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Hearing levels are measured with pure tones at different frequencies and the hearing level of an individual will vary depending on the frequency chosen. dB HL (hearing level) is not the same as dB SPL (sound pressure level), which is an absolute measure of the pressure generated by sound wave. level 2. Statistically speaking, 15 dB HL is a conservative cutoff for normal variance around the mean of 0 dB HL for normal hearing and higher would be considered statistically significant by most statistical designs. Therefore, pure tone audiometry testing usually concentrates on the frequencies represented in male and female human voices, namely 250 – 8000 Hz. dB SPL is a comparison of a sound level to what was thought to be the threshold of hearing, although today it is known that the value was too high. Severe: between 71 and 90 dB HL. Original Poster 2 years ago. Moderately severe: between 55 and 70 dB HL. The value of a dB depends on the context in which it is used. 10 db HL would be 10 dB SPL lower and so on. Physically, every 6 dB increase represents a doubling of sound pressure level. (Okay, just kidding.) Report Save. So 0 dB HL would be the minimum treashold of hearing for an average healthy male adult. Hearing Level (HL) dB HL is used to refer to the hearing ability of a person and gives a statement about the severity of the hearing loss. Moreover, dB allows a realistic modelling of human auditory perception, since the ear reacts to relative changes in noise level. But soft sounds are hard to hear such as the voice of baby. Thresholds are measured on a decibel (dB) hearing loss (HL) scale referenced to audiometric"zero" (the average hearing level at each frequency for normal young adults). Profound: 91 dB HL or greater. Mild hearing loss You may hear the conversation or the speech. dB HL dB hearing level is used in audiograms as a measure of hearing loss. [citation needed] dB Q The reference level varies with frequency according to a minimum audibility curve as defined in ANSI and other standards, such that the resulting audiogram shows deviation from what is regarded as 'normal' hearing. dB SPL is a comparison of a sound level to what was once believed to be the threshold of hearing, although today it is known that the value was too high. dbA at 0 phon is exactly this. Moderate: between 41 and 54 dB HL. One traditional PTA measure is the speech frequency average of thresholds at 500, 1000, and 2000 hertz (Hz). Also, the opposite, someone with thresholds at < -15 dB HL should be recognized for super hearing! The decibel (dB, or dB HL) is a logrithmic scale. In many cases, dBs are followed by a suffix to define a reference variable. I hope this helps :) 3. share. dB HL is determined by conducting hearing tests among a large test group to determine the "equal loudness curve" and … Perceptually, every 10 dB increase sounds twice as loud. -5 dB HL would be 5 dB SPL higher than average. Speech sound components can be represented from 125-8000 Hz depending on the speaker. 0 dB HL is what normal hearing is defined as. dB HL and dB SPL. The threshold of hearing is plotted relative to a standardised curve that represents 'normal' hearing, in dB(HL). An audiogram is a graph that shows the audible threshold for standardized frequencies as measured by an audiometer.The Y axis represents intensity measured in decibels and the X axis represents frequency measured in hertz. It's measured with pure steady tones, same as dbHL. Totally Deaf: Have no hearing at all. The number of select frequencies tested can vary upon the age of the person tested, the reason for the test, and the time allotted for testing. 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