14-12-2012, 12:34 PM
PROJECT REPORT ON NOISE LEVEL METER
NOISE LEVEL METER.doc (Size: 263.5 KB / Downloads: 32)
Introduction:
A Noise level meter or sound meter is an instrument which measures sound pressure level, commonly used in noise pollution studies for the quantification of different kinds noise, especially for industrial, environmental and aircraft noise. However, the reading from a sound level meter does not correlate well to human-perceived loudness, which is better measured by a loudness meter.
WORKING:
As shown in the above diagram this project is divided into two parts one is transmitter & another is receiver audio signal generated at mic that analog signal is transferred to the audio amp. So additional strength will get added into analog signal
Then that analog signal is further transferred to the analog to digital convertor here analog signal get converted into the digital signal then it is transferred towards the microcontroller then through this microcontroller signal is transmitted via Radio frequency here we are using 433 MHz frequency for the communication
Now on the receiver side, Radio frequency receiver will receive this signal and transferred towards the microcontroller here microcontroller will measure the signal
And check that it lies within the pre defined limit or not. If it is excess then it will display the measure and alarmed and if it is not excess then it will display the measure