Sökning: "hearing protectors"

Visar resultat 1 - 5 av 6 avhandlingar innehållade orden hearing protectors.

1. 1. On Transient Noise and its Reduction in Hearing Aids

   Författare :Anders Gingsjö; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; gun shots; sound exposure; speech intelligibility; signal processing; transient reduction; hearing aid; transient noise;

   Sammanfattning : The most important property of a hearing aid is to facilitate verbal communication for hearing impaired people. However, tuning of the acoustical parameters in a hearing aid in order to optimize the speech intelligibility may result in a harsh and unpleasant sound. LÄS MER

3. 2. Acoustical properties of earplugs

   Författare :Per Hiselius; Teknisk akustik; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Maskinteknik; hydraulik; vakuumteknik; vibrationer; akustik; vibration and acoustic engineering; vacuum technology; hydraulics; Mechanical engineering; acoustic modelling; objective measurement; insertion loss; earplugs; HPE; HPD; hearing protectors; Two-Port; Four-Pole; attenuation; electro acoustics; acoustics;

   Sammanfattning : In this study an experimental setup for measurements of high impedance objects in ducts, yielding the acoustical Two-Port properties of the object, is applied to earplugs. A frequently used experimental setup for measuring objective acoustical properties of earplugs is that of artificial ears. Great effort is spent on duplicating the human ear. LÄS MER

4. 3. Noise exposure, hearing protection and hearing loss. A long-term study at an automobile sheet-metal pressing plant

   Författare :Pawel Brühl; Lund näs- och halssjukdomar Öron-; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; audiology; Otorhinolaryngology; noise zone; dosimetry; human; industry; Hearing conservation programme; auditive system and speech; Otorinolaryngologi; audiologi; hörsel- och talorganen;

   Sammanfattning : The design and implementation of a hearing conservation programme in a heavy industry with high noise levels is described. Action was taken on several points, including noise measurements, noise reduction, education on hearing protector use, and audiometric monitoring. LÄS MER

5. 4. Counteracting Acoustic Disturbances in Human Speech Communication

   Författare :Nils Westerlund; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Speech Enhancement; Noise Reduction; Hearing Aids; Adaptive Feedback Control; Ear-Mic; Active Noise Control;

   Sammanfattning : A signal can be said to be any information bearing unit or action carrying a message from a sender to a receiver. This definition covers a vast number of human and non-human actions, ranging from flirtation to satellite communication. This thesis deals with increasing the quality of one of the most ubiquitous human-to-human signals: Speech. LÄS MER

7. 5. Binaural technology and issues related to sound quality analysis and spatial hearing

   Författare :Donatas Trapenskas; Luleå tekniska universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Teknisk akustik; Engineering Acoustics;

   Sammanfattning : Binaural technology makes it possible to record, store and reproduce sound field in a perceptually authentic way, i.e. recorded sounds are correctly reproduced so that it is as if the listener was present in the recorded environment. This method involves recording and correctly reproducing sound pressures at each of the eardrums of the listener. LÄS MER