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An electret microphone is a type of condenser microphone invented by Gerhard Sessler and Jim West at Bell laboratories in 1962. [24] The externally applied charge used for a conventional condenser microphone is replaced by a permanent charge in an electret material.
Raymond A. Litke (1920-1986) was an American electronic engineer, the inventor of a practical wireless microphone, and the first to patent the wireless microphone.He was born and raised on a farm near Alma, Kansas, but spent most of his adult life in San Jose, California.
An electret microphone is a microphone whose ... but they were considered impractical until the foil electret type was invented at Bell Laboratories in 1961 by ...
1877 : The microphone was first invented by David Edward Hughes, despite Thomas Edison being granted the patent. Hughes discovered that electrical currents varied when sound vibrations were passed through carbon packed into a confined space. His first broadcast was of scratching insects.
Along with Gerhard Sessler, West invented the foil electret microphone in 1962 while developing instruments for human hearing research. [7] [8] Compared to the previous condenser microphones, the electret microphone has higher capacitance and does not require a DC bias. [9]
A wireless microphone, or cordless microphone, is a microphone without a physical cable connecting it directly to the sound recording or amplifying equipment with which it is associated. Also known as a radio microphone , it has a small, battery-powered radio transmitter in the microphone body, which transmits the audio signal from the ...
Edmund Lowe using a ribbon microphone in 1942. In the early 1920s, Drs. Walter H. Schottky and Erwin Gerlach co-invented the first ribbon microphone. [11] By turning the ribbon circuit in the opposite direction, they also invented the first ribbon loudspeaker.
Ring-and-spring microphones, such as this Western Electric microphone, were common during the electrical age of sound recording c. 1925–45.. The second wave of sound recording history was ushered in by the introduction of Western Electric's integrated system of electrical microphones, electronic signal amplifiers and electromechanical recorders, which was adopted by major US record labels in ...