Acoustics – Anatomic or prosthetic relation – Ear and mouth
Patent
1978-11-08
1981-02-03
Olms, Douglas W.
Acoustics
Anatomic or prosthetic relation
Ear and mouth
181144, 179 1E, H04R 102
Patent
active
042490375
ABSTRACT:
A truncated, open top, pyramid housing is provided containing a downwardly propagating woofer mounted near the base of the pyramid; a forwardly and slightly upwardly propagating tweeter mounted on the front side of the pyramid; and a pair of rearwardly propagating, crossed polarity, mid-range speakers mounted on opposed sides of the pyramid housing. The push-pull propagation between the opposed mid-range speakers, within a single housing, and similar cooperation between stereo loudspeaker pairs, provides a generally phase distortion free, wide dispersion sound circulation. A polarity switch is provided for establishing the desired cross-phase relationship. The nonparallel side configuration of the housing reduces internal resonance by preventing standing wave formation. The open top functions as an unidirectional port which also reduces internal resonance. The upward portion of each sound cycle is guided out of the speaker housing towards the ceiling by the funneling action of the slanted, tapered sides. The return wave, however, is not guided back into the port, thus reducing the feedback energy required to support internal resonance. The housing may be packed with acoustical material to increase its effective acoustical volume.
REFERENCES:
patent: 3136383 (1964-06-01), Hopkins
patent: 3164676 (1965-01-01), Brunner
patent: 3326321 (1967-06-01), Valuch
patent: 3637938 (1972-01-01), Kuhlow
patent: 4006308 (1977-02-01), Ponsgen
patent: 4031318 (1977-06-01), Pitre
patent: 4051919 (1977-10-01), Buettner
Hentzel Paul
Olms Douglas W.
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