Electrical audio signal processing systems and devices – Having non-electrical feature – Loudspeakers driven in given phase relationship
Patent
1994-11-30
1998-03-31
Kuntz, Curtis
Electrical audio signal processing systems and devices
Having non-electrical feature
Loudspeakers driven in given phase relationship
381159, 381160, 381154, 181148, 181153, 181155, 181156, 330105, 330129, 330279, H04R 102
Patent
active
057347280
ABSTRACT:
A speaker system includes a vertically oriented elongated tube supported on a ground surface, and open at upper and lower ends thereof; a woofer, mid-range speaker and tweeter mounted at a lower end of the tube, the woofer having a front driving face with an effective driving area, the woofer providing an in-phase audio signal directed upwardly through the tube and an out-of-phase ground wave audio signal directed in an opposite direction therefrom; an enclosure enclosing the woofer and mounting the tube on the ground surface; a restricted open area formed between a lower edge of the enclosure and the ground surface and being less than the effective driving area, the restricted open area being arranged to transmit the out-of-phase ground wave audio signal from the woofer in a direction transverse to the axial direction; and a driving circuit for driving the woofer and including a power amplifier for amplifying an input signal with a variable gain and supplying the amplified input signal to the woofer, a circuit for measuring the impedance of the woofer, including a resistor monitoring a current of the amplified input signal supplied to the speaker, and a circuit for varying the gain of the first power amplifier in dependence upon the measured impedance of the woofer, so as to increase the gain of the power amplifier primarily for low frequency components of the input signal in response to the monitored current by the resistor.
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"Bose, Professional Wave Systems", date unknown.
Goldberg Richard M.
Kuntz Curtis
Nguyen Duc
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