Audioscan Verifit 2 Manuel d'utilisateur télécharger pdf (Page 47)

Verifit

User's Guide Version 4.2 © June 2015

Camfit in Speechmap

Camfit is an approach to fitting hearing aids developed by Brian Moore at the University of Cambridge, UK. It

specifies the level-dependent gain required to correct abnormal loudness as modeled by his cochlear hearing loss

simulation. It provides two approaches to correcting for the hearing loss:

Camfit restoration aims to amplify sounds that are soft, comfortable and loud for a person with normal hearing

so that they are soft, comfortable and loud for a hearing aid wearer. This is the stated goal of the IHAFF

(International Hearing Aid Fitting Forum) fitting method.

Camfit equalisation aims to amplify speech to produce the same loudness in each critical band. It has been

argued that this is likely to give the highest intelligibility for a given overall loudness. This is the rationale

behind the NAL fitting methods and will generally produce similar targets.

Using Speechmap

The Speechmap fitting environment provides a number of distinctly different stimuli. Speech and noise are

analyzed in 1/3 octave bands and for most speech stimuli data are presented as 3 curves. The top curve is the

level exceeded 1% of the time (speech peaks), the lower curve is the level exceeded 70% of the time (speech

valleys) and the middle curve is the average. Clicking causes the signal to be presented continuously - the

speech signals run in a loop - and the curves are updated frequently to show any changes you make to the

hearing instrument. Clicking on restarts the speech passage and the curves are then calculated for the entire

passage, producing an accurate display of the speech region and LTASS, and an accurate SII calculation. When

using live speech, a pause button [;] captures short-term speech features. See SII calculation in Speechmap and

Speechmap Technical Details.

Before starting, please see On-Ear Measures - Setup, Speechmap Setup, Speechmap facts, On-ear or Test box

mode.

• To access Speechmap: right click and then select Speechmap under On-ear or Test box.

• To change screen setup: see On-Ear Measures Screen Setup, and On-ear or Test box mode.

• To set up hearing instrument type: click on ▼ in the Audiometry section and select BTE, ITE,

ITC, CIC, RITE (receiver in the ear – test box mode), Open (On-ear mode), Body, CROS (On-ear

mode) or FM from the list.

• To enter audiometric data: see Assessment data entry.

• To start a test: click on in any of the test areas

• To select stimulus type: click the down arrow beside the stimulus window and select from the list. See

Setup Speechmap to customize the list.

• To select stimulus level: click the down arrow beside the stimulus window and select from the list.

• To complete a measurement and store the result: click on while the stimulus is running.

• To stop a test without recording any test data: click on

• To capture the current screen curves when using live speech: click on the pause button [;].

See, Screen tour and Speechmap Fitting Procedures.

Speechmap Setup

Speechmap provides a number of different test stimuli for fitting hearing aids and testing various aspects of their

performance. Each time you run a test, you have the opportunity to select the stimulus from a list. You can

manage which stimuli appear on this list by doing the following:

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Audioscan Verifit 2 Manuel d'utilisateur Page 47