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Sound field variable apparatus
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Patent number 5,233,661
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Issue date Aug 3, 1993
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Matsushita Electric Industrial Co., Ltd.
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Akihisa Kawamura
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Sound field control system
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Patent number 5,123,050
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Issue date Jun 16, 1992
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Matsushita Electric Industrial Co., Ltd.
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Mitsuhiko Serikawa
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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Sound field control apparatus
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Patent number 5,073,942
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Issue date Dec 17, 1991
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Matsushita Electric Industrial Co., Ltd.
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Hiroko Yoshida
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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