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Chosen digital signal processing procedures for hearing aids

100%

Dąbrowski A. , Marciniak T. , Pawłowski P.

2005

tom Vol. 15, no. 3

291--300

This paper presents chosen aspects of developing new DSP algorithms, which can be used in devices for hearing impaired people. We have concentrated on the advanced test for the hearing loss diagnosis and on the real time directional filtering both realized using a DSP (digital signal processor). The analyzed algorithms are implemented using specially designed, experimental DSP modules.

Piezoelectric bone conduction hearing implant Osia® – audiological and quality of life benefits

100%

Marszał J. , Gibasiewicz R. , Błaszczyk M. , Gawłowska M. B. , Gawęcki W.

nr 6

11-22

Introduction: Nowadays, there are many options to treat hearing-impaired patients: tympanoplastic surgery, hearing aids and a wide range of implantable devices. Aim: The aim of this study is to present the mid-term audiological and quality of life benefits after the implantation of Osia®, an active piezoelectric bone conduction hearing implant. Material and methods: The state of the tissues in the implanted area, as well as audiological and quality of life results were analyzed at six, nine and twelve months after implantation in a group of four adult patients with bilateral mixed hearing loss (1 after bilateral canal-wall-down mastoidectomy, 2 with chronic simple otitis media and after myringoplasty in the opposite ear, 1 with bilateral otosclerosis and after stapedotomy in the opposite ear). Results: No postoperative complications were found in any of the cases. One year after surgery the mean audiological gain in FF PTA4 (pure tone average for 0.5, 1, 2, and 4 kHz) was 52.2 ± 3.5 dB in comparison to the unaided situation, the mean speech understanding with Osia® in quiet was 90 ± 8.2% for 50 dB SPL, 98.8 ± 2.5% for 65 dB SPL and 100 ± 0% for 80 dB SPL, and the mean speech understanding with Osia® in noise was 37.5% ± 23.6 for 50 dB SPL, 93.8 ± 4.8% for 65 dB SPL and 98.8 ± 2.5% for 80 dB SPL. There was also an evident improvement in the quality of hearing as well as in the quality of life, measured by APHAB (Abbreviated Profile of Hearing Aid Benefit) and SSQ (Speech, Spatial and Qualities of Hearing Scale). Conclusions: The Osia® is an effective treatment option for patients with bilateral mixed hearing loss. The mid-term audiological and quality of life results are excellent, but further observations including bigger groups of patients and a longer follow-up are required.

Application of sentence tests in the investigation of speech intelligibility in quiet and noise in adult CI recipients supported with a hearing aid

75%

Niewiarowicz M. , Stieler O. , Komar D.

tom Vol. 33, No. 4

475-482

The investigations of speech intelligibility were carried out for 9 patients with a cochlear implant (CI), 1 male and 8 females, aged 18-69 (mean 41). In all cases deafness was recognized as postlingual. All patients were using the hearing aid (HA) on the ear opposite to the CI. The novelty of this work consisted in the application of new Polish sentence tests in the evaluation of the effect of supporting electrical hearing with a HA in noise conditions. The sentence tests (developed at the Institute of Acoustics, Adam Mickiewicz University in Poznań - European Union Project HEARCOM) were presented to patients in quiet and in noise conditions (speech bubble noise). The speech intelligibility was determined in two cases: when transmission was only via the CI and when the HA was also used. The presentation of tests was conducted for three angles (0°, -90° and +90°o) in relation to the patient's head. The value of SRT (Speech Reception Threshold) was determined for the tests carried out in noise conditions. The improvement of the speech intelligibility was affirmed when the process of hearing via the CI was supported with a HA. The particularly essential difference was observed for the angle of +90° (HA-side). The results obtained in the investigations show that acoustic compensation in the range of the remaining audibility field to a great degree supports electrical hearing. This conclusion can be an important contribution to the application of the HA on the side opposite to the CI, especially in the noisy environment.