Audioscan Verifit 2 Bedienungsanleitung PDF herunterladen (Seite 53)

Verifit

User's Guide Version 4.2 © June 2015

multiple USB sticks or organize your files into folders, moving them into the top level directory of the USB

stick as needed.

3. Removing the USB stick while a Test poster is open may cause unexpected behavior. Close the Test poster

before removing the USB stick from the Verifit.

Creating WAV files for Speechmap

WAV is a commonly used format for digital audio and can be created/edited by nearly all audio editing and

recording software. A WAV file has many properties that define the format of the digital audio. When a USB

stick is connected to the Verifit, Speechmap looks for files in the top level directory that have the following

properties:

File format: WAV

Data format: PCM (no compression)

Sampling Rate: 32 kHz

Bit precision: 16 or 32 bit

Channels: Mono

File name: 15 characters or less, not including .wav extension

Existing WAV files can easily be converted to match these specifications using your preferred audio editing

software.

Leveling Options

By default, Speechmap will automatically level the WAV file so that the SPL matches the level selected for the

test.

The automatic leveling of the WAV file can be modified by inserting a tag in the filename. This feature allows

you to fine tune the output level of your stimulus. The tag must be added at the end of the filename but before

the extension.

Example: filename_+2.5.wav

The tag must consist of an underscore, followed by a plus or minus sign, followed by the modifier in dB. In the

example above, the tag "_+2.5" will level the file to be 2.5 dB above nominal.

There are no restrictions on the magnitude of the modifier; there is built-in protection against speaker overdrive.

Precision is limited only by the 15 character limit of the filename.

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Audioscan Verifit 2 Bedienungsanleitung Seite 53