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Name
of the report
Evaluation
of binaural technology in water listening systems
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Author Panu
Maijala
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Abstract The
aim of the project was to evaluate the utilization potential of binaural
technology in water listening systems.
The
project was carried out in the Acoustics Laboratory of the Helsinki University
of Technology.
A
literature review was written and a large experimental listening test was
carried out. There were 25 persons in the test and part of them were
professional listeners in the Navy.
The
material in the listening test was authentic recordings from hydrophones, sine
signals, and speech. The sounds were listened to by headphones and by
loudspeakers. The test signals were prepared to an 8-channel loudspeaker system
and the same soundscape was auralized to the headphones. Also, adding
reverberation to the auralized signals to improve spatial quality was studied.
An
extensive statistical analysis was carried out and the most significant
dependent variables were found to be errors in estimating the number and
direction of targets.
There
were a few front-back errors, but they appeared mainly in loudspeaker
reproduction.
Finding
the targets was facilitated statistically significantly if the number of
channels was increased from 2 to 8.
The
results show the advantages of binaural technology in water listening systems.
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