Determing Sound Pressure Levels (SPL)

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SUMMARY

The discussion focuses on determining Sound Pressure Levels (SPL) in various scenarios involving machines and noise types. It outlines calculations for SPL when a machine is operating alone, comparing measurements at 94 dB and 90 dB re 20 µPa. Additionally, it addresses the characteristics of white noise and pink noise, demonstrating that SPLs in successive 1/N octave bands increase by approximately 3/N dB for white noise and remain independent of frequency for pink noise. The forum emphasizes the importance of user engagement in problem-solving.

PREREQUISITES
  • Understanding of Sound Pressure Level (SPL) calculations
  • Familiarity with white noise and pink noise concepts
  • Knowledge of octave band analysis
  • Basic acoustics principles
NEXT STEPS
  • Research Sound Pressure Level calculations using dB re 20 µPa
  • Explore the properties of white noise and its spectral density
  • Investigate pink noise characteristics and their applications in acoustics
  • Learn about octave band analysis and its significance in sound measurement
USEFUL FOR

Acoustic engineers, sound technicians, and students studying noise control and sound measurement techniques will benefit from this discussion.

yemmdizzle006
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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.
 
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Hi yemmdizzle006, welcome to PF!:smile:

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?
 

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