Microphones and miking techniques - Piezoelectric microphones

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This kind of microphone makes the most of the characteristics of certain elements of ceramic materials: they generate an electric field if they are subjected to compression. When the sound wave reaches the material, the wave compresses and expands it according to its frequency content. Thus the material which has been stimulated produces a corresponding current. These materials have the characteristic of allowing the inverse process to take place too, in the sense that, if they experience a difference in potential they either compress or dilate; this is why they are used in the construction of certain types of loudspeakers. The crystals used for the assembling of these microphones are very sensitive to heat and humidity, and therefore have rather inconstant characteristics. They also have a tendency to weather away quite quickly. The sound quality obtained by this kind of microphone isn't brilliant, therefore they aren't usually used in music recordings but rather in radio and television contexts.








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