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CHAPTER ELEVEN
Configuration
110
Configuration
Fixed test parameters
Min band signal -5dBSPL
Max test time Approx 40s
Min data collected 0.64s per frequency
DP Stims
This sets the target stimulus levels for the tones L1 and L2 that are
represented during the test. The options available are:
60-50
60-55
65-50
65-55
70-70
Higher intensities give a less sensitive hearing screen but may be
necessary to record a response in older patients.
Noise mode
Noise mode sets the method by which the noise floor in DP tests is
calculated.
The Standard mode implements a noise floor which is appropriate for
clinical measurements in which high accuracy (in terms of the dBSPL
of the OAE) is required at each frequency. A good Signal to Noise Ratio
(SNR) in this mode indicates that a high accuracy of measurement has
been reached.
The
Rapid
mode is appropriate for secure detection of the presence of
OAEs at a set number of frequencies for screening purposes. A good
Signal to Noise Ratio (SNR) in this mode indicates high confidence level
that an OAE is present.
The Standard mode can also be used for screening but only in quiet test
conditions. Tests will take longer than the Rapid mode and the confidence
level of the result will exceed that needed for screening.
Otodynamics does not recommend the Rapid mode for clinical
measurements as the dBSPL accuracy may not be sufficient to quantify
changes over time.
Further details of the Noise Modes are included in chapter
23
, Mode of
operation .