Browse Definitions :
Definition

electret microphone

Contributor(s): Matthew Haughn

An electret microphone is a widely-used electronic communications and audio recording device. The devices are a type of condenser microphone.

As a lost-cost and easily-manufactured recording device that offers good performance, electret microphones are one of the most commonly-used microphone types for all manner of devices.  Electret microphones enable communication and recording in devices including telephones, smartphones, desktop computers, tablets, headsets, high-performance recording systems, hearing aids, megaphones and more. Due to their proliferation, almost everyone uses this type of microphone on an everyday basis.

An electret microphone uses a ferroelectric material, an electret, that has been permanently charged to be polarized with a positive and negative side. Due to this permanent charge, electret microphones do not need an external power source to polarize the electret plate. As in other condenser microphones, the electret plate creates a capacitor with variable capacitance with its movement in relation to the other plate. That variable capacitance is used to generate the recorded electrical signal.

Gerhard Sessler and Jim West invented the electret microphone while working at Bell labs in 1962. While this type of microphone started out as a low-quality device, steady progress has been made, to the point where electret microphones are sometimes used in recording studios and live music performances.

See a demo on wiring electret capsules for a binaural microphone:

This was last updated in December 2016

Continue Reading About electret microphone

Start the conversation

Send me notifications when other members comment.

Please create a username to comment.

-ADS BY GOOGLE

File Extensions and File Formats

Powered by:

SearchCompliance

  • data governance policy

    A data governance policy is a documented set of guidelines for ensuring that an organization's data and information assets are ...

  • risk management

    Risk management is the process of identifying, assessing and controlling threats to an organization's capital and earnings.

  • compliance as a service (CaaS)

    Compliance as a Service (CaaS) is a cloud service service level agreement (SLA) that specified how a managed service provider (...

SearchSecurity

SearchHealthIT

SearchDisasterRecovery

SearchStorage

  • cache memory

    Cache memory, also called CPU memory, is high-speed static random access memory (SRAM) that a computer microprocessor can access ...

  • capacity management

    Capacity management is the broad term describing a variety of IT monitoring, administration and planning actions that are taken ...

  • cloud storage

    Cloud storage is a service model in which data is transmitted and stored on remote storage systems, where it is maintained, ...

Close