The internal noise spectrum in miniature electret microphones of the type used in the manufacture of hearing aids is measured. An analogous circuit model of the microphone is empirically fit to the measured data and used to determine the important sources of noise within the microphone. The dominant noise source is found to depend on the frequency. Below 40 Hz and above 9 kHz, the dominant sour...

In a preliminary work it could be shown in temporal bone model that the standard FMT (FMTstand) used principle as middle ear microphone. The main limitation is sensitivity too low for practical use. A modified FMTbig (coil and magnet optimizations) was examined with regard to its microphone properties speech recordings were played directly patient’s CI via Bluetooth first time.

The internal noise spectrum in miniature electret microphones of the type used in the manufacture of hearing aids is measured. An analogous circuit model of the microphone is empirically fit to the measured data and used to determine the important sources of noise within the microphone. The dominant noise source is found to depend on the frequency. Below 40 Hz and above 9 kHz, the dominant sour...

PURPOSE To measure the subjective and objective improvement of speech intelligibility in noise offered by a commercial hearing aid that uses a fully adaptive directional microphone and a noise reduction algorithm that optimizes the Speech Intelligibility Index (SII). RESEARCH DESIGN Comparison of results on the Hearing in Noise Test (HINT) and the Acceptable Noise Level task (ANL). STUDY SA...

This paper introduces a mechanism for localizing a microphone array when the location of sound sources in the environment is known. Using the recently proposed spatial observability function (SOF) based microphone array integration technique, a maximum likelihood estimator for the correct position and orientation of the array is derived. This is used to localize and track a microphone array wit...

Such techniques—known collectively as beamforming—have been the subject of intense interest in recent years within the acoustic array processing research community. Unfortunately, such techniques have been largely ignored in the mainstream automatic speech recognition field, although this may rapidly change given the recent release and widespread popularity of the Microsoft Kinect R © platform....

Three multimicrophone probe arrangements used to measure acoustic intensity are the four-microphone regular tetrahedral, the four-microphone orthogonal, and the six-microphone designs. Finite-sum and finite-difference processing methods can be used with such probes to estimate pressure and particle velocity, respectively. A numerical analysis is performed to investigate the bias inherent in eac...

This study was conducted as part of a project involving the evaluation of a new type of noise exposure monitoring paradigm. Laboratory tests were conducted to assess how "nonstandard" dosimeter microphones and microphone positions measured noise levels under different acoustical conditions (i.e., diffuse field and direct field). The data presented in this article reflect measurement differences...

C a m b r i d g e M A 02138 t N o r t h e a s t e m U n i v e r s i t y B o s t o n M A 02115 In this paper, we present several approaches designed to increase the robustness of BYBLOS, the BBN continuous speech recognition system. We address the problem of increased degradation in • performance when there is mismatch in the characteristics of the training and the test microphones. We introduce...

In this paper we consider a two-channel diversity technique that combines the processed signals of two separate microphones. For in-car applications, this enables a better compromise for the microphone positions. The advantage of the proposed system is its insensitivity with respect to varying speaker sizes or local noise sources. To achieve this we choose the microphone position in that way th...