Decibels
Decibels - Related Videos
09:44
Neuro-rehabilitation Approach for Sudden Sensorineural Hearing Loss
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Cited by 10 •
2016
This article reports the development of a neuro-rehabilitation approach, "constraint-induced sound therapy (CIST)" for sudden sensorineural hearing loss. The aim of CIST is to prevent maladaptive cortical reorganization by using an enriched acoustic environment. CIST represents a safe, easy, inexpensive, and effective approach to treat sudden sensorineural hearing loss.
08:38
Habituation and Prepulse Inhibition of Acoustic Startle in Rodents
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Cited by 164 •
2011
Habituation and prepulse inhibition of startle are operational measures of sensory gating. Sensory gating is disrupted in schizophrenia, and some other mental disorders and neurodegenerative diseases. We here describe a standard protocol to assess short-term and long-term habituation as well as prepulse inhibition of acoustic startle responses in rats and mice.
09:27
A Method for Systematic Electrochemical and Electrophysiological Evaluation of Neural Recording Electrodes
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Cited by 9 •
2014
Different electrode coatings affect neural recording performance through changes to electrochemical, chemical and mechanical properties. Comparison of electrodes in vitro is relatively simple, however comparison of in vivo response is typically complicated by variations in electrode/neuron distance and between animals. This article provides a robust method to compare neural recording electrodes.
02:22
Measuring the Auditory Brainstem Response in Mice
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2025
Source: Lee, D., et. al. Modified Experimental Conditions for Noise-Induced Hearing Loss in Mice and Assessment of Hearing Function and Outer Hair Cell Damage. J. Vis. Exp. (2023)This video demonstrates the measurement of auditory brainstem response (ABR) in a mouse. Electrodes are placed on the head, behind the ear, and near the tail of an anesthetized mouse. Acoustic stimuli at various intensities are delivered, and electric signals generated are recorded as waveforms.
05:37
Proper Personal Protective Equipment
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2023
Robert M. Rioux & William A Elliott, Pennsylvania State University, University Park, PA Hazards are many and varied in the laboratory, but the right choice of PPE can make the laboratory a safe place to work.
FAQs
A decibel value describes a comparison, so the measured quantity must be paired with a specified reference. Changing that reference changes the resulting numerical level even when the measurement itself stays the same. This makes the reference important for interpreting sound, signal, gain, loss, and attenuation values consistently across mathematical and experimental analyses.
The multiplier depends on the type of quantity being compared. Power ratios use 10 times the base-10 logarithm, whereas amplitude ratios use 20 times the logarithm when conditions such as impedance remain consistent. Applying the appropriate expression prevents a power comparison from being treated as an amplitude comparison and preserves the intended mathematical relationship.
A logarithmic scale compresses very large ratios into more manageable numerical differences. Instead of representing every change directly on a linear scale, it expresses how the measured quantity compares with a reference through powers of ten. This makes broad dynamic ranges easier to organize, compare, and analyze in mathematical studies of sound and signals.
First identify the measured quantity and its reference, then form their ratio. For power, take the base-10 logarithm of that ratio and multiply by 10. For amplitude, use the logarithm multiplied by 20 when consistent impedance conditions apply. Selecting the correct quantity and formula determines whether the result represents power or amplitude.
Impedance conditions determine whether an amplitude ratio can be converted with the 20-times logarithmic expression. That expression is appropriate when the relevant impedance remains consistent, because the relationship between amplitude and power depends on that condition. In electronics and telecommunications, checking this condition helps ensure that a calculated level, gain, or loss has the intended meaning.
In acoustics, decibel calculations help compare sound-related levels and intensity ratios. Electronics uses them to describe signal gain or loss, while telecommunications applies them to signal attenuation and level changes. Across these fields, the values support analysis of dynamic range and make relative changes easier to distinguish than they would be on a direct linear scale.