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Most rail/underground station public announcement systems suffer from the problem of not being able to rise above the abient noise level. The announcer has no way of knowing how noisy the environment surrounding the loudspeaker is in order to adjust the volume accordingly. These loudspeakers should be incorporated with a microphone which measures the level of ambient noise, and automatically adjusts the volume accordingly.


 by by David at 02 Feb 2006 23:00:12
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