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Post by melikepie on Nov 22, 2017 22:27:11 GMT
I saw this on a passageway at Vauxhall tube station and wondered what it's purpose was.
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rincew1nd
Administrator
Junior Under-wizzard of quiz
Posts: 10,225
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Post by rincew1nd on Nov 23, 2017 0:31:32 GMT
I presume you mean apart from sensing the ambient noise?
It could sense a variety of things (volume, frequencies et cetera), as to what LUL do with these data - perhaps that is the question?
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Post by 100andthirty on Nov 23, 2017 7:45:55 GMT
Two purposes come to mind:
1) to monitor noise levels to help complh with a noise obligation 2) to alter the public address system volume based on the ambient nkise levels, so it can always be heard without being VERY LOUD when the area is quiet.
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class411
Operations: Normal
Posts: 2,724
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Post by class411 on Nov 23, 2017 8:13:50 GMT
I presume you mean apart from sensing the ambient noise? It could sense a variety of things (volume, frequencies et cetera), as to what LUL do with these data - perhaps that is the question? Nice.
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Post by zbang on Nov 24, 2017 5:43:37 GMT
2) to alter the public address system volume based on the ambient nkise levels, so it can always be heard without being VERY LOUD when the area is quiet. Unless the technology has greatly improved since I last tried them, they seldom bring the level back down after it's been jacked up. (Usually the time constants are far too short properly adjust to conditions.)
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Post by jamesb on Nov 26, 2017 0:19:43 GMT
At Roding Valley (possibly the quietest station on the network) they were installed during the now defunct Metronet upgrade along with a new PA system and seem to offer 'high' and 'low' outputs in response to the ambient noise levels (according to the two LEDs on them). I would suggest that they are of very limited use at Roding Valley, unless a heard of elephants appear from nowhere.
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Post by trt on Nov 26, 2017 10:32:48 GMT
"a heard of elephants"
*applause*
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