RM500SL
®
User's Guide Version 3.4
June 2011
See Insertion gain in SPL and Insertion gain in HL for an explanation of screen curves. See
SII calculation in Insertion gain
NOTE:
Because it is analyzed in 1/3 octave bands, the Noise stimulus produces a REAR up
to 12 dB below that produced by the Swept stimulus at the same overall level. The REIGs
will be similar except at levels which cause non-linear operation of the hearing instrument.
SII calculation in Insertion gain
The RM500SL calculates a Speech Intelligibility Index (SII) value for unaided speech at 70
dB SPL (REUR), the target REIG and for each aided test. The calculations use the 1/3 octave
band method of ANSI S3.5 –1997 without the 160 Hz band and without masking effects
with results expressed as a % by multiplying by 100. Level distortion effects are included
but no hearing loss desensitization is applied. An idealized speech region of LTASS +/- 15
dB is used.
The speech recognition associated with a given SII is a function of the test material and the
cognitive abilities of the listener. There is considerable individual variability in relating the
SII to speech recognition, especially amongst impaired listeners. The following shows
expected nominal recognition scores vs SII for normals on the Connected Speech Test
(Sherbecoe and Studebaker 2003).
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Summary of Contents for RM500SL
Page 1: ...RM500SL User s Guide Version 3 4 March 2010...
Page 9: ...RM500SL User s Guide Version 3 4 June 2011 EC Declaration of Conformity 9...
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Page 43: ...RM500SL User s Guide Version 3 4 June 2011 telecoil test 43...
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Page 57: ...RM500SL User s Guide Version 3 4 June 2011 57...
Page 64: ...RM500SL User s Guide Version 3 4 June 2011 64...
Page 78: ...RM500SL User s Guide Version 3 4 June 2011 Screen tour unaided screen 78...
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