Delayed correlated sources produce frequency-dependent comb filtering

Evidence

Changing the position at which the pressure variation is observed will change the time relationships between the waves being combined. Therefore, the composite result from correlated sources is dependent on position. It will also depend on frequency because the effective phase shift caused by a time delay is proportional to frequency. — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 241 (#expands, via linked claim)

Categorization

Category: Causal Relationships

Related

• Interference pattern of correlated sources varies with both listener position and frequency (similarity 0.84)
• Two correlated sources combine constructively or destructively depending on frequency (similarity 0.83)
• Frequency response varies wildly across a hall yet listeners barely notice (similarity 0.82)
• MDI interference peaks when target and interferer share symmetric offsets. (similarity 0.82)
• Coincident delayed sounds are far harder to detect than spatially separated ones (similarity 0.81)
• Path-length differences between correlated sources create spatial interference zones with silent spots. (similarity 0.81)
• Late-arriving room sound becomes omnidirectional and uniformly distributed (similarity 0.80)
• Steady-state comb-filter measurements fail to represent how transient sounds are heard (similarity 0.79)
• Sound is localized to the first arriving acoustic source despite delayed reinforcement (similarity 0.79)
• Delayed sounds arriving from different angles are perceived as spaciousness, not comb filtering (similarity 0.79)
• Time-delayed sound self-addition imposes spectral notches via autocorrelation (similarity 0.79)
• The null of the phantom-center comb filter makes the sweet spot findable by ear (similarity 0.79)
• Correlated sound sources create spatial interference patterns that uncorrelated sources do not. (similarity 0.79)
• Time-delayed reflections impose periodic comb filters of enhanced and suppressed frequencies (similarity 0.79)
• Uncorrelated source totals ignore the relative phases of signals. (similarity 0.79)

Broader Connections

• Interference pattern of correlated sources varies with both listener position and frequency #expands (0.80) — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 241
• Surface wall mounting creates a comb-filter cancellation at the woofer-to-wall round-trip wavelength #exemplifies (0.80)
• Steady-state comb-filter measurements fail to represent how transient sounds are heard #expands (0.75)
• A 30-40 ms delay separates fusion from echo in the precedence effect #qualifies (0.75)