HP RM500SL Manual de usuario descargar pdf (Pagina 69)

0611 RM500SL User’s Guide Version 2.8 Page 69

16.7 SII calculation in Insertion gain

FastFacts 16.7: SII calculation in Insertion gain

The RM500SL calculates a Speech Intelligibility Index (SII) value (in %) 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. 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).

SII (%)

Score (%)

10 1

15 8

20 20

25 45

30 60

35 74

40 84

45 90

50 94

55 96

60 98

70 99

80 100

90 100

1 2 ... 64 65 66 67 68 69 70 71 72 73 74 ... 111 112

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HP RM500SL Manual de usuario Pagina 69