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Related Concept Videos

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.

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Related Experiment Video

Updated: May 20, 2026

Performing Repeated Intraoperative Impedance Telemetry Measurements during Cochlear Implantation
06:54

Performing Repeated Intraoperative Impedance Telemetry Measurements during Cochlear Implantation

Published on: August 4, 2023

A non-invasive Cochlear Microphonic measurement system.

Asim Masood1, Paul D Teal, Christopher Hollitt

  • 1School of Engineering and Computer Science, Victoria University of Wellington, P.O. Box 600, Wellington 6140, New Zealand.

Medical Engineering & Physics
|July 31, 2012
PubMed
Summary
This summary is machine-generated.

Measuring the tiny Cochlear Microphonic (CM) electrical potential from the ear is challenging. This study presents a novel biomedical amplifier system designed for accurate, non-invasive CM measurement, improving signal detection.

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Area of Science:

  • Biomedical Engineering
  • Auditory Neuroscience
  • Signal Processing

Background:

  • The Cochlear Microphonic (CM) is a crucial bioelectrical potential generated by the cochlea in response to sound.
  • Measuring the CM non-invasively is difficult due to its extremely small amplitude (sub-microvolt range).
  • Existing methods often struggle with noise interference and limited frequency response.

Purpose of the Study:

  • To develop and present a high-performance biomedical amplifier system for non-invasive measurement of the Cochlear Microphonic.
  • To overcome the challenges posed by the low magnitude and potential noise associated with CM signals.
  • To achieve a system with a high Common Mode Rejection Ratio (CMRR) and wide bandwidth for accurate auditory signal acquisition.

Main Methods:

  • Design and implementation of a specialized biomedical amplifier with a high Common Mode Rejection Ratio (CMRR).
  • Integration of a driven right leg circuit to further enhance noise reduction and CMRR.
  • Utilizing a wide bandwidth (5 Hz-20 kHz) to capture the full spectrum of relevant auditory signals.
  • Non-invasive measurement techniques to acquire the low-magnitude CM signals.

Main Results:

  • The developed amplifier system successfully achieved a high Common Mode Rejection Ratio (CMRR).
  • The system demonstrated a very large bandwidth, covering the range of human hearing (5 Hz-20 kHz).
  • The amplifier enabled the non-invasive measurement of the low-magnitude Cochlear Microphonic (CM) signals.

Conclusions:

  • The presented biomedical amplifier system is effective for the non-invasive measurement of Cochlear Microphonic potentials.
  • The high CMRR and wide bandwidth design are critical for accurately detecting these faint auditory electrical signals.
  • This technology offers a promising advancement for auditory research and diagnostics.