A new objective measurement system to predict speech intelligibility in binaural listening conditions is proposed for use with nonlinear hearing devices. Digital processing inside such devices often involves nonlinear operations such as clipping, compression, and noise reduction algorithms. Standard objective measures such as the Articulation Indeix (AI), the Speech Intelligibility Index (SII) and the Speech Transmission Index (STI) have been developed for monaural listening. Binaural extensions of these measures have been proposed in the literature, essentially consisting of a binaural pre-processing stage followed by monaural intelligibility prediction using the better ear or the binaurally enhanced signal. In this work, a three-stage extension of the binaural SII approach is proposed that deals with nonlinear acoustic input signals. The reference-based model operates as follows: (1) a stage to deal with nonlinear processing based on a signal-separation model to recover estimates of speech, noise and distortion signals at the output of hearing devices; (2) a binaural processing stage using the Equalization-Cancellation (EC) model; and (3) a stage for intelligibility prediction using the SII or the short-time Extended SII (ESII). Multiple versions of the model have been developed and tested for use with hearing devices. A software simulator is used to perform hearing-device processing under various binaural listening conditions. Details of the modeling procedure are discussed along with an experimental framework for collecting subjective intelligibility data. In the absence of hearing-device processing, the model successfully predicts speech intelligibility in all spatial configurations considered. Varying levels of success were obtained using two simple distortion modeling approaches with different distortion mechanisms. Future refinements to the model are proposed based on the results discussed in this work.

Objetivo: comparar o reconhecimento de fala na situação de silêncio e ruído com a prótese auditiva de orelha média totalmente implantável Esteem® em relação à prótese auditiva. Descrever a satisfação auditiva e as complicações cirúrgicas encontradas. Desenho do Estudo: estudo exploratório, prospectivo, intragrupo, sujeito como seu próprio controle. Pacientes: usuários de prótese auditiva com perda neurossensoraial moderada a severa bilateral. Intervenção: dez pacientes submetidos a cirurgia para colocação da prótese totalmente implantável Esteem®. Aplicação de questionário SADL no pré- e pós-operatório. Desfechos: reconhecimento de fala no silêncio e ruído, resultados do SADL e complicações do procedimento foram avaliadas. Resultados: Não houve diferença estatisticamente significante entre reconhecimento de fala nas condições de silencio e ruído em relação as próteses auditivas (p=0,23 e p= 0,0438). Houve diferença estatisticamente significante no score do SADL pré- e pós-operatório (p= 0,0076). Houve três necessidades de reintervenção cirúrgica, em uma delas a prótese precisou ser removida. Conclusões: Melhora da satisfação auditiva, tendência a melhora no reconhecimento de fala nas situações de silêncio e ruído. Procedimento deve ser realizado por cirurgiões otológicos experientes. / Objective: to compare speech discrimination in silence and in noise with the Esteem® totally implantable hearing device versus hearing aids, and to describe satisfaction with amplification and surgical complications in patients undergoing implantation of the Esteem® device. Study Design: this was an exploratory, prospective, within-group, subject-as-own-control study. Setting: tertiary referral center. Patients: hearing aid users with moderate to severe bilateral sensorineural hearing loss. Interventions: ten patients underwent placement of the Esteem® totally implantable hearing device. The Satisfaction with Amplification in Daily Life (SADL) questionnaire was administered pre- and postoperatively. Main Outcome Measures: speech discrimination in silence and noise, SADL scores, and complications were evaluated. Results: there were no statistically significant differences between hearing aids and the Esteem® device in speech discrimination in silence (p=0.23) or noise (p=0.0438). There was a significant difference between pre and postoperative SADL scores (p=0.0076). Three patients required reintervention, and one ultimately required explantation of the device. Conclusions: Use of the Esteem® device was associated with improved satisfaction with amplification and a trend toward improvement in speech discrimination in silence and noise. Implantation of the device is challenging and should be performed by experienced otologic surgeons.

Objetivo: comparar o reconhecimento de fala na situação de silêncio e ruído com a prótese auditiva de orelha média totalmente implantável Esteem® em relação à prótese auditiva. Descrever a satisfação auditiva e as complicações cirúrgicas encontradas. Desenho do Estudo: estudo exploratório, prospectivo, intragrupo, sujeito como seu próprio controle. Pacientes: usuários de prótese auditiva com perda neurossensoraial moderada a severa bilateral. Intervenção: dez pacientes submetidos a cirurgia para colocação da prótese totalmente implantável Esteem®. Aplicação de questionário SADL no pré- e pós-operatório. Desfechos: reconhecimento de fala no silêncio e ruído, resultados do SADL e complicações do procedimento foram avaliadas. Resultados: Não houve diferença estatisticamente significante entre reconhecimento de fala nas condições de silencio e ruído em relação as próteses auditivas (p=0,23 e p= 0,0438). Houve diferença estatisticamente significante no score do SADL pré- e pós-operatório (p= 0,0076). Houve três necessidades de reintervenção cirúrgica, em uma delas a prótese precisou ser removida. Conclusões: Melhora da satisfação auditiva, tendência a melhora no reconhecimento de fala nas situações de silêncio e ruído. Procedimento deve ser realizado por cirurgiões otológicos experientes. / Objective: to compare speech discrimination in silence and in noise with the Esteem® totally implantable hearing device versus hearing aids, and to describe satisfaction with amplification and surgical complications in patients undergoing implantation of the Esteem® device. Study Design: this was an exploratory, prospective, within-group, subject-as-own-control study. Setting: tertiary referral center. Patients: hearing aid users with moderate to severe bilateral sensorineural hearing loss. Interventions: ten patients underwent placement of the Esteem® totally implantable hearing device. The Satisfaction with Amplification in Daily Life (SADL) questionnaire was administered pre- and postoperatively. Main Outcome Measures: speech discrimination in silence and noise, SADL scores, and complications were evaluated. Results: there were no statistically significant differences between hearing aids and the Esteem® device in speech discrimination in silence (p=0.23) or noise (p=0.0438). There was a significant difference between pre and postoperative SADL scores (p=0.0076). Three patients required reintervention, and one ultimately required explantation of the device. Conclusions: Use of the Esteem® device was associated with improved satisfaction with amplification and a trend toward improvement in speech discrimination in silence and noise. Implantation of the device is challenging and should be performed by experienced otologic surgeons.