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Related Concept Videos

The Cochlea01:13

The Cochlea

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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.
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Hair Cells01:22

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Hair cells are the sensory receptors of the auditory system—they transduce mechanical sound waves into electrical energy that the nervous system can understand. Hair cells are located in the organ of Corti within the cochlea of the inner ear, between the basilar and tectorial membranes. The actual sensory receptors are called inner hair cells. The outer hair cells serve other functions, such as sound amplification in the cochlea, and are not discussed in detail here.
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Auditory Pathway01:15

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Auditory pathways constitute the complex neural circuits responsible for transmitting and interpreting auditory information from the peripheral auditory system to the brain. Sound waves are initially captured by the outer ear, funneled through the ear canal, and reach the tympanic membrane (eardrum). These vibrations are transmitted via the middle ear's ossicles to the inner ear's cochlea.
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When we hear a sound, our nervous system is detecting sound waves—pressure waves of mechanical energy traveling through a medium. The frequency of the wave is perceived as pitch, while the amplitude is perceived as loudness.
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The human brain perceives pitch through two primary mechanisms reflected in place theory and frequency theory. Each mechanism describes how sound waves are interpreted as specific pitches by the brain, offering insights into the intricate processes of auditory perception.
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The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...
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Related Experiment Video

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Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages
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Dual-carrier processing to convey temporal fine structure cues: Implications for cochlear implants.

Frédéric Apoux1, Carla L Youngdahl1, Sarah E Yoho1

  • 1Speech Psychoacoustics Laboratory, Department of Speech and Hearing Science, The Ohio State University, Columbus, Ohio 43210, USA.

The Journal of the Acoustical Society of America
|October 3, 2015
PubMed
Summary
This summary is machine-generated.

Vocoder processing degrades speech intelligibility in noise not by losing temporal fine structure (TFS) information, but by reducing sound-source segregation cues. Using a dual-carrier approach significantly improved intelligibility, approaching unprocessed speech levels.

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Area of Science:

  • Auditory Neuroscience
  • Speech Processing
  • Signal Processing

Background:

  • Vocoder processing alters temporal fine structure (TFS), potentially degrading speech intelligibility in noise.
  • Current understanding attributes degradation to TFS information loss, but this study proposes an alternative explanation.

Purpose of the Study:

  • To investigate the role of sound-source segregation cues in speech intelligibility.
  • To determine if preserving carrier duality, rather than TFS information, improves intelligibility in noise.

Main Methods:

  • Implemented a dual-carrier vocoder approach, separating target and background sounds onto different carriers.
  • Compared intelligibility in noise for dual-carrier conditions against traditional single-carrier vocoder conditions.
  • Ensured experiments did not preserve speech TFS to isolate the effect of carrier duality.

Main Results:

  • Substantial improvements in sentence intelligibility in noise were observed with the dual-carrier approach.
  • Intelligibility in several dual-carrier conditions approached levels seen with unprocessed speech.
  • The findings support the hypothesis that carrier duality and segregation cues are crucial for intelligibility.

Conclusions:

  • Speech intelligibility degradation in vocoded speech is primarily due to the loss of sound-source segregation cues, not TFS information.
  • The dual-carrier approach offers a promising strategy for enhancing speech perception in noisy environments.
  • This method has potential applications in cochlear implant speech processors for improved speech-from-noise segregation.