Electrical audio signal processing systems and devices – Binaural and stereophonic – Hearing aid
Patent
1984-06-01
1986-02-04
Isen, Forester W.
Electrical audio signal processing systems and devices
Binaural and stereophonic
Hearing aid
381 1, 381 99, H04R 500
Patent
active
045690740
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 sub-speaker includes a driver and a tweeter, with the driver spaced a distance approximately 50% further from the main speaker location than the tweeter. 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: 4058675 (1977-11-01), Kobayashi et al.
patent: 4199658 (1980-04-01), Iwahara
patent: 4219696 (1980-08-01), Kogure et al.
patent: 4308423 (1981-12-01), Cohen
patent: 4355203 (1982-10-01), Cohen
patent: 4524451 (1985-06-01), Watanabe
Isen Forester W.
Polk Audio Inc.
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