Horizontal localization with bilateral hearing aids: Without is better than with
An overview of the used test setup. The “4 to 13 switch box” is connected to the array of 13 (gray colored) loudspeakers and enables the test program to play target sounds from a personal computer on the speakers (connections are not drawn for reasons of clarity). The compact disk players are connected to the 2 YAMAHA (noncolored) speakers located at and of the subject. These are used to create the noise scenario. A camera is used to monitor the subject.
Up: The time structure of a sample of the used telephone ringing signal which alternates between a “softer” and a “louder” fragment. Middle: The power spectral density of the louder part of the telephone ringing signal. Down: The power spectral density of the softer part of the telephone ringing signal.
The error bars show the rms error per speaker when accumulating all responses of the different test conditions per stimulus location. This was done for the group of normal hearing subjects (NH), the group of hearing impaired subjects without hearing aids (NO), with hearing aids using an omnidirectional configuration (O), and an adaptive directional configuration (A).
All responses given by the normal hearing subjects and the hearing impaired subjects with and without hearing aids for the different stimuli and acoustical conditions. The surface of the circles is proportional to the amount of responses given by the subjects.
The mean responses given by the different normal hearing subjects and the different hearing impaired subjects with and without hearing aids for the different stimuli and acoustical conditions.
ITD and ILD measurements with two Canta7 BTE hearing aids prototypes on a CORTEX manikin in anechoic conditions. Interaural time and level differences were measured between the ITE microphones of a CORTEX manikin (ITD ite, ILD ite), between the front omnidirectional microphones of the BTE devices (ITD front and ILD front), and between the back omnidirectional microphones of the BTE devices (ITD back and ILD back). Measurements were made using a broadband white-noise stimulus.
The audiometric data (in dB HL) of the 10 hearing impaired (HI) subjects and the mean audiometric data of the 10 normal hearing (NH) subjects.
The individual rms data with the mean MAE and rms data of the normal hearing subjects for the four different test conditions. All data are in units of degrees (°)
The individual rms data with the mean rms and MAE data of the hearing impaired subjects for the four different test signals and three different hearing aid settings.
values (with Bonferroni adjustment) of the pairwise comparison for hearing impaired subjects. Conditions without hearing aids (no), with hearing aids with an omnidirectional microphone (o), and with hearing aids with an adaptive directional microphone (a) are compared with each other ( for a significance level of 0.05).
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