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In-home theater surround sound speaker system
| Details |
Inventors: Ruzicka, Jerome E.;
Assignee: REP Investment Limited Liability (Grand Rapids, MI)
Primary Examiner: Chang; Vivian
Assistant Examiner:
Attorney, Agent or Firm: Harness, Dickey & Pierce, P.L.C.
An apparatus for realistically reproducing sound, particularly for sound based on a stereophonic signal having dialog and effects and associated with an accompanying video image. The apparatus includes a front speaker located in proximity to the video image for providing acoustic output based upon a summation signal of the component left and right (L+R) channels of the audio signal. A rear speaker located to the rear of the viewing area provides acoustic output based upon a difference signal, (L-R) or (R-L), between the left and right channels. Left and right speakers located to the respective left and right sides of the viewing area. The left and right channels speakers reproduce in one embodiment the respective left and right channels of the audio signal and in a second embodiment reproduce a difference signal, (L-.beta.R) or (R-.beta.L), where .beta. is a gain which may vary or may be a value fixed between zero and unity. Output to the left and right speakers is band limited to substantially filter out frequency components below a predetermined threshold. A bass speaker may also be provided to output the low frequency components of a (L+R) summation signal. The (L+R) summation signal input to the front speaker assists in localizing dialog to the video image. The (L-.beta.R) or (R-.beta.L) difference signal substantially removes dialog sound so that the side and rear speaker output primarily comprises sonic ambience and surround sound effects. Band limiting the left and right speakers further assists in localizing dialog to the video image. Alternatively, in yet another embodiment, a monophonic signal may be applied to at least one embodiment of the system to enable production of a spatially enhanced surround sound effect. |
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DETAILED DESCRIPTION In accordance with the principles of the present invention, a home theater surround sound speaker system reproduces in a novel manner the stereophonic audio portion of an audio/video presentation so that dialog is localized to the video image and the viewer is immersed in a sound field perceived as authentic in relation to the visual image.
In a first preferred embodiment of the present invention, the passive, unpowered speaker system includes a front speaker, a left speaker, a right speaker, and a rear speaker, each speaker receiving an electrical input signal and providing an acoustic output in accordance with the electrical input signal.
The front speaker is located in proximity to the video image and provides an acoustic output in accordance with a left plus right (L+R) summation of the left and right channels of the stereophonic signal, so that dialog localizes to and coincides with the video image.
The right and left speakers may be co-planer with the front speaker, but preferably are located between the viewer and the front speaker, and to the left and the right sides of the viewing area, respectively.
The speakers provide acoustic output in accordance with the respective left and right stereophonic channels.
The rear speaker is located to the rear of the viewing area and provides acoustic output in accordance with a left minus right (L-R) or right minus left (R-L) difference between the stereophonic channel signals.
The difference signal substantially filters out dialog and provides the ambience and surround sound audio information.
The left and right channel electrical signal inputs to the respective left and right speakers are band limited to substantially remove all frequency components below a predetermined threshold frequency.
Band limiting insures that dialog is localized to the front speaker, as the filtering substantially removes signal energy in the speech signal range from the left and right channel signals being acoustically reproduced.
In a second preferred embodiment, the passive, unpowered speaker system includes a front speaker, a left speaker, a right speaker, and a rear speaker, each speaker receiving an electrical input signal and providing an acoustic output in accordance with the electrical input signal
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