Notebook computer speakers

Details Notebook computer speakers Notebook computer speakers

1996-04-25

1997-09-16

Oh, Minsun

Electrical audio signal processing systems and devices

Binaural and stereophonic

Hearing aid

381 88, 381159, 381182, H04R 500

Patent

active

056688822

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.

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Acoustics, Leo L. Beranek, Massachusetts Institute Of Technology, Copyright 1954, 1986, 1990, and 1993, p. 93.
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Loudspeakers In Vented Boxes: Part 1, A. N. Thiele, Journal Of The Audio Engineering Society, May 1971, vol. 19, No. 5, pp. 382-392.
Loudspeakers In Vented Boxes: Part II, A. N. Thiele, Journal Of The Audio Engineering Society, Jun. 1971, vol. 19, No. 6, pp. 471-483.

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