摘要:
A device and method for the continuous monitoring of otoacoustic emissions (OAE) levels on an individual worker uses as a pair of earpieces each featuring an external microphone, an internal microphone and a pair of miniature receivers. An adaptive filtering noise rejection processing of the measured distortion product OAE (DPOAE) is used to further improve the Signal-to-Noise ratio in frequencies where passive isolation remains insufficient. The adaptive filtering noise rejection technique relies on a Normalized Least-Mean-Square (NLMS) algorithm that uses the ipsilateral external microphone and the contralateral internal microphone to reject the noise from the measured DPOAE signals for each in-ear OAE probe. A DPOAE signal extraction algorithm provides for an increase in results reliability on a greater dynamic range in DPOAE magnitudes than known methods of DPOAE signal extraction. The device and method is suitable for the continuous monitoring of workers' hearing capabilities in industrial noises up to 75 dB(A).
摘要:
A manually operable dispenser for dispensing earplugs is provided. An exemplary dispenser includes a first dispensing mechanism portion and a second dispensing mechanism portion that interacts with the first dispensing mechanism portion during rotation of the handle. Interaction between the first dispensing mechanism portion and the second dispensing mechanism affects a rotational resistance (τ) at the handle such that rotational resistance (τ) varies between a maximum rotational resistance (τmax) and a minimum rotational resistance (τmin) as the handle is rotated by a user.
摘要:
A hearing assistance system comprises an input unit for providing electric input sound signals u i , each representing sound signals U; from a multitude n u of sound sources S i , an electroencephalography (EEG) system for recording activity of the auditory system of the user's brain and providing a multitude ny of EEG signals y j , and a source selection processing unit receiving said electric input sound signals u i and said EEG signals y j , and in dependence thereof configured to provide a source selection signal Ŝ x indicative of the sound source S x that the user currently pays attention to using a selective algorithm that determines a sparse model to select the most relevant EEG electrodes and time intervals based on minimizing a cost function measuring the correlation between the individual sound sources and the EEG signals, and to determine the source selection signal Ŝ x based on the cost functions obtained for said multitude of sound sources.
摘要:
There is described an earpiece for securing a device within an individual's ear comprising a body made from resilient material and means for attaching the earpiece to the device to form an earpiece assembly, wherein the earpiece body is compressible to allow insertion of the earpiece assembly into the ear and the earpiece body is expandable to substantially fill the individual's auricular cavity. The invention has particular utility for securing an earphone or earplug in the ear. A method for manufacturing the earpiece is also provided.
摘要:
The application relates to an audio processing device comprising a) at least one input unit for providing time-frequency representation Y(k,n) of an electric input signal representing a time variant sound signal consisting of target speech signal components S(k,n) from a target sound source TS and noise signal components N(k,n) from other sources than the target sound source, where k and n are frequency band and time frame indices, respectively, b) a noise detection and/or reduction system configured to b1) determine an a posteriori signal to noise ratio estimate γ(k,n) of said electric input signal, and to b2) determine an a priori target signal to noise signal ratio estimate ζ(k,n) of said electric input signal from said a posteriori signal to noise ratio estimate γ(k,n) based on a recursive decision directed algorithm. The a priori target signal to noise signal ratio estimate ζ(k,n) for the n th timeframe is determined from the a priori target signal to noise signal ratio estimate ζ(k,n-1) for the (n-1) th timeframe and the a posteriori signal to noise ratio estimate γ(k,n) for the n th timeframe. The application further relates to a method of of estimating an a priori signal to noise ratio. Thereby improved noise reduction may be provided. The invention may e.g. be used for the hearing aids, headsets, ear phones, active ear protection systems, handsfree telephone systems, mobile telephones, etc.
摘要:
An ear warmer comprises a frame disposed within a cavity of a shell. The frame includes a band portion and an ear portion. The ear portion includes an inner side disposed adjacent a head of a user when the ear warmer is worn by a user. In one embodiment, the ear portion is curved toward the inner side of the ear portion. In one embodiment, the ear portion is configured to flex when the ear warmer is disposed on a head of a user.
摘要:
Article vestimentaire chauffable servant à fournir de la chaleur aux extrémités corporelles d'un utilisateur, conçu pour permettre l'introduction d'air chauffé (28) dans ledit article vestimentaire. Une première couche extérieure (20) réalisée dans un matériau formant une cavité interne est prévue, laquelle est conçue pour recouvrir partiellement au moins une partie des extrémités de l'utilisateur. Un conduit (23) prévu dans ladite première couche (20) de matériau permet d'introduire de l'air chauffé dans la cavité lorsque l'utilisateur souffle de l'air à l'intérieur. Une deuxième couche intérieure (10) réalisée dans un matériau définissant un espace avec la première couche extérieure de matériau peut être utilisée, dans ce cas l'air chauffé pénètre dans l'espace (12) ainsi créé.
摘要:
Dispositif de protection de l'oreille humaine, ayant la forme d'un organe (2) auto-portant sensiblement plat, possedant un profil exterieur (8) plus large que le profil de l'oreille, et possedant une ouverture (12) au travers de la partie centrale de l'organe d'une dimension permettant a l'helix de l'oreille de passer au travers de l'ouverture, le bord posterieur (16) de l'ouverture etant convexe vers l'arriere, et le bord interieur comprenant a mi-hauteur un lobe (18) en saillie vers l'arriere dans l'ouverture, permettant a l'organe de se maintenir sur l'oreille, le lobe etant adjacent au tragus. Le dispositif peut etre complete par un couvercle fermant un espace adjacent a une face de l'organe. Le dispositif peut etre utilise lors d'interventions chirurgicales et dans le traitement des cheveux.