![]() This might not be considered a clinically significant amount so it might be acceptable to consider thresholds measured in dB A “as if” they were hearing levels. same reference value (0 dB HL) is used at every frequency to represent the average normal hearing sensitivity, otherwise known as the threshold of. In sound engineering, the reference level for power or voltage is often fixed at 0.775 volts RMS. The Reference Equivalent Threshold Sound Pressure Levels (RETSPLs) for sound field testing are provided in ISO 389-7, which are thresholds given under binaural listening conditions and the values it contains are the basis for defining dB HL in these conditions.Īlthough sounds measured in dB HL are therefore derived using RETSPLs and sounds measured in dB A are measured directly using an SLM, the difference between the two is nonetheless small – on the order of 3dB across most of the audiometric range. This is generally described as 0 dB and indicated as dB HL.’ d. Thus, a dBA measurement indicates decibels on the A scale, which attempts to mimic the curve of how human ears hear sound, and pertains to mid-range sound frequencies that fall within the ordinary range of human auditory perception (typically between 500 Hz and 6 kHz). This provides a measurement that has some resemblance to the 40-phon equal loudness contour, hence the measurements provided will have a closer relationship to loudness than, say, the z-weighting (or zero weighting) measures. As nouns the difference between decibel and phon is that decibel is a common measure of sound intensity that is one tenth of a bel on the logarithmic intensity scale. The sone scale is a third scale associated with the loudness of a sound. Figure 1 represents an average of the results for many individuals. In the sound field, the A-weighting for measuring sound pressure level is often applied to the sound level meter. For other frequencies, they adjusted the decibel level until it was perceived to be of equal loudness as the 1 kHz sound. It follows that the determination of the volume (loudness) which is double as loud should not be dogmatically defined. half loudness was equal to half sound pressure level (6 dB) from 45 to 90 dB. ![]() Either one or the other scale would typically be used. From these we can see that the decibel scale gives numbers in a much more manageable range. Well, I’m not really sure they’re used “interchangeably” as such. Can dB (A) and dB (HL) be used interchangeably in sound field audiometry? ![]()
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