Notebook computer speakers
US5668882A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 25, 1996 |
| Grant date | Sep 16, 1997 |
| Priority date | — |
| Expiry date | Apr 25, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R5/02
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A loudspeaker configuration for a notebook computer includes one or more high frequency "upper" speakers and a low frequency "lower" speaker. The upper speakers are mounted within a display housing and emit sounds over a range including directional sounds having wavelengths less than one-third the upper speaker diameter. The "lower" speaker is mounted within a keyboard housing. The lower speaker is oriented downward onto the desktop or other support surface and displaces a larger volume of air than the upper speaker. Open space between a processor board and a lower housing base surface define an internal speaker-box chamber for the lower speaker. The housing base surface and a support surface for the computer defining an external speaker box for the lower speaker. The internal speaker box and external speaker box define a band pass acoustic filter for sound waves emitted from the second speaker. The sound waves passing through the band pass filter occur to a listener as non-directional sound. The directional high frequency sounds emitted from the upper speaker(s) are enriched with the non-directional sounds of the upper and lower speakers, resulting in improved sound quality.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.