Electrical audio signal processing systems and devices – Including frequency control – Having automatic equalizer circuit
Patent
1985-03-25
1987-04-28
Isen, Forester W.
Electrical audio signal processing systems and devices
Including frequency control
Having automatic equalizer circuit
381 98, H03G 500
Patent
active
046619828
ABSTRACT:
A digital graphic equalizer includes a pulse-sequence generator for generating a sequence of pulse signals, a first digital signal processor for filtering the pulse signals to produce a filtered signal, a digital-to-analog converter responsive to the filtered signal for producing a calibrating signal, and a loudspeaker responsive to the calibrating signal for propagating a calibrating sound in a listening environment, the frequency characteristics of the calibrating sound being subject to modification by the listening environment. A detector detects the calibrating sound as propagated in the listening environment and produces a detection signal representative thereof. An analog-to-digital converter is responsive to the detection signal for producing a digital signal corresponding thereto, and a second digital signal processor is responsive to the digital signal for producing a plurality of frequency-divided signals. A spectrum analyzer is responsive to the frequency-divided signals for analyzing the frequency characteristics of the calibrating sound as propagated in the listening environment and producing a compensating signal adapted to compensate for the modification by the listening environment of the frequency characteristics of the calibrating sound.
REFERENCES:
patent: 4340780 (1982-07-01), Odlen
patent: 4458362 (1984-07-01), Berkovitz et al.
Lancaster, TTL Cookbook, 1980, pp. 280-282.
Chamberlin, Musical Applications of Microprocessors, 1980, pp. 309, 446, 447.
Hamada Osamu
Kitazato Naohisa
Eslinger Lewis H.
Isen Forester W.
Sinderbrand Alvin
Sony Corporation
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