Electrical audio signal processing systems and devices – Including frequency control – Having crossover filter
Patent
1988-09-23
1990-01-30
Isen, Forester W.
Electrical audio signal processing systems and devices
Including frequency control
Having crossover filter
H03G 500
Patent
active
048978795
ABSTRACT:
A multi-way loudspeaker system comprising at least two series connected loudspeakers (Z.sub.H, Z.sub.L) connected to a common signal input (1, 2) for reproducing different parts of the full frequency spectrum of an audio signal applied to the signal input and being provided with a passive dividing network including a first impedance (Z.sub.1) connected in parallel to a first loudspeaker (Z.sub.H) for reproducing a first part of the audio-frequency spectrum and a second impedance (Z.sub.2) connected in parallel to a second loudspeaker (Z.sub.L) for reproducing a second part of the audio-frequency spectrum. The loudspeaker system is provided with a compensating circuit consisting of a transformer (T) and an impedance (Z.sub.N) connected in series with the primary winding and/or the secondary winding of the transformer for compensating the current flowing through one loudspeaker of the system and being fed thereto through the loudspeaker(s) being connected in series therewith so as to increase the slope of the attenuation characteristic of one section of the dividing network from its normal value of 6dB per octave to a value of 12dB per octave.
REFERENCES:
patent: 2084160 (1937-06-01), Minton et al.
patent: 2846503 (1958-08-01), Kump
patent: 3931469 (1976-01-01), Elliott et al.
patent: 4691362 (1987-09-01), Eberbach
Ashley, et al., "Active and Passive Filters as Loudspeaker Crossover Networks", J. Audio Eng. Society, vol. 19, No. 6, Jun. 1971, p. 498, rt. col.-p. 499.
Small, "Constant-Voltage Crossover Network Design", J. Audio Eng. Society, No. 19, No. 1, Jan. 1971, pp. 12-19.
"A Family of Linear-Phase Crossover Networks of High Slope Derived by Time Delay", J. Audio Eng. Society, vol. 31, No. 1/2, Jan./Feb. 1983, 2-19.
B & W Loudspeakers Limited
Isen Forester W.
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