Automatic graphic equalizer

Details Automatic graphic equalizer Automatic graphic equalizer

1985-10-31

1987-08-18

Rubinson, Gene Z.

Electrical audio signal processing systems and devices

Including frequency control

Having automatic equalizer circuit

381102, 381107, H04R 304

Patent

active

046882588

ABSTRACT:
An automatic graphic equalizer for a sound system has circuitry for measuring the effect of the physical environment receiving a sound on the frequency characteristics of the sound, and for adjusting the characteristics of a graphic equalizer to compensate for distortions in the desired flat frequency response caused by the physical environment. The circuitry includes a pink noise generator supplying pink noise to the graphic equalizer during an initialization operation, the graphic equalizer being controlled by a controller to present a flat frequency characteristic. The equalizer output is sent to a speaker which supplies the pink noise as a sound signal to the selected environment. A microphone picks up the sound in the selected environment and converts it to an electrical signal which is supplied through an ALC amplifier to a frequency-variable band-pass filter to detect the signal level in each of the equalizer frequency bands. The level signals are smoothed in a level detector and digitized to be input to the controller which readjusts the graphic equalizer to compensate for distortions in the desired flat frequency response caused by the selected environment.

REFERENCES:
patent: 3207848 (1965-09-01), Bore
patent: 3708746 (1973-01-01), Willett
patent: 3732370 (1973-05-01), Sacks
patent: 4045731 (1977-08-01), Tokunou
patent: 4340780 (1982-07-01), Odlen
patent: 4458362 (1984-07-01), Berkovitz
patent: 4610024 (1986-09-01), Schulhof
"Simple Spectrum Analyser Covers Four Octaves," Electronic Product Design, vol. 1, No. 3, Jun. 1980, p. 31.

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