PPRuNe Forums - AMBIENT NOISE SENSOR

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Danial9874

10th Jul 2020 09:41

AMBIENT NOISE SENSOR

Helo

B737 uses low pressure switch to increase pax cabin speaker approx 6dBs when engine is running
Is there any aircraft that use Ambient noise sensor to automatically increase sound level of cabin speaker ?

thank you

lochias

10th Jul 2020 10:50

Normally there is a logic behind automatic gain in PA system and it involves engine running input, all doors closed etc.

see 737 schematic interface below engine running relays
https://cimg4.ibsrv.net/gimg/pprune....d146527c60.jpg

greatwhitehunter

13th Jul 2020 18:18

ANS system

The B777 uses ambient noise sensors in the cabin. They monitor the local sound level and filter the noise and signal to compute the signal to noise ratio. The result is used by the system to control the PA level in that zone. If memory serves there are 5 PA zones. This is in addition to the normal discrete inputs mentioned above which increase PA level for engines on, A/C speed, decompression etc. The cabin crew can turn the ANS system off if it becomes troublesome, (and it does).

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