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David Schwartz to Present Laser-Accurate Mic Technology at AES

David M. Schwartz successfully records sound with his Laser-Accurate microphone technology

Photo provided by Daniel Schwartz

At the 127th Audio Engineering Society Convention, October 9 to 12, 2009, at the Javits Center in New York City, Schwartz Engineering & Design (SED), a leader in optical microphone design, will present its Laser-Accurate technology in booth #845.

Instead of a conventional diaphragm, whose resonance creates electrical impulses against a coil or a back plate, Laser-Accurate technology uses a laminar stream of air in a chamber in which microscopic particles are suspended. When excited by changes in air pressure, the movement of these particles is detected by a laser beam that continuously passes through the chamber aimed at a photoelectric cell opposite the laser source. As a result, Laser-Accurate is said to produce “the most accurate and precise transduction of any sound…capturing sound unadulterated by the mechanical motion of the diaphragm and the inevitable time lags caused by that movement.”

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 coloration—distortion—to the sound it’s recording. In the Laser-Accurate design, 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.

David Schwartz, developer of Laser-Accurate technology and a holder of six critical digital audio patents, including one that is the basis for the MP3 file format, says, “The color that certain microphones bring can be fantastic. The problem is, you can’t have all of them, all of the time, meaning that all music recording is a compromise of some sort. With Laser-Accurate technology, all the tonal processing would take place after the sound is converted to a voltage, not during the act of recording it.”

Laser-Accurate technology will be demonstrated throughout the four days of the AES Convention at the Schwartz Engineering & Design booth.  

Visit Schwartz Engineering & Design at

Audio professionals can attend the upcoming 127th AES Convention in New York (October 9 to 12, 2009) with a complimentary “Exhibits Only” VIP registration courtesy of Mix magazine. Visit the AES VIP registration page for your free registration.