David E. Blackmer
David E. Blackmer (January 11, 1927 – March 21, 2002) was an American audio electronics engineer, most famous as the inventor of the
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
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
- 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
- Vintage dbx, the sound of the legend
- Video Interview: David Blackmer on "Perceptual Perfection"
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