Products > Diagnosis of central auditory disorders

AudioLab

AudioLab is easy to operate and user friendly software package. It requires no programming skills.

Why AudioLab ?

    Diagnosis of central auditory disorders consists of running certain hearing tests using an audio tape with standard material. Once an audiotape has been prepared, administering the test appears to be a routine task. However this is not so. How can one administer a test in English language with American accent to an Indian villager?
AudioLab allows an Audiologist to prepare the tests in any desired language and accent to suit the local requirements.
AudioLab also enables an Audiologist to develope new test material for research purposes.
AudioLab can be used to administer the test in auto or manual mode using the PC and keep a record of the subject's responses.

Modules

Utility Module

Signal Recording, Display and Editing: Speech signal can be recorded and saved into a file. Sampling frequency, duration of signal to be recorded can be specified. Speech Signal can be displayed partly or wholly. Signal can be normalized for calibrated SPL output; signal can be scaled;,a part or whole of a signal can be played. Upto two signals can be opened. Edit options: copy, delete, insert silence, insert file.

Making a Test audio tape/ Running a Test: This utility can be used to prepare an audio tape of the test material with randomized sequence of stimuli and inter-stimulus interval. An announcement and a leading tone can be prefixed. The audio tape can later on be presented via an Audiometer with controlled Hearing Levels.
This utility can be used to conduct the test directly. Test can be run in Manual or Auto mode. Inter-stimulus interval can be specified. The test can be paused or aborted any time. User's response can be recorded and performance score is shown. User's response is saved in a file.

Speech reception threshold test: Test words can be presented at any desired SPL to either ear with or without masking. Masking can be wide-band white random noise or speech-spectrum noise.

Central Auditory Tests Module

Dichotic test: The test material consists of binaural presentation of competing stimuli. Example: Digits to both left and right ears such as 'One_Three-Five_Six'. 'One' is fed to left ear while 'Five' is fed to right ear and after a gap 'Three' is fed to left ear and 'Six' is fed to right ear.
This module enables the audiologist to open the required files and prepare the dichotic stimulus. The opened files can be permuted so that with a single set of files several stimuli can be prepared. The gap between pairs can be controlled. Signals can be normalized so that all spoken material is of same intensity.

Staggered spondee: The test material consists of pairs of spondee words presented binaurally. The first word of the first pair being presented initially. The second word of the first pair and the first word of the second pair occur simultaneously. Example:
This module enables the audiologist to open the required files and prepare the spondee test stimulus. The instant of the occurrence of the words can be controlled. Left and right ear presentation can be swapped. Signals can be normalized so that all spoken material is of same intensity.

Binaural fussion: In this test, speech signal is split into two separate bands (Band 1: 500 to 700 Hz and Band 2 : 1900 to 2100 Hz) and presented to left and right ears simultaneously.
This module enables the audiologist to open the required file and prepare the stereo output file for the test.

Filtered speech: In this test, speech is low-pass filtered (cut-off: 500 Hz and roll-off 18 dB per octave). This module enables the audiologist to open the required file and prepare the output file for the test.

Compressed speech: Compressed speech is obtained from the normal speech by cutting-off (splicing) segments thus affecting the intelligibility. This module enables the audiologist to open the required file. Audiologist can specify Percent compression, average duration of segment to be cut and the number of segments to be cut. The cut can be hard (abrupt) or soft (gradual). The cuts can be uniformly or randomly spaced.

Peripheral Auditory Tests Module (PAT)

Duration pattern test (DPT): The stimulus consists of three tones in succession of different duration but same frequency.The frequency is 1000 Hz and duration is either 250 or 500 msec. The gap between the tones is 250 msec. Test material consists of randomly occuring stimuli such as 'Long-Long-Short', 'Short-Long-Short' etc.

Frequency pattern test (FPT): The stimulus consists of three tones of either Low or High frequency in succession but of same duration, viz., 500 msec. The tone frequency is either 882 Hz (Low) or 1102.5 Hz (High). Test material consists of randomly occuring stimuli such as 'High-High-Low', 'Low-Low-High' etc.

Go Back   

Copyright 2002 Voice and Speech Systems