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Video: Dynamic microphone

The microphone enables us to convert a mechanical vibration into an electrical signal.

Its function is symmetrical to that of a loudspeaker in the chain of transmission. It is thus most often located at the beginning of this chain, at the point of acquisition of data.


In a dynamic microphone, there is a mobile membrane called the diaphragm (…)

a coil of copper wire, also mobile,  as it is attached to the diaphragm (…)

and a permanent magnet, which remains fixed.


The principle of functioning rests on the law of electromagnetic induction:

The rapid displacement of the coil in relation to the magnet’s field induces a voltage at the coil’s poles.

Since the mechanical vibration mirrors the sound vibration, the electrical signal induced in the coil will also mirror the sound vibration.


This type of microphone is easy to manufacture. It does not require any external source of energy and is quite robust, notably for use onstage.


The inertia of the coil-diaphragm couple, on the other hand, makes it less sensitive to high pitches than is the electrostatic microphone.

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