The hearing threshold is defined as the lowest sound
levels that a listener can detect. Finding accurate hearing threshold is one of
the critical parameters in hearing loss diagnosis and hearing aid. However,
current methods of testing suffer from various problems. One of the main
problems is accuracy. Several contributing factors of inaccuracy have been
identified including the long test duration, which exceeds subject?s attention
span. The amount of experience of the examiner can also affect accuracy. Current
systems also need to be frequently calibrated which requires downtime that leads
to loss in productivity.
Researchers at Arizona State University have developed an
audiometric system that takes less time and automates most of the test
activities thereby increasing accuracy and reducing operating cost.
The new system is a computer based system, which can quickly
acquire a person?s hearing threshold. The system allows for a relatively
accurate determination of the hearing sensitivity with less effort from the
subject. The responses are correlated with exact sound pressure level measured
in the real ear with systematic calibration. Thresholds are determined with a
signal detection theory analysis that can assess the validity and accuracy of
the measurement. Due to the fast threshold estimate, hearing sensitivity can be
measured in higher frequency resolution than currently available techniques. The
system promises accurate diagnosis of lesions in the inner ear and auditory
system and more appropriate prescribing of hearing aid instruments with high
precision.
Potential Applications
- Upgrade current audiometric software systems
- Healthcare physicians
- Ear nose throat centers
- Audiology centers
Benefits and Advantages
- Minimum input from the subject improves efficiency and
reduces test duration
- The new system calibrates automatically vs. frequent
manual calibration
- Efficient and convenient input method scheme allows for
tester?s and subject?s interaction through the main program using a multipoint
input
- Quality control mechanism ensures the quality of the
subject?s response
- Allows for hearing threshold measurements in high
frequency or small frequency spacing
- Significantly improves diagnostic precision and
introduces new fitting techniques for hearing aids