The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 25, 1980
Filed:
Jun. 04, 1979
Robert W Mitchell, Saint Joseph, MI (US);
Other;
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.