We can indicate this graphically by the second horizontal axis. In this example, a score of 50% is achieved at a presentation level of 23 dB SPL.īy analogy with audiometry, here too we can define 0 dB HL as the presentation level at which 50% of the responses are correct, in this case, 0 dB HL = 23 dB SPL. In any case, the score on a speech list will improve as the presentation intensity increases, which is expressed by the typically sigmoidal norm curve.Įach speech list has its normal curve. Some speech lists compensate slightly for these differences, to avoid the subjective loudness having too great an influence on the score. So if a word contains mainly frequencies around 2000 Hz, 60 dB SPL will sound louder than for a word with mainly low frequencies. This is because the ear's sensitivity to different frequencies is different. However, two words with the same intensity are not necessarily perceived by the ear as being equally loud. The sound level is measured with a sonometer and expressed in dB SPL. In principle, dB SPL is the correct physical scale. The presentation level of speech stimuli is sometimes expressed in dB SPL, sometimes in dB HL. Modified on: Wed, 21 Sep, 2022 at 8:47 AM Solution home Audiqueen FAQ Should I use dB HL for speech audiometry?
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