Sound power and intensity levels are unaffected by source correlation, unlike pressure level

Evidence

For the SWL and SIL, because we are adding powers, the results will be the same whether the sources are correlated or not. However, for SPL, there will be a difference between the correlated and uncorrelated results. — David Howard, Jamie Angus, coustics and Psychoacoustics, 258

Categorization

Category: Causal Relationships

• DEFINE: Distinguishes SPL from SWL and SIL on the dimension of source correlation, a foundational conceptual distinction.

Related

• SIL and SPL always change in proportion even where their absolute values differ (similarity 0.86)
• Correlated sound sources add pressures while uncorrelated ones add energy (similarity 0.85)
• Sound power level measures a source independent of surrounding acoustic context (similarity 0.85)
• Uncorrelated source totals ignore the relative phases of signals. (similarity 0.84)
• Intermediate separations cause loudness to follow intensity addition instead of pressure addition. (similarity 0.84)
• Correlated sound sources sum to between zero and twice their individual amplitudes (similarity 0.83)
• Correlated sound sources combine by direct pressure addition (similarity 0.83)
• Sound pressure level and intensity level coincide only without reflecting surfaces (similarity 0.83)
• Adding sound levels differs depending on whether sources are correlated or not. (similarity 0.83)
• Sound pressure level is the standard because it matches hearing (similarity 0.82)
• Uncorrelated sound waves sum by power, not by amplitude. (similarity 0.82)
• Correlated sound sources create spatial interference patterns that uncorrelated sources do not. (similarity 0.82)
• Adding uncorrelated sound sources raises level as the square root of their number (similarity 0.82)
• Loudness grows as a power law of intensity, not linearly. (similarity 0.81)
• Correlated source summation swings from zero to twice amplitude by frequency (similarity 0.80)