Equalizing circuit for a loudspeaker system

Details Equalizing circuit for a loudspeaker system Equalizing circuit for a loudspeaker system

1994-04-29

1997-01-21

Cumming, William

Electrical audio signal processing systems and devices

Including frequency control

Having automatic equalizer circuit

381 96, 381 98, H03G 500

Patent

active

055966500

ABSTRACT:
The invention provides an equalizing circuit for a loudspeaker system. The circuit includes an output amplifier connected to the circuit output, and a feedback amplifier connected to the circuit input. A plurality of filter elements are connected in series to the output of the feedback amplifier and the outputs of each of the filter elements are connected to inputs of both the output amplifier and the feedback amplifier, the amplifier inputs defining scaling factors for achieving a desired target response function for the loudspeaker system. The circuit generates a circuit transfer function having a numerator and a denominator. The numerator defines sufficient zeroes for cancelling all poles of the known transfer function of the loudspeaker system. As a result, when the circuit is connected in cascade to the loudspeaker system, the desired response function can be obtained.

REFERENCES:
patent: 3755749 (1973-08-01), Van Ryswyk et al.
patent: 4458362 (1984-07-01), Berkovitz et al.
patent: 4468627 (1984-08-01), Fushiki
patent: 4481662 (1984-11-01), Long et al.
patent: 4888789 (1989-12-01), Orban
patent: 5117401 (1992-05-01), Feintuch
patent: 5384856 (1995-01-01), Kyouno et al.
The Mirror Filter--A New Basis for Reducing Nonlinear Distortion and Equalizing Response in Woofer Systems--By: Wolfgang Klippel J. Audio Eng. Soc., vol. 40 No. 9, 1992 Sep.

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