Method and apparatus for reproducing sound having a realistic am

Details Method and apparatus for reproducing sound having a realistic am Method and apparatus for reproducing sound having a realistic am

1985-05-30

1986-12-16

Isen, Forester W.

Electrical audio signal processing systems and devices

Binaural and stereophonic

381 24, H04R 500

Patent

active

046302980

ABSTRACT:
Apparatus for reproducing sound having a realistic ambient field and acoustic image is used in a stereophonic sound reproduction system having a left channel output and a right channel output. 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. A right sub-speaker and a left sub-speaker are respectively disposed at right and left sub-speaker locations equidistantly spaced from the listening location, and further from the listening location than the main speaker. In one particular arrangement each main speaker includes a driver and a tweeter and each sub-speaker includes only a driver. The left and right channel outputs are respectively coupled to the left and right main speakers. A left channel minus right channel difference signal is coupled to the left sub-speaker and a right channel minus left channel difference signal is coupled to the right sub-speaker. In one embodiment, the main and sub-speakers for each channel are respectively incorporated in a common enclosure to fix the spacing therebetween. A technique for determining optimal spacing between the main and sub-speakers and between the various speakers and the listening location is set forth.

REFERENCES:
patent: 4308423 (1981-12-01), Cohen
patent: 4355203 (1982-10-01), Cohen
patent: 4489432 (1984-12-01), Polk
patent: 4497064 (1985-01-01), Polk
patent: 4569074 (1986-02-01), Polk

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