David E. Blackmer (January 11, 1927 – March 21, 2002) was an American audio electronics engineer, most famous as the inventor of the DBX noise reduction system and founder of dbx.[1]
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.[2]
U.S. Patent 3,681,618, August 1, 1972: RMS Circuits with Bipolar Logarithmic Converter
U.S. Patent 3,714,462, January 30, 1973: Multiplier Circuits
U.S. Patent 4,403,199, September 6, 1983: Gain control systems
U.S. Patent 6,091,829, July 18, 2000: Microphone apparatus
U.S. Patent 6,526,149, February 25, 2003: System and method for reducing non linear electrical distortion in an electroacoustic device
References
^Hoffman, F. (2004), Encyclopedia of Recorded Sound, Volume 1 (revised ed.), Taylor & Francis
^Blackmer, David (1999). "The World Beyond 20 kHz" (PDF). Earthworks Audio. Retrieved June 1, 2014.
External links
Stereophile.com obituary
Earthworks Audio Products
Video Interview: David Blackmer on "Perceptual Perfection"
March 26, 2023
david, blackmer, january, 1927, march, 2002, american, audio, electronics, engineer, most, famous, inventor, noise, reduction, system, founder, well, audio, noise, reduction, blackmer, worked, extending, frequency, response, audio, electronics, beyond, convent. David E Blackmer January 11 1927 March 21 2002 was an American audio electronics engineer most famous as the inventor of the DBX noise reduction system and founder of dbx 1 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 2 Blackmer attended High Mowing School in Wilton New Hampshire He started in audio at Lafayette Radio in Boston in the 1940s and studied electronics in the U S Navy and at Harvard University and MIT He later worked at Trans 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 citation needed as well as running the Cafe Pierrot restaurant in Wilton for a time Blackmer was a life member of the IEEE and a fellow of the Audio Engineering Society from 1976 He was also a great reader of science fiction He had ten children A partial list of patents held by David Blackmer EditU S Patent 3 681 618 August 1 1972 RMS Circuits with Bipolar Logarithmic Converter U S Patent 3 714 462 January 30 1973 Multiplier Circuits U S Patent 4 403 199 September 6 1983 Gain control systems U S Patent 6 091 829 July 18 2000 Microphone apparatus U S Patent 6 526 149 February 25 2003 System and method for reducing non linear electrical distortion in an electroacoustic deviceReferences Edit Hoffman F 2004 Encyclopedia of Recorded Sound Volume 1 revised ed Taylor amp Francis Blackmer David 1999 The World Beyond 20 kHz PDF Earthworks Audio Retrieved June 1 2014 External links EditStereophile com obituary Earthworks Audio Products Vintage dbx the sound of the legend Video Interview David Blackmer on Perceptual Perfection Retrieved from https en wikipedia org w index php title David E Blackmer amp oldid 1111319712, wikipedia, wiki, book, books, library,
