Post by class411 on Apr 6, 2022 15:42:45 GMT
Hmm so that seems roughly similar to the sound level you might encounter operating a typical electric drill without any ear defenders.?
Having commuted for decades I have no doubt the noise is loud but you do not state what "device" or "approved software" you are using to assess the decibels. As this link explains..
There are no android apps which have been certified as accurate, and only a couple of costly iphone apps which have been tested to deliver reasonably accurate noise level assessments.
Likewise it would be interesting to know where and why the operator chose to take their video from. I can easily locate several places where there are high sound levels in my VW car if I was to place my iphone right beside the rubber door seal. However if I moved the phone just a few inches away from the door seal then the monitored noise level is substantially lower. Likewise sound levels can be massively higher if the windows are open rather than closed.
Another factor to consider is that the generally poor quality of audio pickups installed in most mobile phones which means that many videos produce rather misleading audio especially when compared with real life.
This has been remarked upon in several railway related youtube videos. For instance the early videos of the Class 230 battery demonstrator suggested the unit was producing an almost unbearable unpleasant high pitched whining noise as it accellerated, however this was not just observed with my own ears.
I suspect that most regular commuters already know the places where their route is noisy, and they probably do not go out of their way to stick their ear right beside the door seal. Indeed many seem largely isolated from the planet, often wearing noise cancelling headphones whilst immersed in a movie on their mobile device. My guess is that most commuters actually choose to sit or stand well clear of the doors and areas where the most extreme noise levels are present.
Whenever. I travel on the Victoria line, North of Kings Cross, there are passengers ramming their hands against their ears to defend themselves against the appalling noise. No phones or properly calibrated audiometers are required to note the extreme sound levels.