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. 1996 Dec;1(4):121-35.
doi: 10.1177/108471389600100402.

Real-ear measurement of hearing threshold and loudness

L E Humes  1 , C Pavlovic  1 , V Bray  1 , M Barr  1
Affiliations

Real-ear measurement of hearing threshold and loudness

L E Humes et al. Trends Amplif. 1996 Dec.
No abstract available

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Figures

Figure 1.
Figure 1.
Schematic illustration of the arrangement of the equipment used in the RELM prototype system.
Figure 2.
Figure 2.
Mean test (filled symbols) and retest (unfilled symbols) data for the RELM loudness ratings from 35 normal-hearing adults. Mean threshold values for test (triangles) and retest (squares), measured with clinical procedures and equipment for 20 of the 35 subjects, are shown as unfilled, unconnected symbols near the bottom of the figure.
Figure 3.
Figure 3.
Mean standard deviations (unfilled bars) and 5th–95th percentile ranges (striped bars) for the signed test-retest differences for the RELM loudness ratings.
Figure 4.
Figure 4.
Comparison of adjusted RELM loudness contours (symbols connected by dotted lines) to adjusted equal-loudness contours in phons from Robinson and Dadson (1956). See text for a description of the various adjustments required to enable this comparison.
Figure 5.
Figure 5.
Mean test (filled symbols) and retest (unfilled symbols) 1/3-octave levels for the speech noise presented at levels fo 50, 65 and 80 dB SPL.
Figure 6.
Figure 6.
Mean standard deviations (unfilled bars) and 5th–95th percentile ranges (striped bars) for the signed test-retest differences for the RELM speech-noise measurements averaged across the 65 and 80 dB presentation levels.
Figure 7.
Figure 7.
Comparison of RELM speech-noise 1/3-octave levels (unfilled symbols) to the targeted 1/3-octave levels (solid lines) from the pending ANSI standard on the Speech Intelligibility Index (SII). All dB values are in sound-field SPL.
Figure 8.
Figure 8.
Overlay of the three speech-noise contours at 50, 65 and 80 dB from Figure 5 (retest values) on top of the RELM loudness contours from Figure 2 (test values). The unfilled circles at the higher frequencies for the 50-dB speech noise represent estimates of the true speech spectrum unaffected by the noise floor. These values were estimated from the differences between measured and targeted 1/3-octave levels for the 50-dB speech noise at the frequencies (observed previously in Figure 7).
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References

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