Electrical audio signal processing systems and devices – Binaural and stereophonic – Quadrasonic
Patent
1993-01-14
1994-07-26
Isen, Forester W.
Electrical audio signal processing systems and devices
Binaural and stereophonic
Quadrasonic
H04S 300
Patent
active
053332016
ABSTRACT:
An audio sound system decodes from non-encoded two-channel stereo into at least four channel sound. The rear channel information is derived by taking a difference of left minus right and dividing that difference into a plurality of bands. In a simplistic implementation, at least one band is dynamically steered while the other band is unaltered so as to avoid any perceived pumping effects while providing transient information to left/right, as well as directional enhancement. In a preferred embodiment, multiple bands are dynamically steered left or right, so as to enhance directional information to the rear of the listener. In both schemes, the low pass filtered output of the sum of the left and right inputs is also combined with the directionally enhanced information, so as to provide a composite left rear and right rear output. Furthermore, the center channel information does not necessarily require a discrete loudspeaker, and can be divided so that low frequency information can be applied to the rear channels while mid and high frequency information from the center channel can be applied to the front left and right channels to compensate for any perceived loss of center information.
REFERENCES:
patent: 4680796 (1987-07-01), Blackmer et al.
patent: 5216718 (1993-06-01), Fukuda
Isen Forester W.
Rocktron Corporation
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