Generally noise is disturbing form of voice. Measurements of noise are in decibels (db). Which is from the original unit Bell (Bel). The unit can also be demonstrated in the form of a logarithm. But practically it is shown by the db. 1 db = 1/10 Bel
Different levels of noise measurement is performed using a Sound Pressure Level (SPL). Sound pressure levels are defined by mathematical formulas of the following: 𝑃 𝑃 )2 = 20 log( ) 𝑃 𝑟𝑒𝑓 𝑃 𝑟𝑒𝑓 𝑃 dB or 20 µPa 0.00002
SPL = 10 log( SPL = 20 log
Where,
P is the pressure waves of sound
Pref is a reference amount (referred to) pressure, which is 2 x 10 ^ (- 5) Pa (20 μPa). Reference is made to push the frequency of 1000 Hz, corresponding to the pressure of the clear sound of Malta.
L is the sound pressure level which corresponds to that level.
Scale of sound is approximately from 0 db to 140 db. The amount of the different status levels are as follows: Different situations
during the night Generally during the day
Noise Level (db) 40 to 50 decibels 50 to 60 decibels
for light traffic for heavy traffic
70 decibels 80 decibels
for loud trumpet horn
120 decibel
This level of noise becomes less hearing it exceeds 140 decibels and Induced hearing loss, and pain in the ear.
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signature has become game changer. Hard embedded DSP algorithms require strong seek and filter. capability and yet, the noise still creeps into final audio.
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the Fourier frequency domain. Results show improved performance for noise reduction in an easily pipelined system. Index Termsâ Noise Measurement, Video ...
