Dihedral loudspeakers with variable dispersion circuits

Electrical audio signal processing systems and devices – Including frequency control – Having crossover filter

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381 24, H03G 500

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active

046913629

ABSTRACT:
A dihedral loudspeaker for use in mirror image stereophonic loudspeaker systems combines a pair of coaxial drivers with variable dispersion circuits and a high frequency delay network. The variable dispersion circuits decrease the amplitude of the electric signal to the indirect or ambient firing coaxial drivers relative to the direct firing drivers. Each coaxial driver combination comprises a high frequency driver in front of a low or mid-range frequency driver. The pair of coaxial driver combinations in each loudspeaker are substantially identical and each is effectively almost a point source of sound energy. The pair of coaxial drivers are located in dihedral baffles of the loudspeaker approximately the interaural distance apart. The variable dispersion circuits allow the loudspeakers to be adjusted such that listeners outside of the area between and in front of the loudspeakers hear an illusion of the sound image coming from the space between the loudspeakers.

REFERENCES:
patent: 4037051 (1977-07-01), Fuselier
patent: 4074070 (1978-02-01), Gaus
patent: 4218583 (1980-08-01), Poulo
patent: 4220832 (1980-09-01), Nagel
patent: 4227050 (1980-10-01), Wilson
patent: 4578809 (1986-03-01), Eberbach

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