A single-channel adaptive audio equalizer, with 32 third-octave bands for professional use, has been developed. The conventional slider potentiometers have been replaced by 8-bit DAC's to give full digital control. This is combined with a bandpass filter with digitally-programmable centre frequency, acting as a spectrum analyzer, to allow the instrument to measure the frequency-response of a listening room, and automatically apply the inverse response to mull the coloration. Alternative responses may be manually programmed and stored in preset memory for easy recall, and mathematical functions upon a stored response are also possible.

Author: McGee, Philip J.
Affiliations: National Institute for Higher Education, Plassey Technological Park, Limerick City, Ireland ; Kruburg 26, 5632 PH Eindhoven, The Netherlands(See document for exact affiliation information.)
AES Convention: 80 (March 1986) Paper Number: 2347
Publication Date: March 1, 1986
Subject: Audio Electronics

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