Loudness Measurement
Loudness Measurement - Related Videos
01:21
Perceiving Loudness, Pitch, and Location
0 Views •
2024
The human brain perceives pitch through two primary mechanisms reflected in place theory and frequency theory. Each mechanism describes how sound waves are interpreted as specific pitches by the brain, offering insights into the intricate processes of auditory perception. Place theory, or place coding, suggests that different pitches are heard because various sound waves activate specific locations along the cochlea's basilar membrane. The brain determines the pitch of a sound by identifying...
08:53
The Measurement of Unsteady Surface Pressure Using a Remote Microphone Probe
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Cited by 11 •
2016
Here, we present a protocol to measure, with high spatial resolution, the unsteady surface pressure in turbulent flows. This method demonstrates the construction of a remote microphone probe (RMP) and the determination of its frequency-dependent, complex transfer function. An analytical determination of the dynamic response is presented and validated.
06:44
Measuring Verbal Working Memory Span
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2023
Source: Laboratory of Jonathan Flombaum—Johns Hopkins University Why is it relatively hard to remember everything on a shopping list if it includes more than just a handful of items? Why is it possible to remember a phone number that one just heard, but not two or three phone numbers at once? Why is it difficult to remember names when several new people are introduced at the same time? The answer has to do with the fact that over short-durations people rely on a specialized memory system...
07:22
Standardized Method for Measuring Collection Efficiency from Wipe-sampling of Trace Explosives
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Cited by 7 •
2017
Optimized sampling protocols and the development of new wipe materials can be facilitated by standardized measurements of collection efficiency from wipe-sampling. Our approach for sampling trace explosives uses an automated device to control speed, force, and distance during wipe-sampling followed by extraction of collected explosives.
09:43
Measuring Reaction Time and Donders' Method of Subtraction
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2023
Source: Laboratory of Jonathan Flombaum—Johns Hopkins University The ambition of experimental psychology is to characterize the mental events that support the human ability to solve problems, perceive the world, and turn thoughts into words and sentences. But people cannot see or feel those mental events; they cannot be weighed, combined in test tubes, or grown in a dish. Wanting to study mental life, nonetheless, Franciscus Donders, a Dutch ophthalmologist in the early 1800s, came up with a...
FAQs
Sound pressure level describes a physical property of a sound, but it does not fully predict how strongly a listener will perceive that sound. Perceived loudness can change with frequency, duration, and hearing sensitivity even when the measured level remains similar. Loudness Measurement therefore combines physical measurements with approaches that account for auditory response.
Frequency-weighting filters modify an instrument’s response to approximate how the ear reacts to different frequencies. This helps measurements represent auditory sensitivity more closely than an unadjusted sound pressure reading. The resulting value remains instrument-based rather than a complete account of perception, but it is useful for noise assessment and comparisons involving human hearing.
Equal-loudness contours compare sounds at different frequencies that listeners judge to have the same perceived loudness. They show that equal physical sound levels do not necessarily produce equal auditory experiences. In physics and hearing research, these contours provide a psychoacoustic basis for relating measurable sound properties to the listener’s frequency-dependent sensitivity.
A basic workflow begins by measuring the sound pressure level and then considering the conditions that can alter perception, including frequency, duration, and hearing sensitivity. Instruments may apply frequency-weighting filters, while psychoacoustic testing can compare sounds through equal-loudness judgments. Together, these steps connect an objective measurement with a perceptual assessment.
Loudness Measurement supports noise assessment, audio engineering, and environmental monitoring. It can help characterize sound in workplaces and public spaces, while audio engineers use perceptual information when evaluating or designing sound systems. Because the approach considers both physical sound and hearing response, it is also relevant to developing safer standards for environments exposed to noise.
The method helps distinguish sound intensity as a measurable physical quantity from loudness as a subjective auditory experience. That distinction allows researchers and standards designers to interpret sound levels in relation to hearing sensitivity rather than relying only on raw measurements. The resulting context supports safer workplace and public-space guidance, as well as hearing research.