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The Cochlea

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.

Hair Cells

Hair Cells

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.

The Auditory Ossicles

The Auditory Ossicles

The auditory ossicles of the middle ear transmit sounds from the air as vibrations to the fluid-filled cochlea. The auditory ossicles consist of two malleus (hammer) bones, two incus (anvil) bones, and two stapes (stirrups), one on each side. These bones develop during the fetal stage and are the ones to ossify first. They are fully mature at birth and do not grow afterward.
The aptly named stapes look very much like a stirrup. The three ossicles are unique to mammals, and each plays a role in...

Hearing

Hearing

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.

Anatomy of the Ear

Anatomy of the Ear

Auditory sensation, commonly called hearing, involves the transformation of sonic waves into neural impulses facilitated by the structures of the auditory organ. The prominent, flesh-like structure on the side of the head, called the auricle, directs sound waves towards the auditory canal. The auricle is often mislabeled as the pinna, a term more aligned with mobile structures like a feline's external ear. The auditory canal penetrates the cranium via the external auditory meatus of the...

Instrumentation Amplifier

Instrumentation Amplifier

An electrocardiography (ECG) machine is an essential piece of medical equipment used to monitor the electrical activity of the heart. It operates by detecting small electrical changes on the skin that result from the depolarization of the heart muscle during each heartbeat. However, these signals are in the microvolt range and can be easily overwhelmed by noise or interference.
To overcome this challenge, an ECG machine utilizes an instrumentation amplifier. This specialized amplifier is...

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Related Experiment Video

Updated: Jun 26, 2026

Robotic Cochlear Implantation for Direct Cochlear Access

Robotic Cochlear Implantation for Direct Cochlear Access

Published on: June 16, 2022

A novel VOCODER for cochlear implants.

P A Johnson¹, D M McNamara, A K Ziarani

¹Department of Electrical and Computer Engineering, Clarkson University, Potsdam, NY 13699, USA. johnsopa@clarkson.edu

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference

|January 24, 2009

Summary

This summary is machine-generated.

A novel VOCODER speech processing strategy enhances cochlear implant performance with improved time-frequency resolution and noise immunity. This new method utilizes a non-linear sinusoid tracking algorithm for better speech coding applications.

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

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

Published on: March 24, 2023

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Last Updated: Jun 26, 2026

Robotic Cochlear Implantation for Direct Cochlear Access

Robotic Cochlear Implantation for Direct Cochlear Access

Published on: June 16, 2022

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

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

Published on: March 24, 2023

Area of Science:

Signal Processing
Biomedical Engineering
Auditory Neuroscience

Background:

Existing VOCODER techniques for cochlear implants face limitations in time-frequency resolution and noise immunity.
Effective processing of non-stationary signals is crucial for clear auditory perception.

Purpose of the Study:

To introduce a new VOCODER-based speech processing strategy for cochlear implants.
To enhance time-frequency resolution and noise immunity compared to current methods.
To explore applications in speech coding.

Main Methods:

Development of a novel VOCODER strategy.
Implementation of a non-linear sinusoid tracking algorithm (STA) for effective tracking of non-stationary sinusoid components.
Evaluation of an eight-band version of the proposed technique.

Main Results:

The proposed method demonstrates superior time-frequency resolution.
The technique offers enhanced noise immunity.
An eight-band implementation showed superior performance compared to existing techniques.

Conclusions:

The new VOCODER strategy offers significant improvements for cochlear implant performance.
Enhanced time-frequency resolution and noise immunity are expected to benefit users.
The method shows promise for advanced speech coding applications.