Education
Blackmer attended High Mowing School in Wilton, New Hampshire.
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David Blackmer
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As well as audio noise reduction, Blackmer worked on extending the frequency response of audio electronics beyond the conventionally accepted audible range of 20 kHz. He also published research on the value of ultrasonic frequencies in sound reproduction, claiming that the time resolution of human hearing is 5 microseconds or better—which would correspond to a frequency of 200 kHz, requiring audio equipment ideally to have a flat response to that frequency. He started in audio at Lafayette Radio in Boston in the 1940s and studied electronics in the United States. Navy and at Harvard University and Massachusetts Institute of Technology. He later worked at Transport-Radio Recording Studio, Epsco, Hi-Con Eastern and Raytheon, where he designed telemetry systems for the Mercury space program
He founded dbx in 1971, selling it to BSR in 1979 and staying on with the company for several years.
In the late 1980s he formed Earthworks, producing studio microphones, preamplifiers and studio reference monitors. He also founded Kintek (now Colortek) and Instrumentation Laboratory, as well as running the Cafe Pierrot restaurant in Wilton for a time.
He was also a great reader of science fiction. He had ten children.
United States. Patent 3,681,618, August 1, 1972: Rated Maximum Sinusoidal Circuits with Bipolar Logarithmic Converter
United States. Patent 3,714,462, January 30, 1973: Multiplier Circuits
United States. Patent 4,403,199, September 6, 1983: Gain control systems
United States. Patent 6,091,829, July 18, 2000: Microphone apparatus
United States. Patent 6,526,149, February 25, 2003: System and method for reducing non linear electrical distortion in an electroacoustic device.
Membership
Blackmer was a life member of the Institute of Electrical and Electronics Engineers and a fellow of the Audio Engineering Society from 1976.
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Born
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Died
March 21, 2002 (aged 75) -
Nationality
American