Acoustics – Diaphragm and enclosure
Patent
1979-06-04
1980-11-25
Wintercorn, Richard A.
Acoustics
Diaphragm and enclosure
181152, 181156, 181199, H05K 500
Patent
active
042353017
ABSTRACT:
A loudspeaker enclosure for housing a basic speaker and providing a conduit for channeling the sound waves emitted from the back surface of the basic speaker so that the sound waves are shifted in phase and emerge from a port in the enclosure and add to, rather than acoustically cancel, the sound waves emitted from the front surface of the basic speaker. The sound waves from the back surface of the speaker travel through the length of the conduit which is folded through several 45.degree. angles upon itself. These sound waves are directed through the conduit by striking and reflecting from a plurality of at least six reflector panels which are mounted at 45.degree. angles. In this manner, due to the nature of reflections at 45.degree. angles, each portion of a sound wave impulse travels the same distance as each other portion and the impulse emerges from the port basically intact. The enclosure has a unique shape because of the several foldings of the conduit through 45.degree. angles. This unique shape enables the enclosure to comprise significantly less volume than a comparable conventional column enclosure necessary to obtain the same degree of sound wave phase shifting. This shape also enables the listener to position one or more such enclosures in numerous attitudes and configurations according to the listener's preferences in room decor and in sound blend and coverage.
REFERENCES:
patent: 2476572 (1949-07-01), Wenzel
patent: 2491982 (1949-12-01), Kincart
patent: 2646852 (1953-07-01), Forrester
patent: 2822884 (1958-02-01), Simpson
patent: 3186509 (1965-06-01), Dudognon
patent: 3235028 (1966-02-01), Quinion
patent: 3241631 (1966-03-01), Manieri
patent: 3608665 (1971-09-01), Drisi
patent: 3627948 (1971-12-01), Nichols
patent: 3816672 (1974-06-01), Gejvert et al.
patent: 4168761 (1979-09-01), Pappanikolson
A. R. Bailey, "The Transmission-line Loudspeaker Enclosure", Wireless World 215 (May 1972).
G. L. Augspurger, "Column Loudspeaker Systems", Electronics World 25 (Jun. 1963).
Fuller Benjamin R.
Wintercorn Richard A.
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