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Appendix E 209
SPL Conversions
The Target IG is converted to the Target SPL in the following steps.
1. Add the source level for aided curve 2.
2. Interpolate from 10 frequency to 80 frequency curve frame.
3. Add the AVG unaided ear response REUR in Table 1.
4. If aided 2 is composite, subtract 10.7 dB from each frequency.
5. If aided 2 is speech weighted, subtract the speech weighting in Table 2.
The complete formula is then:
Target SPL = Target IG + CRV2 source + AVG REUR
(If Aided2 is composite) - 10.7 dB - speech weighting.
(If Aided2 is speech tone) - speech weighting.
•ToconverttheHTLandUCLfromHLtoSPL:
Add the corrections in Table 3.
•TopredictUCL’s(HL)giventheHTL(HL):
Use Table 4 to convert from HTL to UCL.