G - Physics – 10 – K
Patent
G - Physics
10
K
181/2
G10K 11/00 (2006.01) H04S 1/00 (2006.01)
Patent
CA 1195933
ABSTRACT Apparatus for reproducing sound having an expanded acous- tic image is used in a stereophonic sound reproduction system having a left channel output and a right channel output, which need not be binaural. A right main speaker and a left main speaker are disposed at right and left main speaker locations, respectively, which are equidistantly spaced from a listening location along a listening axis perpendicular to a line joining the left and right main speakers. The interaural time delay be- tween the ears of a listener at the listening location with re- spect to the main speakers is .DELTA.t. A first right sub-speaker and a first left sub-speaker are respectively disposed at right and left sub-speaker locations equidistantly spaced from the listen- ing location, and spaced such that sound from the sub-speakers as perceived by the ears of a listener is delayed as compared to sound from the main speakers by .DELTA.t. The left and right channel outputs are coupled to the left and right main speakers, respec- tively. Inverted left and right channel outputs are coupled to the first right and first left sub-speakers respectively. Ad- ditional sub-speakers can be provided for each channel and fed the same signals as the first sub-speakers. Alternatively, a second right sub-speaker and a second left sub speaker can be fed other signals, such as the left and right channel outputs, respectively. In one embodiment, the main and sub-speakers for each channel are respectively incorporated in a common enclosure to fix the spacing therebetween.
433998
Goudreau Gage Dubuc
Polk Audio Inc.
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