Deriving the Real-Ear SPL of Audiometric Data Using the “Coupler to Dial Difference” and the “Real Ear to Coupler Difference”

Abstract

The CDD measured for an individual audiometer and the RECD measured for an individual ear can be used to derive a valid estimate of real-ear SPL when it has not been possible to measure this directly.

The Influence of RECD Transducer When Deriving Real-Ear Sound Pressure Level

“…There is good agreement between the mean ER-3A insert earphone RECDs measured in the present study and those reported previously (for example, Munro & Davis, 2003;Munro & Hatton, 2000;Munro & Toal, 2005).…”

Comparison of Psychophysical and Physical Measurements of Real Ear to Coupler Differences

“…, the test-retest reliability was very high, and no session effect was obtained. The test-retest reliability is in good agreement with the literature (Scollie et al 1998;Munro & Davis 2003;Munro & Millward 2006). The standard deviation is greater than 1 dB at lower and higher frequencies most probably due to the problem of air leakage at low frequencies and standing waves at high frequencies.…”

“…5,[543][544][545][546][547][548][549] For the RECD curve determined with the HA1 2-cc coupler, we found no statistically significant difference with the literature (Sachs & Burkhard 1972;Munro & Davis 2003;Dillon 2012). For the HA2 2-cc coupler, there was no difference in RECD values reported by Munro and Davis (2003) and Sachs and Burkhard (1972). However, there were statistically significant differences at 3000 Hz and 4000 Hz in comparison with Dillon (2012) (p < 0.001).…”

“…Figure 3 shows the comparison for the HA1 2-cc coupler (left) and the HA2 2-cc coupler (right). The solid black line with diamonds represents the physical RECD curve in this study while the dashed line with circles, gray solid line marked with triangles, and solid gray line marked with crosses represent the data reported by Sachs and Burkhard (1972), Dillon (2012), and Munro and Davis (2003), respectively. …”

“…For example, Bagatto et al (2002) showed that the variation in RECD can decrease by approximately 10 dB at 4000 Hz between an infant of 1 month and 2 years old. It was shown that the real ear SPL in a subject could be predicted accurately for different types of stimuli when the RECD was measured for the respective subject (Moodie et al 1994;Scollie et al 1998;Munro & Davis 2003). In addition, the earmold configuration affects the RECD (Munro & Buttfield 2005).…”