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DSP in Hearing Aids
Published in Francis F. Li, Trevor J. Cox, Digital Signal Processing in Audio and Acoustical Engineering, 2019
In audiology, audiometry is used to assess human hearing acuity and diagnose hearing losses. The audiometry procedure is typically undertaken using an audiometer. The result of the examination is plotted in a graph called an audiogram. The audiogram has a logarithmic frequency scale as its horizontal axis and a linear (in dB) vertical axis. Figure 10.2 shows an audiogram sheet. The vertical axis reading is dB hearing level (dBHL). A basic audiogram starts at a low frequency of 125 Hz and increases at octave intervals to a high frequency of 8 kHz. The dBHL is defined for audiometry with pure tone, and should be differentiated from other dB scales used in electronics and acoustics.
Chapter 3 Physics of the Senses
Published in B H Brown, R H Smallwood, D C Barber, P V Lawford, D R Hose, Medical Physics and Biomedical Engineering, 2017
We can profitably start with a review of some of the terms associated with the science of audition. Audition itself is the faculty or sense of hearing. Audiology is the study and measure of hearing, including the detection and definition of hearing defects. Acoustics is the science of sound. A pure-tone sound wave is one in which the oscillations of pressure and displacement can be described in terms of a simple sine wave. The pure-tone sound wave is described quantitatively by its frequency and intensity. The waveform of all other sounds can be built up from linear combinations of pure tones. A sound wave is described subjectively in terms of its pitch, loudness and quality.
“Do You See What I Hear?”: Designing for Collocated Patient–Practitioner Collaboration in Audiological Consultations
Published in Human–Computer Interaction, 2018
Yngve Dahl, Geir Kjetil Hanssen
The audiology consultation is a key step to receiving treatment for hearing loss. To optimize hearing aid benefit, a hearing aid must be properly shaped to a user’s ear and tuned to accommodate the individual user’s hearing characteristics, needs, and preferences. Hearing aid tuning is typically performed in a clinical environment by a person with audiological background (e.g., an audiologist), as the process requires an in-depth understanding of the human auditory system, including both mechanical phenomena and mental processes of hearing. Additionally, hearing aid tuning requires technical understanding of how a hearing aid works, and knowledge of the tools (software and hardware) used in the process.