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Related Concept Videos

Perception of Sound Waves01:01

Perception of Sound Waves

The human ear is not equally sensitive to all frequencies in the audible range. It may perceive sound waves with the same pressure but different frequencies as having different loudness. Moreover, the perception of sound waves depends on the health of an individual's ears, which decays with age. The health of one's ears may also be affected by regular exposure to loud noises.
The pitch of a sound depends on the frequency and the pressure amplitude of the source. Two sounds of the same frequency...
Doppler Effect - II01:05

Doppler Effect - II

The Doppler effect has several practical, real-world applications. For instance, meteorologists use Doppler radars to interpret weather events based on the Doppler effect. Typically, a transmitter emits radio waves at a specific frequency toward the sky from a weather station. The radio waves bounce off the clouds and precipitation and travel back to the weather station. The radio frequency of the waves reflected back to the station appears to decrease if the clouds or precipitation are moving...
The Cochlea01:13

The Cochlea

The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.
Auditory Perception01:17

Auditory Perception

The auditory system is essential for sound perception, utilizing various critical structures. When sound waves enter the outer ear, they travel through the ear canal and cause the eardrum to vibrate. These vibrations are then transmitted to the middle ear, where three tiny bones – the malleus, incus, and stapes – amplify the sound. This amplification is crucial, as it ensures that the sound vibrations are strong enough to be conveyed to the inner ear. These vibrations then reach the cochlea, a...
Downsampling01:20

Downsampling

When considering a sampled sequence with zero values between sampling instants, one can replace it by taking every N-th value of the sequence. At these integer multiples of N, the original and sampled sequences coincide. This process, known as decimation, involves extracting every N-th sample from a sequence, thereby creating a more efficient sequence.
The Fourier transform of the decimated sequence reveals a combination of scaled and shifted versions of the original spectrum. This...
Upsampling01:22

Upsampling

Managing signal sampling rates is essential in digital signal processing to maintain signal integrity. A decimated signal, characterized by a reduced frequency range due to its lower sampling rate, can be upsampled by inserting zeros between each sample. This upsampling process expands the original spectrum and introduces repeated spectral replicas at intervals dictated by the new Nyquist frequency. To refine this zero-inserted sequence, it is passed through a lowpass filter with a cutoff...

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Related Experiment Video

Updated: Jul 18, 2026

Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages
06:04

Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages

Published on: March 24, 2023

Frequency-compression outcomes in listeners with steeply sloping audiograms.

Andrea Simpson1, Adam A Hersbach, Hugh J McDermott

  • 1Department of Otolaryngology, The University of Melbourne, Australia. asimpson@bionicear.org

International Journal of Audiology
|November 23, 2006
PubMed
Summary

This study found that an experimental frequency-compression hearing aid offered limited benefit for individuals with steeply sloping hearing losses, showing no significant improvement in speech perception compared to conventional hearing aids.

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Neuro-rehabilitation Approach for Sudden Sensorineural Hearing Loss
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Neuro-rehabilitation Approach for Sudden Sensorineural Hearing Loss

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Last Updated: Jul 18, 2026

Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages
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Published on: March 24, 2023

Neuro-rehabilitation Approach for Sudden Sensorineural Hearing Loss
09:44

Neuro-rehabilitation Approach for Sudden Sensorineural Hearing Loss

Published on: January 25, 2016

Area of Science:

  • Audiology
  • Hearing Science
  • Speech Perception

Background:

  • Previous research indicated benefits of frequency-compression hearing aids for moderate hearing loss.
  • Frequency-compression technology shifts high-frequency sounds to lower frequencies while amplifying them.

Purpose of the Study:

  • To evaluate an experimental frequency-compression hearing aid in individuals with steeply sloping hearing losses.
  • To compare speech perception performance with the experimental device versus a conventional hearing instrument.

Main Methods:

  • Seven subjects with steeply sloping hearing losses participated.
  • Speech perception in quiet and noise was tested using the frequency-compression device and a conventional hearing aid.
  • Subjective sound quality preferences were also assessed.

Main Results:

  • No significant group differences were observed for speech understanding in quiet.
  • Only one of five subjects showed improvement in speech perception in noise with the frequency-compression device.
  • Most subjects preferred the sound quality of conventional hearing instruments.

Conclusions:

  • The experimental frequency-compression scheme provided limited benefit for listeners with steeply sloping hearing losses.
  • Conventional hearing aids may be more suitable for this patient group.
  • Further research may be needed to optimize frequency-compression strategies for severe hearing impairments.