this is why you see a fuzzy cover over microphones. it filters the background noise making a clearer sound. However the quality of the microphone is usually the reason why your video sound sucks. your surroundings geography has A small impact also
No.
The design of the engine intake and exhaust can do a lot to reduce noise levels.
I "think" there are two types.Seeing video noise (that is visual video noise) and hearing video noise. I assume you are not interested in the audio issue (although there are software to help remove background noise in a video).For the visual video noise I believe it is a shimmery look e.g a uniform colored surface (such as a wall) which looks not solid, but "shimmery." Or picture looking shimmery.Examples are here:http://www.neatvideo.com/examples.html
noise reducing from signal by some method?
yes
noise insullation in walls help to reduce the noise and also triple glazing
noting
they are made of egg foam which muffles noise
thermal noise willbe reduce
To reduce the noise of chatter at hotels, someone could ask the owner of the hostel to speak to the people making the noise. Also, the person who doesn't like the noise could buy some headphones or earplugs to limit the noise they hear.
noise insullation in walls help to reduce the noise and also triple glazing
its to reduce noise