Folded column speaker enclosure
US4235301A · kind A · utility
Inventor
Key dates
| Filing date | Jun 4, 1979 |
| Grant date | Nov 25, 1980 |
| Priority date | — |
| Expiry date | Jun 4, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R1/2819
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
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 sh…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.