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System, apparatus, and method for improving speech quality...

Electrical audio signal processing systems and devices – Binaural and stereophonic – Quadrasonic
Reexamination Certificate

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Three channel panning system

Electrical audio signal processing systems and devices – Binaural and stereophonic – Quadrasonic
Reexamination Certificate

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Universal four-channel surround sound speaker system for...

Electrical audio signal processing systems and devices – Binaural and stereophonic – Quadrasonic
Reexamination Certificate

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Variable matrix decoder

Electrical audio signal processing systems and devices – Binaural and stereophonic – Quadrasonic
Patent

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Variable matrix decoder

Electrical audio signal processing systems and devices – Binaural and stereophonic – Quadrasonic
Patent

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Variable matrix decoder for periphonic reproduction of sound

Electrical audio signal processing systems and devices – Binaural and stereophonic – Quadrasonic
Patent

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Variable matrix decoder with three output channels

Electrical audio signal processing systems and devices – Binaural and stereophonic – Quadrasonic
Patent

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Variable rate and variable limit dimension controls for a direct

Electrical audio signal processing systems and devices – Binaural and stereophonic – Quadrasonic
Patent

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