Sii Calculation In Speechmap; Using Custom Stimuli In Speechmap - audioscan verifit User Manual

Verification tool

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Note that On-ear mode should be used for vented or open fittings. Vent effects depend on the vent, the ear and

the hearing aid settings and cannot be reliably predicted from coupler measurements.

SII calculation in Speechmap

The Verifit calculates a Speech Intelligibility Index (SII) value (in %) for unaided speech at 65 dB SPL 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 when

using a variety of speech stimulus conditions. (Killion and Mueller, Hearing Journal, January, 2010 pp 10-15).

Custom digital sound files can be used as stimuli in Speechmap. If you connect a USB stick with WAV files on

it to the Verifit, Speechmap will make those files available as stimulus selections. This feature provides the

freedom of using any stimulus in Speechmap with all the features that Speechmap offers. Please note that fitting

targets are not available for custom stimuli.

A USB stick is required for this feature. It is highly recommended that the USB stick is formatted for data using

the Audioscan Updater prior to using this feature. The Audioscan Updater comes with any current Audioscan

software download. Visit

To use digital sound files as stimuli in

1. Connect a USB stick to your PC.

2. Format the USB stick for data using the Audioscan Updater.

Verifit

www.audioscan.com

to obtain software updates.

Speechmap:

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