It is difficult to recognize noise because it is perceived slightly differently by different people.
What may not be bothersome to one owner may be extremely bothersome to another, or there may be a difference in perception between the manufacturer and the owner.
The manufacturer may think it is white noise, but the owner who is actually using it may not.
It would be better if there was no noise at all, but there are some things that do appear in the data,
It is difficult.
