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Microphone diaphragms, unlike speaker diaphragms, tend to be thin and flexible, since they need to absorb as much sound as possible. In a condenser microphone, the diaphragm is placed in front of a plate and is charged. [2] In a dynamic microphone, the diaphragm is glued to a magnetic coil, similar to the one in a dynamic loudspeaker.
Sennheiser MD 421 microphone, original light gray model. The Sennheiser MD 421 is a German cardioid dynamic microphone, widely used for speech in broadcasting and for music in live concerts and the recording studio. Introduced in 1960, the internal large-diaphragm transducer element of the MD 421 is still produced unchanged by Sennheiser.
The diaphragm also had an anti-corrosion treatment to protect it from air-borne contamination from the presenter's voice. The D-22 and D-33 were dual-impedance microphones with the high or low impedance selected using an innovative "linkage bar" under the name plate and a unique "slide-lock" microphone stand mount. [1]
The Electro-Voice RE20 is an American professional cardioid dynamic microphone, commonly used in broadcasting applications since 1968. Designed by Electro-Voice using the company's patented Variable-D technology and a large-diaphragm element, it has been described as an industry standard "iconic" microphone for its natural sound and its wide ...
The dynamic microphone (also known as the moving-coil microphone) works via electromagnetic induction. They are robust, relatively inexpensive and resistant to moisture. This, coupled with their potentially high gain before feedback, makes them popular for on-stage use. Dynamic microphones use the same dynamic principle as in a loudspeaker ...
The diaphragm of the microphone responds to changes in air pressure caused by sound waves. That is why the instrument is sometimes referred to as a sound pressure level meter (SPL). This movement of the diaphragm, i.e. the sound pressure (unit pascal, Pa), is converted into an electrical signal (unit volt, V).
Foil-type or diaphragm-type A film of electret material is used as the diaphragm itself. This is the most common construction. It is often considered the lowest quality, as the electret material used sometimes does not make a particularly good diaphragm. Modern materials have enabled very comparable performance to other designs. Back electret
Analog sound reproduction is the reverse process, with a larger loudspeaker diaphragm causing changes to atmospheric pressure to form acoustic sound waves. Digital recording and reproduction converts the analog sound signal picked up by the microphone to a digital form by the process of sampling.