Javascript must be enabled to continue!
Why can a decrease in dB(A) produce an increase in loudness?
View through CrossRef
Loudness measured by the method of absolute magnitude estimation is compared to loudness calculated in accordance with ISO 532 B [International Organization for Standardization, Geneva, 1966]. The measured and calculated loudness functions exhibit a similar pattern of loudness growth. Both measured and calculated loudness of a complex sound composed of a 1000-Hz tone and broadband noise is a nonmonotonic function of the overall SPL of the complex. The nonmonotonic loudness-growth pattern holds over a 30-dB range from 73.5 to 103.5. To facilitate understanding of the results, a single cycle of data is analyzed in detail. The analysis shows that loudness patterns produced in the auditory system by the tone–noise complex can account for the observed effects. Moreover, they show that the A-weighting and the loudness of the complex are negatively related. This inverse relation means that the A-weighted SPL is an inappropriate and misleading indicator of the loudness of sound combinations with heterogeneous spectral envelopes. Consequently, its suitability for noise control is diminished. A loudness meter that combines the spectral shapes of different sounds to produce an overall perceived magnitude offers greater promise.
Acoustical Society of America (ASA)
Title: Why can a decrease in dB(A) produce an increase in loudness?
Description:
Loudness measured by the method of absolute magnitude estimation is compared to loudness calculated in accordance with ISO 532 B [International Organization for Standardization, Geneva, 1966].
The measured and calculated loudness functions exhibit a similar pattern of loudness growth.
Both measured and calculated loudness of a complex sound composed of a 1000-Hz tone and broadband noise is a nonmonotonic function of the overall SPL of the complex.
The nonmonotonic loudness-growth pattern holds over a 30-dB range from 73.
5 to 103.
5.
To facilitate understanding of the results, a single cycle of data is analyzed in detail.
The analysis shows that loudness patterns produced in the auditory system by the tone–noise complex can account for the observed effects.
Moreover, they show that the A-weighting and the loudness of the complex are negatively related.
This inverse relation means that the A-weighted SPL is an inappropriate and misleading indicator of the loudness of sound combinations with heterogeneous spectral envelopes.
Consequently, its suitability for noise control is diminished.
A loudness meter that combines the spectral shapes of different sounds to produce an overall perceived magnitude offers greater promise.
Related Results
Comparison of A-weighted sound pressure level (dB(A)), loudness-level weighted sound pressure level (dB(EQL)), and loudness with respect to environmental noise assessment.
Comparison of A-weighted sound pressure level (dB(A)), loudness-level weighted sound pressure level (dB(EQL)), and loudness with respect to environmental noise assessment.
A pair of related tools useful for environmental noise assessment are time-varying psychoacoustic loudness, and an expression of sound pressure level in dB[SPL] weighted dynamicall...
Modeling transmission dynamics and control of anthrax
Modeling transmission dynamics and control of anthrax
Anthrax is a zoonotic disease caused by Bacillus anthraces. In this study the deterministic mathematical models for transmission dynamics of anthrax in absence and presence of cont...
Abstract POSTER-BIOL-1314: Investigating fatty acid beta-oxidation in ovarian cancer cells
Abstract POSTER-BIOL-1314: Investigating fatty acid beta-oxidation in ovarian cancer cells
Abstract
Purpose: To investigate the contribution of fatty acid beta-oxidation to the total energy budget of ovarian cancer cells.
Experimental proced...
Effect of coupling agent as integral blend additive on silicone rubber sealant
Effect of coupling agent as integral blend additive on silicone rubber sealant
AbstractSilane coupling agent (SCA) plays an important role in the improvement of adhesive properties of the silicone rubber (SR) sealant. In this study, three trifunctional silane...
Does Abstract Mindset Decrease or Increase Deception?
Does Abstract Mindset Decrease or Increase Deception?
Abstract. Past research produced mixed results regarding the effect of abstract/concrete mindset on the moral judgment of hypothetical scenarios. I argued that an abstract mindset ...
The Effect of Export on R&D Cost Behavior: Evidence from Korea
The Effect of Export on R&D Cost Behavior: Evidence from Korea
Purpose - This research intends to find out whether R&D cost stickiness shows differentiated aspects depending on exports in Korea. A cost behavior that indicates a lower rate ...
The asynergies of disaster risk reduction measures in Afghanistan
The asynergies of disaster risk reduction measures in Afghanistan
<p>Many countries face the risk of multiple hazards. The UNDRR&#8217;s Global Platform for Disaster Risk Reduction have called upon the science community for ...
Pentachlorophenol degradation by Pseudomonas fluorescens
Pentachlorophenol degradation by Pseudomonas fluorescens
Fluorescent Pseudomonads strains were considered as plant growth promoting bacteria. They exhibited antagonistic activities against phytopathogens and showed bio-fertilizing proper...
Recent Results
Native Species, Human Communities and Cultural Relationships
Native Species, Human Communities and Cultural Relationships
Species are ordinarily conceived of as being native or non-native to either a geographical location or an ecological community. I submit that species may also be native or non-nati...
Thoughts on submarine structural acoustics
Thoughts on submarine structural acoustics
The simplest submarine model is a uniform circularly cylindrical shell with flat end caps. This is too simple to be useful, but the recent phenomenal advances in computational stru...
Productivity among older people in The Netherlands: variations by gender and the socio-spatial context in 2002–03
Productivity among older people in The Netherlands: variations by gender and the socio-spatial context in 2002–03
Productivity among older adults manifests in engagement in paid work, voluntary work, giving support to others, home maintenance and housekeeping. This paper reports an investigati...
Unmounted Plexiglas trial proof for "The Moment" (fragment)
Unmounted Plexiglas trial proof for "The Moment" (fragment)
Fragment of an unmounted Plexiglas trial proof for "The Moment," in blue, with dark blue bands to left and right of a central light blue band. Multiple Barnett Newman signatures ar...