Determing Sound Pressure Levels (SPL)

[yemmdizzle006]

1a.

Determine the Sound Pressure level at a point due to a machine running alone if the measurements at the point with the machine 'on' and 'off' are 94 dB and 90 dB re 20 uPa respectivele

b)

Consider white noise where P(f) = A for f >= 0. Show that the SPL's corresponding to successive 1/N octave bands increase as approximately 3/N dB

c)

Consider pink noise where P(f) = A for f >= 0. Show that the SPL's corresponding to successive 1/N octave bands are independent of frequency.

d)
Assume an SPL1 in dB re 20 uPa for a sngle machine, determine the SPLn in dB re 1uPa if N identical machines are operating.

 

[gabbagabbahey]

Hi yemmdizzle006, welcome to PF!

As per forum rules (which you agreed to when you signed up for your account), you need to show some attempt to receive assistance here. We are not going to do your homework for you.

So, what have you tried?