Electret Microphones

Electret materials have been known since the 1920s and were proposed as condenser microphone elements several times. However, people considered them impractical before the invention of the foil electret tat Bell Laboratories in 1961 by James West and Gerhard Sessler,...

Fiber Optic Microphones

Recording in Hostile Environments   Fiber optic microphones do not react to or influence any electrical, magnetic, electrostatic or radioactive fields. In other words, this is EMI/RFI immunity. The fiber optic microphone design is therefore ideal for use in areas...

Carbon Microphones

What Are Carbon Microphones?   Thomas Edison officially patented the carbon microphone in 1876. Nevertheless, most people credit the invention to either Emile Berliner in the United States or David Edward Hughes in England, who both happened to invent it around...

Ceramic Microphones

What are Ceramic Microphones?   We can say that ceramic microphones are modern version of crystal (piezoelectric) microphones and they originated in the late 1960s. They were considerably more stable and resistant to shock than electromagnetic microphones...