Relatively simple laser technology may revolutionise the very concept of the microphone, trading mechanical parts movement for incredibly precise measurement by a laser of the movement of particulates suspended in air.
Proof-of-concept was demonstrated by Laser-Accurate inventor and digital audio pioneer David Schwartz at AES (Audio Engineering Society) show floor in New York, on September 21, 2009.
There have been several key milestones in the evolution of the microphone, from the development of the basic transducer in the 19th century, to the introduction of the condenser microphone in the 1920s, followed by FET microphones in the 1960s and the more recent multichannel microphones used for surround audio applications. The next step in this evolutionary procession will be introduced at the 127th Audio Engineering Society Show, Oct. 9-12, 2009, at the Javits Center in New York City.
Conventional microphone design has numerous inherent idiosyncrasies: the speed with which a traditional diaphragm can react is innately limited by its physical size and shape, and the variety of those mechanical elements inevitably adds tonal colouration — distortion — to the sound it’s recording. In the design of Laser-Accurate, the diaphragm or plate is replaced with microscopic particles dispersed in a gas-filled chamber in which the laminar flow of the gas is constant. Detection of the displacement of the airstream and particles by a laser and optical receiver creates a completely non-intrusive method by which to measure the movement of air. This arrangement means no significant mass stands between the source of the sound and the transduction of it to a recording media.
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