scholarly journals Bone conduction microphone measures in the external auditory canal: An application for implementing cross-talk cancellation for bone-conducted sound

2019 ◽  
Vol 40 (5) ◽  
pp. 356-359
Author(s):  
Irwansyah ◽  
Tsuyoshi Usagawa
Keyword(s):  
Cross Talk ◽  
External Auditory Canal ◽  
Bone Conduction ◽  
Cross Talk Cancellation

scholarly journals Vibrational and Acoustical Characteristics of Ear Pinna Simulators That Differ in Hardness

2021 ◽  
Vol 11 (3) ◽  
pp. 327-334
Author(s):  
Ryota Shimokura ◽  
Tadashi Nishimura ◽  
Hiroshi Hosoi
Keyword(s):  
External Auditory Canal ◽  
Sound Pressure ◽  
Bone Conduction ◽  
Calibration Method ◽  
Vibration Acceleration ◽  
Spectral Peaks ◽  
Ear Cartilage ◽  
A Current ◽  
Air Conduction ◽  
Dominant Frequencies

Because cartilage conduction—the transmission of sound via the aural cartilage—has different auditory pathways from well-known air and bone conduction, how the output volume in the external auditory canal is stimulated remains unknown. To develop a simulator approximating the conduction of sound in ear cartilage, the vibrations of the pinna and sound in the external auditory canal were measured using pinna simulators made of silicon rubbers of different hardness (A40, A20, A10, A5, A0) as measured by a durometer. The same procedure, as well as a current calibration method for air conduction devices, was applied to an existing pinna simulator, the Head and Torso Simulator (hardness A5). The levels for vibration acceleration and sound pressure from these pinna simulators show spectral peaks at dominant frequencies (below 1.5 kHz) for the conduction of sound in cartilage. These peaks were likely to move to lower frequencies as hardness decreases. On approaching the hardness of actual aural cartilage (A10 to A20), the simulated levels for vibration acceleration and sound pressure approximated the measurements of human ears. The adjustment of the hardness used in pinna simulators is an important factor in simulating accurately the conduction of sound in cartilage.

scholarly journals Expanded Constellation Mapping for Enhanced Far-End-Cross-Talk Cancellation in G.fast

2017 ◽  
Vol 21 (1) ◽  
pp. 56-59 ◽  
Author(s):  
Rong Zhang ◽  
Anas F. Al Rawi ◽  
Leslie Derek Humphrey ◽  
Lajos Hanzo
Keyword(s):  
Cross Talk ◽  
Cross Talk Cancellation

scholarly journals Air and Bone Conduction Frequency-specific Auditory Brainstem Response in Children with Agenesis of the External Auditory Canal

2017 ◽  
Vol 21 (04) ◽  
pp. 318-322 ◽  
Author(s):  
Pricila Sleifer ◽  
Dayane Didoné ◽  
Ísis Keppeler ◽  
Claudine Bueno ◽  
Rudimar Riesgo
Keyword(s):  
Hearing Loss ◽  
External Auditory Canal ◽  
Conductive Hearing Loss ◽  
Bone Conduction ◽  
Auditory Brainstem ◽  
Auditory Brainstem Responses ◽  
Significant Difference ◽  
Brainstem Response ◽  
Conductive Hearing ◽  
Air Conduction

Introduction The tone-evoked auditory brainstem responses (tone-ABR) enable the differential diagnosis in the evaluation of children until 12 months of age, including those with external and/or middle ear malformations. The use of auditory stimuli with frequency specificity by air and bone conduction allows characterization of hearing profile. Objective The objective of our study was to compare the results obtained in tone-ABR by air and bone conduction in children until 12 months, with agenesis of the external auditory canal. Method The study was cross-sectional, observational, individual, and contemporary. We conducted the research with tone-ABR by air and bone conduction in the frequencies of 500 Hz and 2000 Hz in 32 children, 23 boys, from one to 12 months old, with agenesis of the external auditory canal. Results The tone-ABR thresholds were significantly elevated for air conduction in the frequencies of 500 Hz and 2000 Hz, while the thresholds of bone conduction had normal values in both ears. We found no statistically significant difference between genders and ears for most of the comparisons. Conclusion The thresholds obtained by bone conduction did not alter the thresholds in children with conductive hearing loss. However, the conductive hearing loss alter all thresholds by air conduction. The tone-ABR by bone conduction is an important tool for assessing cochlear integrity in children with agenesis of the external auditory canal under 12 months.

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