Acoustics – Anatomic or prosthetic relation – Ear and mouth
Patent
1978-04-25
1980-01-08
Stellar, George G.
Acoustics
Anatomic or prosthetic relation
Ear and mouth
181144, 181155, H04R 126
Patent
active
041829310
ABSTRACT:
A 360 degree, in-phase audio propagation system utilizating sound propagation in conjunction with various types of active reflectors. In a first embodiment two bass speakers or woofers are mounted in an air-tight casing, the first speaker being mounted internal to the casing and facing outwardly through an aperture, the second speaker being mounted colinear with the first speaker. The casing is supported so that the first speaker is spaced from the floor facing downwardly whereby sound is reflected in a 360 degree pattern from the floor. The two speakers are driven out of phase with each other so that air within the chamber is alternately compressed and rarefied in accordance with a speaker driving signal, thereby preventing either speaker from resonating or overreacting to the driving signal. Sound from the front of the first speaker combines with and is reinforced by sound from the back of the second speaker thereby providing essentially a 360 degree propagation pattern. In one embodiment the second speaker is mounted so as to face the back side of the first speaker. In a further embodiment two dome-type speakers face each other and are spaced a predetermined distance apart. The compressed and rarefied air created by the speaker surfaces interreacts so that sound energy is propagated laterally or normally with respect to the longitudinal axes of the speakers, thereby providing a 360 degree, in-phase propagation pattern having clarity and imaging characteristics heretofore unobtainable by conventional systems. Also, there is found a greater vertical dispersion of the higher frequencies as the confronting dome surfaces of the drivers approach, or contact, one another.
REFERENCES:
patent: 1820956 (1931-09-01), Von Arco
patent: 2832843 (1958-04-01), Miessner
patent: 3076520 (1963-02-01), Farwell
patent: 3393764 (1968-07-01), Schafer
patent: 3866710 (1975-02-01), Cesati
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