white noise, meaning wide spectrum). The amplitude of the noise varies randomly at these frequencies. The change in amplitude can actually modulate the signal and be picked up in the AM system. As a result, AM systems are very sensitive to random noise. An example might be ignition system noise in your car. Special filters need to be installed to keep the interference out of your car radio. FM systems are inherently immune to random noise. In order for the noise to interfere, it would have to modulate the frequency somehow. But the noise is distributed uniformly in frequency and varies mostly in amplitude. As a result, there is virtually no interference picked up in the FM receiver. FM is sometimes called "static free, " referring to its superior immunity to random noise.
Noise immunity is the ability of a system to perform even when there is noise present. The higher the level of noise a system can still operate under, the higher the noise immunity.
Signal to noise ratio is a measure of signal strength to the background noise. Engineers use the signal to noise ratio to improve digital signal processing.
Example: Any external noise that occurred was blocked by the sound-proof headphones.
Noise blocking windows are effective in reducing external noise pollution inside a room by blocking out a significant amount of noise from entering the room.
Any unwanted noise is muted with the noise cancelling headphones. For example if there is a baby on the plane that is crying. The headphones will mix the noise from your music/media and the external noise and cancels out the external noises.
Noise-proof windows are effective in reducing external noise levels inside a room by blocking out a significant amount of noise from entering the room. The level of noise reduction can vary depending on the quality of the windows and the specific noise sources outside.
It is an external stimulus.
Noise-canceling headphones use a technology called active noise cancellation to reduce external noise. This technology works by using microphones to pick up external sounds and then producing sound waves that are the exact opposite to cancel out the noise. This process is based on the principle of destructive interference, where the sound waves combine to cancel each other out. By reducing external noise, noise-canceling headphones can enhance sound quality by allowing the listener to hear the audio more clearly without interference from background noise.
Noise reduction windows are effective in minimizing external sounds and creating a quieter indoor environment by blocking out a significant amount of noise from outside.
Noise reducing windows are effective in minimizing external sounds and creating a quieter indoor environment by blocking out a significant amount of noise from outside.
There are a wide range of external soundcards available.
Sound reducing windows are effective in minimizing external noise pollution in residential or commercial spaces by blocking out a significant amount of noise from entering the building.
Noise canceling headphones use neither white noise nor music. True noise canceling headphones use microphones that pick up outside sounds, amplifiers to invert those sounds, and combining circuits to combine the signal to be played with this inverted external sounds before feeding it to the speakers. The external noise vanishes by cancellation, which is why they are called "noise canceling".
The external chambers of the ancient tomb gave little indication of the magnificence of the innermost chamber.