Archives of Acoustics, 36, 3, pp. 499–508, 2011

Simultaneous Measurement of the DPOAE Signal Amplitude and Phase Changes

Wrocław University of Technology Institute of Telecommunications, Teleinformatics and Acoustics

Wrocław Medical University Department of Otolaryngology, Faculty of Dentistry

Wrocław Medical University Department of Pharmacology

Although the phenomenon of otoacoustic emission has been known for nearly
30 years, it has not been fully explained yet. One kind of otoacoustic emission
is distortion product of the otoacoustic emission (DPOAE). New aspects of this
phenomenon are constantly discovered and attempts are made to interpret correctly
the obtained results. This paper discusses a new method of measuring DPOAE
signals based on double phase-sensitive detection, which makes possible a real-time
measurement of the DPOAE signal amplitude and phase. The method was applied
for measurements of DPOAE signals in guinea pigs. Sample records are presented
and the obtained results are discussed.
Keywords: signals; double-phase-sensitive detection; guinea pigs
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