I go 4 fingers down from the collar on the front, and just under the front collar impression on the backside of the shirt. everyones fingers are different so I measured mine and the 4 fingers measure 3.5. I also use my left hand to guage where to put left chest logos.
Grey noise then, has a sound frequency that, if translated to a light frequency, would roughly be the color grey. Grey noise is a random sound that is distinguishable from other types of sound because it sounds the same, to the human ear, at all frequencies.
Definition of 'background noise'. Word Frequency. background noise (ËbÃ¦kËÉ¡raÊnd nÉÉªz) noun. any type of noise that is not the sound that you are specifically listening to or monitoring. The recording wasn't very good, there was too much background noise. We're picking up a lot of background noise which makes it difficult to hear what they're saying.